Config - access Perl configuration information

    use Config;
    if ($Config{usethreads}) {
        print "has thread support\n"
    }

    use Config qw(myconfig config_sh config_vars config_re);

    print myconfig();

    print config_sh();

    print config_re();

    config_vars(qw(osname archname));

The Config module contains all the information that was available to the CWConfigure program at Perl build time (over 900 values).

Shell variables from the config.sh file (written by Configure) are stored in the readonly-variable CW%Config, indexed by their names.

Values stored in config.sh as 'undef' are returned as undefined values. The perl CWexists function can be used to check if a named variable exists.

myconfig()

Returns a textual summary of the major perl configuration values. See also CW-V in Switches in perlrun.

config_sh()

Returns the entire perl configuration information in the form of the original config.sh shell variable assignment script.

config_re($regex)

Like config_sh() but returns, as a list, only the config entries who's names match the CW$regex.

config_vars(@names)

Prints to STDOUT the values of the named configuration variable. Each is printed on a separate line in the form:

  name='value';

Names which are unknown are output as CWname='UNKNOWN';. See also CW-V:name in Switches in perlrun.

Here's a more sophisticated example of using CW%Config:

    use Config;
    use strict;

    my %sig_num;
    my @sig_name;
    unless($Config{sig_name} && $Config{sig_num}) {
        die "No sigs?";
    } else {
        my @names = split ' ', $Config{sig_name};
        @sig_num{@names} = split ' ', $Config{sig_num};
        foreach (@names) {
            $sig_name[$sig_num{$_}] ||= $_;
        }   
    }

    print "signal #17 = $sig_name[17]\n";
    if ($sig_num{ALRM}) { 
        print "SIGALRM is $sig_num{ALRM}\n";
    }

Because this information is not stored within the perl executable itself it is possible (but unlikely) that the information does not relate to the actual perl binary which is being used to access it.

The Config module is installed into the architecture and version specific library directory ($Config{installarchlib}) and it checks the perl version number when loaded.

The values stored in config.sh may be either single-quoted or double-quoted. Double-quoted strings are handy for those cases where you need to include escape sequences in the strings. To avoid runtime variable interpolation, any CW$ and CW@ characters are replaced by CW\$ and CW\@, respectively. This isn't foolproof, of course, so don't embed CW\$ or CW\@ in double-quoted strings unless you're willing to deal with the consequences. (The slashes will end up escaped and the CW$ or CW@ will trigger variable interpolation)

Most CWConfig variables are determined by the CWConfigure script on platforms supported by it (which is most UNIX platforms). Some platforms have custom-made CWConfig variables, and may thus not have some of the variables described below, or may have extraneous variables specific to that particular port. See the port specific documentation in such cases.

From Unix.U: This variable defines the extension used for ordinary library files. For unix, it is .a. The . is included. Other possible values include .lib. From Unix.U: This variable defines the extension used for executable files. CWDJGPP, Cygwin and OS/2 use .exe. Stratus CWVOS uses .pm. On operating systems which do not require a specific extension for executable files, this variable is empty. From Unix.U: This variable defines the extension used for object files. For unix, it is .o. The . is included. Other possible values include .obj.

From afs.U: This variable is set to CWtrue if CWAFS (Andrew File System) is used on the system, CWfalse otherwise. It is possible to override this with a hint value or command line option, but you'd better know what you are doing. From afs.U: This variable is by default set to /afs. In the unlikely case this is not the correct root, it is possible to override this with a hint value or command line option. This will be used in subsequent tests for AFSness in the Perl configure and test process. From alignbytes.U: This variable holds the number of bytes required to align a double or a long double when applicable. Usual values are 2, 4 and 8. The default is eight, for safety. From ansi2knr.U: This variable is set if the user needs to run ansi2knr. Currently, this is not supported, so we just abort. From d_gethname.U: This variable contains the command which can be used to compute the host name. The command is fully qualified by its absolute path, to make it safe when used by a process with super-user privileges. From patchlevel.U: The three variables, api_revision, api_version, and api_subversion, specify the version of the oldest perl binary compatible with the present perl. In a full version string such as 5.6.1, api_revision is the CW5. Prior to 5.5.640, the format was a floating point number, like 5.00563. perl.c:incpush() and lib/lib.pm will automatically search in $sitelib/.. for older directories back to the limit specified by these api_ variables. This is only useful if you have a perl library directory tree structured like the default one. See CWINSTALL for how this works. The versioned site_perl directory was introduced in 5.005, so that is the lowest possible value. The version list appropriate for the current system is determined in inc_version_list.U. CWXXX To do: Since compatibility can depend on compile time options (such as bincompat, longlong, etc.) it should (perhaps) be set by Configure, but currently it isn't. Currently, we read a hard-wired value from patchlevel.h. Perhaps what we ought to do is take the hard-wired value from patchlevel.h but then modify it if the current Configure options warrant. patchlevel.h then would use an #ifdef guard. From patchlevel.U: The three variables, api_revision, api_version, and api_subversion, specify the version of the oldest perl binary compatible with the present perl. In a full version string such as 5.6.1, api_subversion is the CW1. See api_revision for full details. From patchlevel.U: The three variables, api_revision, api_version, and api_subversion, specify the version of the oldest perl binary compatible with the present perl. In a full version string such as 5.6.1, api_version is the CW6. See api_revision for full details. As a special case, 5.5.0 is rendered in the old-style as 5.005. (In the 5.005_0x maintenance series, this was the only versioned directory in CW$sitelib.) From patchlevel.U: This variable combines api_revision, api_version, and api_subversion in a format such as 5.6.1 (or 5_6_1) suitable for use as a directory name. This is filesystem dependent. From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the ar program. After Configure runs, the value is reset to a plain CWar and is not useful. From archlib.U: This variable holds the name of the directory in which the user wants to put architecture-dependent public library files for CW$package. It is most often a local directory such as /usr/local/lib. Programs using this variable must be prepared to deal with filename expansion. From archlib.U: This variable is the same as the archlib variable, but is filename expanded at configuration time, for convenient use. From use64bits.U: This variable is used for the 64-bitness part of CW$archname. From archname.U: This variable is a short name to characterize the current architecture. It is used mainly to construct the default archlib. From Unix.U: This variable defines any additional objects that must be linked in with the program on this architecture. On unix, it is usually empty. It is typically used to include emulations of unix calls or other facilities. For perl on OS/2, for example, this would include os2/os2.obj. From d_asctime_r.U: This variable encodes the prototype of asctime_r. It is zero if d_asctime_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_asctime_r is defined. From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the awk program. After Configure runs, the value is reset to a plain CWawk and is not useful.

From baserev.U: The base revision level of this package, from the .package file. From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful. From bin.U: This variable holds the name of the directory in which the user wants to put publicly executable images for the package in question. It is most often a local directory such as /usr/local/bin. Programs using this variable must be prepared to deal with ~name substitution. From bin.U: This is the same as the bin variable, but is filename expanded at configuration time, for use in your makefiles. From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the bison program. After Configure runs, the value is reset to a plain CWbison and is not useful. From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the byacc program. After Configure runs, the value is reset to a plain CWbyacc and is not useful. From byteorder.U: This variable holds the byte order in a CWUV. In the following, larger digits indicate more significance. The variable byteorder is either 4321 on a big-endian machine, or 1234 on a little-endian, or 87654321 on a Cray ... or 3412 with weird order !

From n.U: This variable contains the \c string if that is what causes the echo command to suppress newline. Otherwise it is null. Correct usage is CW$echo CW$n prompt for a question: CW$c. From d_castneg.U: This variable contains a flag that precise difficulties the compiler has casting odd floating values to unsigned long: 0 = ok 1 = couldn't cast < 0 2 = couldn't cast >= 0x80000000 4 = couldn't cast in argument expression list From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the cat program. After Configure runs, the value is reset to a plain CWcat and is not useful. From cc.U: This variable holds the name of a command to execute a C compiler which can resolve multiple global references that happen to have the same name. Usual values are CWcc and CWgcc. Fervent CWANSI compilers may be called CWc89. CWAIX has xlc. From dlsrc.U: This variable contains any special flags that might need to be passed with CWcc -c to compile modules to be used to create a shared library that will be used for dynamic loading. For hpux, this should be +z. It is up to the makefile to use it. From dlsrc.U: This variable contains any special flags that might need to be passed to cc to link with a shared library for dynamic loading. It is up to the makefile to use it. For sunos 4.1, it should be empty. From ccflags.U: This variable contains any additional C compiler flags desired by the user. It is up to the Makefile to use this. From uselfs.U: This variable contains the compiler flags needed by large file builds and added to ccflags by hints files. From Checkcc.U: This can set either by hints files or by Configure. If using gcc, this is gcc, and if not, usually equal to cc, unimpressive, no? Some platforms, however, make good use of this by storing the flavor of the C compiler being used here. For example if using the Sun WorkShop suite, ccname will be CWworkshop. From Cppsym.U: The variable contains the symbols defined by the C compiler alone. The symbols defined by cpp or by cc when it calls cpp are not in this list, see cppsymbols and cppccsymbols. The list is a space-separated list of symbol=value tokens. From Checkcc.U: This can set either by hints files or by Configure. If using a (non-gcc) vendor cc, this variable may contain a version for the compiler. From cf_who.U: Login name of the person who ran the Configure script and answered the questions. This is used to tag both config.sh and config_h.SH. From cf_email.U: Electronic mail address of the person who ran Configure. This can be used by units that require the user's e-mail, like MailList.U. From cf_who.U: Holds the output of the CWdate command when the configuration file was produced. This is used to tag both config.sh and config_h.SH. From charsize.U: This variable contains the value of the CWCHARSIZE symbol, which indicates to the C program how many bytes there are in a character. From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful. From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the chmod program. After Configure runs, the value is reset to a plain CWchmod and is not useful. From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful. From d_times.U: This variable holds the type returned by times(). It can be long, or clock_t on CWBSD sites (in which case <sys/types.h> should be included). From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the comm program. After Configure runs, the value is reset to a plain CWcomm and is not useful. From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful. From contains.U: This variable holds the command to do a grep with a proper return status. On most sane systems it is simply CWgrep. On insane systems it is a grep followed by a cat followed by a test. This variable is primarily for the use of other Configure units. From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the cp program. After Configure runs, the value is reset to a plain CWcp and is not useful. From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful. From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the cpp program. After Configure runs, the value is reset to a plain CWcpp and is not useful. From cpp_stuff.U: This variable contains an identification of the concatenation mechanism used by the C preprocessor. From Cppsym.U: The variable contains the symbols defined by the C compiler when it calls cpp. The symbols defined by the cc alone or cpp alone are not in this list, see ccsymbols and cppsymbols. The list is a space-separated list of symbol=value tokens. From ccflags.U: This variable holds the flags that will be passed to the C pre- processor. It is up to the Makefile to use it. From cppstdin.U: This variable has the same functionality as cppminus, only it applies to cpprun and not cppstdin. From cppstdin.U: This variable contains the second part of the string which will invoke the C preprocessor on the standard input and produce to standard output. This variable will have the value CW- if cppstdin needs a minus to specify standard input, otherwise the value is "". From cppstdin.U: This variable contains the command which will invoke a C preprocessor on standard input and put the output to stdout. It is guaranteed not to be a wrapper and may be a null string if no preprocessor can be made directly available. This preprocessor might be different from the one used by the C compiler. Don't forget to append cpplast after the preprocessor options. From cppstdin.U: This variable contains the command which will invoke the C preprocessor on standard input and put the output to stdout. It is primarily used by other Configure units that ask about preprocessor symbols. From Cppsym.U: The variable contains the symbols defined by the C preprocessor alone. The symbols defined by cc or by cc when it calls cpp are not in this list, see ccsymbols and cppccsymbols. The list is a space-separated list of symbol=value tokens. From d_crypt_r.U: This variable encodes the prototype of crypt_r. It is zero if d_crypt_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_crypt_r is defined. From d_crypt.U: This variable holds -lcrypt or the path to a libcrypt.a archive if the crypt() function is not defined in the standard C library. It is up to the Makefile to use this. From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the csh program. After Configure runs, the value is reset to a plain CWcsh and is not useful. From d_ctermid_r.U: This variable encodes the prototype of ctermid_r. It is zero if d_ctermid_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_ctermid_r is defined. From d_ctime_r.U: This variable encodes the prototype of ctime_r. It is zero if d_ctime_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_ctime_r is defined.

From d__fwalk.U: This variable conditionally defines CWHAS__FWALK if _fwalk() is available to apply a function to all the file handles. From d_access.U: This variable conditionally defines CWHAS_ACCESS if the access() system call is available to check for access permissions using real IDs. From d_accessx.U: This variable conditionally defines the CWHAS_ACCESSX symbol, which indicates to the C program that the accessx() routine is available. From d_aintl.U: This variable conditionally defines the CWHAS_AINTL symbol, which indicates to the C program that the aintl() routine is available. If copysignl is also present we can emulate modfl. From d_alarm.U: This variable conditionally defines the CWHAS_ALARM symbol, which indicates to the C program that the alarm() routine is available. From archlib.U: This variable conditionally defines CWARCHLIB to hold the pathname of architecture-dependent library files for CW$package. If CW$archlib is the same as CW$privlib, then this is set to undef. From d_asctime_r.U: This variable conditionally defines the CWHAS_ASCTIME_R symbol, which indicates to the C program that the asctime_r() routine is available. From atolf.U: This variable conditionally defines the CWHAS_ATOLF symbol, which indicates to the C program that the atolf() routine is available. From atoll.U: This variable conditionally defines the CWHAS_ATOLL symbol, which indicates to the C program that the atoll() routine is available. From d_attribut.U: This variable conditionally defines CWHASATTRIBUTE, which indicates the C compiler can check for function attributes, such as printf formats. From d_bcmp.U: This variable conditionally defines the CWHAS_BCMP symbol if the bcmp() routine is available to compare strings. From d_bcopy.U: This variable conditionally defines the CWHAS_BCOPY symbol if the bcopy() routine is available to copy strings. From Guess.U: This symbol conditionally defines the symbol CWBSD when running on a CWBSD system. From d_getpgrp.U: This variable conditionally defines CWUSE_BSD_GETPGRP if getpgrp needs one arguments whereas CWUSG one needs none. From d_setpgrp.U: This variable conditionally defines CWUSE_BSD_SETPGRP if setpgrp needs two arguments whereas CWUSG one needs none. See also d_setpgid for a CWPOSIX interface. From d_bzero.U: This variable conditionally defines the CWHAS_BZERO symbol if the bzero() routine is available to set memory to 0. From d_casti32.U: This variable conditionally defines CASTI32, which indicates whether the C compiler can cast large floats to 32-bit ints. From d_castneg.U: This variable conditionally defines CWCASTNEG, which indicates wether the C compiler can cast negative float to unsigned. From d_vprintf.U: This variable conditionally defines CWCHARVSPRINTF if this system has vsprintf returning type (char*). The trend seems to be to declare it as int vsprintf(). From d_chown.U: This variable conditionally defines the CWHAS_CHOWN symbol, which indicates to the C program that the chown() routine is available. From d_chroot.U: This variable conditionally defines the CWHAS_CHROOT symbol, which indicates to the C program that the chroot() routine is available. From d_chsize.U: This variable conditionally defines the CWCHSIZE symbol, which indicates to the C program that the chsize() routine is available to truncate files. You might need a -lx to get this routine. From d_class.U: This variable conditionally defines the CWHAS_CLASS symbol, which indicates to the C program that the class() routine is available. From d_closedir.U: This variable conditionally defines CWHAS_CLOSEDIR if closedir() is available. From d_cmsghdr_s.U: This variable conditionally defines the CWHAS_STRUCT_CMSGHDR symbol, which indicates that the struct cmsghdr is supported. From d_const.U: This variable conditionally defines the CWHASCONST symbol, which indicates to the C program that this C compiler knows about the const type. From d_copysignl.U: This variable conditionally defines the CWHAS_COPYSIGNL symbol, which indicates to the C program that the copysignl() routine is available. If aintl is also present we can emulate modfl. From d_crypt.U: This variable conditionally defines the CWCRYPT symbol, which indicates to the C program that the crypt() routine is available to encrypt passwords and the like. From d_crypt_r.U: This variable conditionally defines the CWHAS_CRYPT_R symbol, which indicates to the C program that the crypt_r() routine is available. From d_csh.U: This variable conditionally defines the CWCSH symbol, which indicates to the C program that the C-shell exists. From d_ctermid_r.U: This variable conditionally defines the CWHAS_CTERMID_R symbol, which indicates to the C program that the ctermid_r() routine is available. From d_ctime_r.U: This variable conditionally defines the CWHAS_CTIME_R symbol, which indicates to the C program that the ctime_r() routine is available. From d_cuserid.U: This variable conditionally defines the CWHAS_CUSERID symbol, which indicates to the C program that the cuserid() routine is available to get character login names. From d_dbl_dig.U: This variable conditionally defines d_dbl_dig if this system's header files provide CWDBL_DIG, which is the number of significant digits in a double precision number. From d_dbminitproto.U: This variable conditionally defines the CWHAS_DBMINIT_PROTO symbol, which indicates to the C program that the system provides a prototype for the dbminit() function. Otherwise, it is up to the program to supply one. From d_difftime.U: This variable conditionally defines the CWHAS_DIFFTIME symbol, which indicates to the C program that the difftime() routine is available. From d_dirfd.U: This variable conditionally defines the CWHAS_DIRFD constant, which indicates to the C program that dirfd() is available to return the file descriptor of a directory stream. From i_dirent.U: This variable conditionally defines CWDIRNAMLEN, which indicates to the C program that the length of directory entry names is provided by a d_namelen field. From d_dlerror.U: This variable conditionally defines the CWHAS_DLERROR symbol, which indicates to the C program that the dlerror() routine is available. From d_dlopen.U: This variable conditionally defines the CWHAS_DLOPEN symbol, which indicates to the C program that the dlopen() routine is available. From d_dlsymun.U: This variable conditionally defines CWDLSYM_NEEDS_UNDERSCORE, which indicates that we need to prepend an underscore to the symbol name before calling dlsym(). From d_dosuid.U: This variable conditionally defines the symbol CWDOSUID, which tells the C program that it should insert setuid emulation code on hosts which have setuid #! scripts disabled. From d_drand48_r.U: This variable conditionally defines the HAS_DRAND48_R symbol, which indicates to the C program that the drand48_r() routine is available. From d_drand48proto.U: This variable conditionally defines the HAS_DRAND48_PROTO symbol, which indicates to the C program that the system provides a prototype for the drand48() function. Otherwise, it is up to the program to supply one. From d_dup2.U: This variable conditionally defines HAS_DUP2 if dup2() is available to duplicate file descriptors. From d_eaccess.U: This variable conditionally defines the CWHAS_EACCESS symbol, which indicates to the C program that the eaccess() routine is available. From d_endgrent.U: This variable conditionally defines the CWHAS_ENDGRENT symbol, which indicates to the C program that the endgrent() routine is available for sequential access of the group database. From d_endgrent_r.U: This variable conditionally defines the CWHAS_ENDGRENT_R symbol, which indicates to the C program that the endgrent_r() routine is available. From d_endhent.U: This variable conditionally defines CWHAS_ENDHOSTENT if endhostent() is available to close whatever was being used for host queries. From d_endhostent_r.U: This variable conditionally defines the CWHAS_ENDHOSTENT_R symbol, which indicates to the C program that the endhostent_r() routine is available. From d_endnent.U: This variable conditionally defines CWHAS_ENDNETENT if endnetent() is available to close whatever was being used for network queries. From d_endnetent_r.U: This variable conditionally defines the CWHAS_ENDNETENT_R symbol, which indicates to the C program that the endnetent_r() routine is available. From d_endpent.U: This variable conditionally defines CWHAS_ENDPROTOENT if endprotoent() is available to close whatever was being used for protocol queries. From d_endprotoent_r.U: This variable conditionally defines the CWHAS_ENDPROTOENT_R symbol, which indicates to the C program that the endprotoent_r() routine is available. From d_endpwent.U: This variable conditionally defines the CWHAS_ENDPWENT symbol, which indicates to the C program that the endpwent() routine is available for sequential access of the passwd database. From d_endpwent_r.U: This variable conditionally defines the CWHAS_ENDPWENT_R symbol, which indicates to the C program that the endpwent_r() routine is available. From d_endsent.U: This variable conditionally defines CWHAS_ENDSERVENT if endservent() is available to close whatever was being used for service queries. From d_endservent_r.U: This variable conditionally defines the CWHAS_ENDSERVENT_R symbol, which indicates to the C program that the endservent_r() routine is available. From nblock_io.U: This variable conditionally defines CWEOF_NONBLOCK if CWEOF can be seen when reading from a non-blocking I/O source. From Guess.U: This variable conditionally defines the symbols CWEUNICE and CWVAX, which alerts the C program that it must deal with ideosyncracies of CWVMS. From d_faststdio.U: This variable conditionally defines the CWHAS_FAST_STDIO symbol, which indicates to the C program that the fast stdio is available to manipulate the stdio buffers directly. From d_fchdir.U: This variable conditionally defines the CWHAS_FCHDIR symbol, which indicates to the C program that the fchdir() routine is available. From d_fchmod.U: This variable conditionally defines the CWHAS_FCHMOD symbol, which indicates to the C program that the fchmod() routine is available to change mode of opened files. From d_fchown.U: This variable conditionally defines the CWHAS_FCHOWN symbol, which indicates to the C program that the fchown() routine is available to change ownership of opened files. From d_fcntl.U: This variable conditionally defines the CWHAS_FCNTL symbol, and indicates whether the fcntl() function exists From d_fcntl_can_lock.U: This variable conditionally defines the CWFCNTL_CAN_LOCK symbol and indicates whether file locking with fcntl() works. From d_fd_set.U: This variable contains the eventual value of the CWHAS_FD_MACROS symbol, which indicates if your C compiler knows about the macros which manipulate an fd_set. From d_fd_set.U: This variable contains the eventual value of the CWHAS_FD_SET symbol, which indicates if your C compiler knows about the fd_set typedef. From d_fd_set.U: This variable contains the eventual value of the CWHAS_FDS_BITS symbol, which indicates if your fd_set typedef contains the fds_bits member. If you have an fd_set typedef, but the dweebs who installed it did a half-fast job and neglected to provide the macros to manipulate an fd_set, CWHAS_FDS_BITS will let us know how to fix the gaffe. From d_fgetpos.U: This variable conditionally defines CWHAS_FGETPOS if fgetpos() is available to get the file position indicator. From d_finite.U: This variable conditionally defines the CWHAS_FINITE symbol, which indicates to the C program that the finite() routine is available. From d_finitel.U: This variable conditionally defines the CWHAS_FINITEL symbol, which indicates to the C program that the finitel() routine is available. From d_flexfnam.U: This variable conditionally defines the CWFLEXFILENAMES symbol, which indicates that the system supports filenames longer than 14 characters. From d_flock.U: This variable conditionally defines CWHAS_FLOCK if flock() is available to do file locking. From d_flockproto.U: This variable conditionally defines the CWHAS_FLOCK_PROTO symbol, which indicates to the C program that the system provides a prototype for the flock() function. Otherwise, it is up to the program to supply one. From d_fork.U: This variable conditionally defines the CWHAS_FORK symbol, which indicates to the C program that the fork() routine is available. From d_fp_class.U: This variable conditionally defines the CWHAS_FP_CLASS symbol, which indicates to the C program that the fp_class() routine is available. From d_pathconf.U: This variable conditionally defines the CWHAS_FPATHCONF symbol, which indicates to the C program that the pathconf() routine is available to determine file-system related limits and options associated with a given open file descriptor. From d_fpclass.U: This variable conditionally defines the CWHAS_FPCLASS symbol, which indicates to the C program that the fpclass() routine is available. From d_fpclassify.U: This variable conditionally defines the CWHAS_FPCLASSIFY symbol, which indicates to the C program that the fpclassify() routine is available. From d_fpclassl.U: This variable conditionally defines the CWHAS_FPCLASSL symbol, which indicates to the C program that the fpclassl() routine is available. From d_fpos64_t.U: This symbol will be defined if the C compiler supports fpos64_t. From d_frexpl.U: This variable conditionally defines the CWHAS_FREXPL symbol, which indicates to the C program that the frexpl() routine is available. From d_fs_data_s.U: This variable conditionally defines the CWHAS_STRUCT_FS_DATA symbol, which indicates that the struct fs_data is supported. From d_fseeko.U: This variable conditionally defines the CWHAS_FSEEKO symbol, which indicates to the C program that the fseeko() routine is available. From d_fsetpos.U: This variable conditionally defines CWHAS_FSETPOS if fsetpos() is available to set the file position indicator. From d_fstatfs.U: This variable conditionally defines the CWHAS_FSTATFS symbol, which indicates to the C program that the fstatfs() routine is available. From d_statvfs.U: This variable conditionally defines the CWHAS_FSTATVFS symbol, which indicates to the C program that the fstatvfs() routine is available. From d_fsync.U: This variable conditionally defines the CWHAS_FSYNC symbol, which indicates to the C program that the fsync() routine is available. From d_ftello.U: This variable conditionally defines the CWHAS_FTELLO symbol, which indicates to the C program that the ftello() routine is available. From d_ftime.U: This variable conditionally defines the CWHAS_FTIME symbol, which indicates that the ftime() routine exists. The ftime() routine is basically a sub-second accuracy clock. From d_gconvert.U: This variable holds what Gconvert is defined as to convert floating point numbers into strings. By default, Configure sets CWthis macro to use the first of gconvert, gcvt, or sprintf that pass sprintf-%g-like behaviour tests. If perl is using long doubles, the macro uses the first of the following functions that pass Configure's tests: qgcvt, sprintf (if Configure knows how to make sprintf format long doublessee sPRIgldbl), gconvert, gcvt, and sprintf (casting to double). The gconvert_preference and gconvert_ld_preference variables can be used to alter Configure's preferences, for doubles and long doubles, respectively. If present, they contain a space-separated list of one or more of the above function names in the order they should be tried. d_Gconvert may be set to override Configure with a platform- specific function. If this function expects a double, a different value may need to be set by the uselongdouble.cbu call-back unit so that long doubles can be formatted without loss of precision. From d_getcwd.U: This variable conditionally defines the CWHAS_GETCWD symbol, which indicates to the C program that the getcwd() routine is available to get the current working directory. From d_getespwnam.U: This variable conditionally defines CWHAS_GETESPWNAM if getespwnam() is available to retrieve enchanced (shadow) password entries by name. From d_getfsstat.U: This variable conditionally defines the CWHAS_GETFSSTAT symbol, which indicates to the C program that the getfsstat() routine is available. From d_getgrent.U: This variable conditionally defines the CWHAS_GETGRENT symbol, which indicates to the C program that the getgrent() routine is available for sequential access of the group database. From d_getgrent_r.U: This variable conditionally defines the CWHAS_GETGRENT_R symbol, which indicates to the C program that the getgrent_r() routine is available. From d_getgrgid_r.U: This variable conditionally defines the CWHAS_GETGRGID_R symbol, which indicates to the C program that the getgrgid_r() routine is available. From d_getgrnam_r.U: This variable conditionally defines the CWHAS_GETGRNAM_R symbol, which indicates to the C program that the getgrnam_r() routine is available. From d_getgrps.U: This variable conditionally defines the CWHAS_GETGROUPS symbol, which indicates to the C program that the getgroups() routine is available to get the list of process groups. From d_gethbyad.U: This variable conditionally defines the CWHAS_GETHOSTBYADDR symbol, which indicates to the C program that the gethostbyaddr() routine is available to look up hosts by their CWIP addresses. From d_gethbynm.U: This variable conditionally defines the CWHAS_GETHOSTBYNAME symbol, which indicates to the C program that the gethostbyname() routine is available to look up host names in some data base or other. From d_gethent.U: This variable conditionally defines CWHAS_GETHOSTENT if gethostent() is available to look up host names in some data base or another. From d_gethname.U: This variable conditionally defines the CWHAS_GETHOSTNAME symbol, which indicates to the C program that the gethostname() routine may be used to derive the host name. From d_gethostbyaddr_r.U: This variable conditionally defines the CWHAS_GETHOSTBYADDR_R symbol, which indicates to the C program that the gethostbyaddr_r() routine is available. From d_gethostbyname_r.U: This variable conditionally defines the CWHAS_GETHOSTBYNAME_R symbol, which indicates to the C program that the gethostbyname_r() routine is available. From d_gethostent_r.U: This variable conditionally defines the CWHAS_GETHOSTENT_R symbol, which indicates to the C program that the gethostent_r() routine is available. From d_gethostprotos.U: This variable conditionally defines the CWHAS_GETHOST_PROTOS symbol, which indicates to the C program that <netdb.h> supplies prototypes for the various gethost*() functions. See also netdbtype.U for probing for various netdb types. From d_getitimer.U: This variable conditionally defines the CWHAS_GETITIMER symbol, which indicates to the C program that the getitimer() routine is available. From d_getlogin.U: This variable conditionally defines the CWHAS_GETLOGIN symbol, which indicates to the C program that the getlogin() routine is available to get the login name. From d_getlogin_r.U: This variable conditionally defines the CWHAS_GETLOGIN_R symbol, which indicates to the C program that the getlogin_r() routine is available. From d_getmnt.U: This variable conditionally defines the CWHAS_GETMNT symbol, which indicates to the C program that the getmnt() routine is available to retrieve one or more mount info blocks by filename. From d_getmntent.U: This variable conditionally defines the CWHAS_GETMNTENT symbol, which indicates to the C program that the getmntent() routine is available to iterate through mounted files to get their mount info. From d_getnbyad.U: This variable conditionally defines the CWHAS_GETNETBYADDR symbol, which indicates to the C program that the getnetbyaddr() routine is available to look up networks by their CWIP addresses. From d_getnbynm.U: This variable conditionally defines the CWHAS_GETNETBYNAME symbol, which indicates to the C program that the getnetbyname() routine is available to look up networks by their names. From d_getnent.U: This variable conditionally defines CWHAS_GETNETENT if getnetent() is available to look up network names in some data base or another. From d_getnetbyaddr_r.U: This variable conditionally defines the CWHAS_GETNETBYADDR_R symbol, which indicates to the C program that the getnetbyaddr_r() routine is available. From d_getnetbyname_r.U: This variable conditionally defines the CWHAS_GETNETBYNAME_R symbol, which indicates to the C program that the getnetbyname_r() routine is available. From d_getnetent_r.U: This variable conditionally defines the CWHAS_GETNETENT_R symbol, which indicates to the C program that the getnetent_r() routine is available. From d_getnetprotos.U: This variable conditionally defines the CWHAS_GETNET_PROTOS symbol, which indicates to the C program that <netdb.h> supplies prototypes for the various getnet*() functions. See also netdbtype.U for probing for various netdb types. From d_getpagsz.U: This variable conditionally defines CWHAS_GETPAGESIZE if getpagesize() is available to get the system page size. From d_getprotby.U: This variable conditionally defines the CWHAS_GETPROTOBYNAME symbol, which indicates to the C program that the getprotobyname() routine is available to look up protocols by their name. From d_getprotby.U: This variable conditionally defines the CWHAS_GETPROTOBYNUMBER symbol, which indicates to the C program that the getprotobynumber() routine is available to look up protocols by their number. From d_getpent.U: This variable conditionally defines CWHAS_GETPROTOENT if getprotoent() is available to look up protocols in some data base or another. From d_getpgid.U: This variable conditionally defines the CWHAS_GETPGID symbol, which indicates to the C program that the getpgid(pid) function is available to get the process group id. From d_getpgrp2.U: This variable conditionally defines the HAS_GETPGRP2 symbol, which indicates to the C program that the getpgrp2() (as in DG/CIUX) routine is available to get the current process group. From d_getpgrp.U: This variable conditionally defines CWHAS_GETPGRP if getpgrp() is available to get the current process group. From d_getppid.U: This variable conditionally defines the CWHAS_GETPPID symbol, which indicates to the C program that the getppid() routine is available to get the parent process CWID. From d_getprior.U: This variable conditionally defines CWHAS_GETPRIORITY if getpriority() is available to get a process's priority. From d_getprotobyname_r.U: This variable conditionally defines the CWHAS_GETPROTOBYNAME_R symbol, which indicates to the C program that the getprotobyname_r() routine is available. From d_getprotobynumber_r.U: This variable conditionally defines the CWHAS_GETPROTOBYNUMBER_R symbol, which indicates to the C program that the getprotobynumber_r() routine is available. From d_getprotoent_r.U: This variable conditionally defines the CWHAS_GETPROTOENT_R symbol, which indicates to the C program that the getprotoent_r() routine is available. From d_getprotoprotos.U: This variable conditionally defines the CWHAS_GETPROTO_PROTOS symbol, which indicates to the C program that <netdb.h> supplies prototypes for the various getproto*() functions. See also netdbtype.U for probing for various netdb types. From d_getprpwnam.U: This variable conditionally defines CWHAS_GETPRPWNAM if getprpwnam() is available to retrieve protected (shadow) password entries by name. From d_getpwent.U: This variable conditionally defines the CWHAS_GETPWENT symbol, which indicates to the C program that the getpwent() routine is available for sequential access of the passwd database. From d_getpwent_r.U: This variable conditionally defines the CWHAS_GETPWENT_R symbol, which indicates to the C program that the getpwent_r() routine is available. From d_getpwnam_r.U: This variable conditionally defines the CWHAS_GETPWNAM_R symbol, which indicates to the C program that the getpwnam_r() routine is available. From d_getpwuid_r.U: This variable conditionally defines the CWHAS_GETPWUID_R symbol, which indicates to the C program that the getpwuid_r() routine is available. From d_getsrvby.U: This variable conditionally defines the CWHAS_GETSERVBYNAME symbol, which indicates to the C program that the getservbyname() routine is available to look up services by their name. From d_getsrvby.U: This variable conditionally defines the CWHAS_GETSERVBYPORT symbol, which indicates to the C program that the getservbyport() routine is available to look up services by their port. From d_getsent.U: This variable conditionally defines CWHAS_GETSERVENT if getservent() is available to look up network services in some data base or another. From d_getservbyname_r.U: This variable conditionally defines the CWHAS_GETSERVBYNAME_R symbol, which indicates to the C program that the getservbyname_r() routine is available. From d_getservbyport_r.U: This variable conditionally defines the CWHAS_GETSERVBYPORT_R symbol, which indicates to the C program that the getservbyport_r() routine is available. From d_getservent_r.U: This variable conditionally defines the CWHAS_GETSERVENT_R symbol, which indicates to the C program that the getservent_r() routine is available. From d_getservprotos.U: This variable conditionally defines the CWHAS_GETSERV_PROTOS symbol, which indicates to the C program that <netdb.h> supplies prototypes for the various getserv*() functions. See also netdbtype.U for probing for various netdb types. From d_getspnam.U: This variable conditionally defines CWHAS_GETSPNAM if getspnam() is available to retrieve SysV shadow password entries by name. From d_getspnam_r.U: This variable conditionally defines the CWHAS_GETSPNAM_R symbol, which indicates to the C program that the getspnam_r() routine is available. From d_ftime.U: This variable conditionally defines the CWHAS_GETTIMEOFDAY symbol, which indicates that the gettimeofday() system call exists (to obtain a sub-second accuracy clock). You should probably include <sys/resource.h>. From d_gmtime_r.U: This variable conditionally defines the CWHAS_GMTIME_R symbol, which indicates to the C program that the gmtime_r() routine is available. From d_gnulibc.U: Defined if we're dealing with the CWGNU C Library. From i_grp.U: This variable conditionally defines CWGRPASSWD, which indicates that struct group in <grp.h> contains gr_passwd. From d_hasmntopt.U: This variable conditionally defines the CWHAS_HASMNTOPT symbol, which indicates to the C program that the hasmntopt() routine is available to query the mount options of file systems. From d_htonl.U: This variable conditionally defines CWHAS_HTONL if htonl() and its friends are available to do network order byte swapping. From d_ilogbl.U: This variable conditionally defines the CWHAS_ILOGBL symbol, which indicates to the C program that the ilogbl() routine is available. If scalbnl is also present we can emulate frexpl. From d_strchr.U: This variable conditionally defines CWHAS_INDEX if index() and rindex() are available for string searching. From d_inetaton.U: This variable conditionally defines the CWHAS_INET_ATON symbol, which indicates to the C program that the inet_aton() function is available to parse CWIP address CWdotted-quad strings. From d_int64_t.U: This symbol will be defined if the C compiler supports int64_t. From d_isascii.U: This variable conditionally defines the CWHAS_ISASCII constant, which indicates to the C program that isascii() is available. From d_isfinite.U: This variable conditionally defines the CWHAS_ISFINITE symbol, which indicates to the C program that the isfinite() routine is available. From d_isinf.U: This variable conditionally defines the CWHAS_ISINF symbol, which indicates to the C program that the isinf() routine is available. From d_isnan.U: This variable conditionally defines the CWHAS_ISNAN symbol, which indicates to the C program that the isnan() routine is available. From d_isnanl.U: This variable conditionally defines the CWHAS_ISNANL symbol, which indicates to the C program that the isnanl() routine is available. From d_killpg.U: This variable conditionally defines the CWHAS_KILLPG symbol, which indicates to the C program that the killpg() routine is available to kill process groups. From d_lchown.U: This variable conditionally defines the CWHAS_LCHOWN symbol, which indicates to the C program that the lchown() routine is available to operate on a symbolic link (instead of following the link). From d_ldbl_dig.U: This variable conditionally defines d_ldbl_dig if this system's header files provide CWLDBL_DIG, which is the number of significant digits in a long double precision number. From d_link.U: This variable conditionally defines CWHAS_LINK if link() is available to create hard links. From d_localtime_r.U: This variable conditionally defines the CWHAS_LOCALTIME_R symbol, which indicates to the C program that the localtime_r() routine is available. From d_locconv.U: This variable conditionally defines CWHAS_LOCALECONV if localeconv() is available for numeric and monetary formatting conventions. From d_lockf.U: This variable conditionally defines CWHAS_LOCKF if lockf() is available to do file locking. From d_longdbl.U: This variable conditionally defines CWHAS_LONG_DOUBLE if the long double type is supported. From d_longlong.U: This variable conditionally defines CWHAS_LONG_LONG if the long long type is supported. From d_lseekproto.U: This variable conditionally defines the CWHAS_LSEEK_PROTO symbol, which indicates to the C program that the system provides a prototype for the lseek() function. Otherwise, it is up to the program to supply one. From d_lstat.U: This variable conditionally defines CWHAS_LSTAT if lstat() is available to do file stats on symbolic links. From d_madvise.U: This variable conditionally defines CWHAS_MADVISE if madvise() is available to map a file into memory. From d_mblen.U: This variable conditionally defines the CWHAS_MBLEN symbol, which indicates to the C program that the mblen() routine is available to find the number of bytes in a multibye character. From d_mbstowcs.U: This variable conditionally defines the CWHAS_MBSTOWCS symbol, which indicates to the C program that the mbstowcs() routine is available to convert a multibyte string into a wide character string. From d_mbtowc.U: This variable conditionally defines the CWHAS_MBTOWC symbol, which indicates to the C program that the mbtowc() routine is available to convert multibyte to a wide character. From d_memchr.U: This variable conditionally defines the CWHAS_MEMCHR symbol, which indicates to the C program that the memchr() routine is available to locate characters within a C string. From d_memcmp.U: This variable conditionally defines the CWHAS_MEMCMP symbol, which indicates to the C program that the memcmp() routine is available to compare blocks of memory. From d_memcpy.U: This variable conditionally defines the CWHAS_MEMCPY symbol, which indicates to the C program that the memcpy() routine is available to copy blocks of memory. From d_memmove.U: This variable conditionally defines the CWHAS_MEMMOVE symbol, which indicates to the C program that the memmove() routine is available to copy potentatially overlapping blocks of memory. From d_memset.U: This variable conditionally defines the CWHAS_MEMSET symbol, which indicates to the C program that the memset() routine is available to set blocks of memory. From d_mkdir.U: This variable conditionally defines the CWHAS_MKDIR symbol, which indicates to the C program that the mkdir() routine is available to create directories.. From d_mkdtemp.U: This variable conditionally defines the CWHAS_MKDTEMP symbol, which indicates to the C program that the mkdtemp() routine is available to exclusively create a uniquely named temporary directory. From d_mkfifo.U: This variable conditionally defines the CWHAS_MKFIFO symbol, which indicates to the C program that the mkfifo() routine is available. From d_mkstemp.U: This variable conditionally defines the CWHAS_MKSTEMP symbol, which indicates to the C program that the mkstemp() routine is available to exclusively create and open a uniquely named temporary file. From d_mkstemps.U: This variable conditionally defines the CWHAS_MKSTEMPS symbol, which indicates to the C program that the mkstemps() routine is available to exclusively create and open a uniquely named (with a suffix) temporary file. From d_mktime.U: This variable conditionally defines the CWHAS_MKTIME symbol, which indicates to the C program that the mktime() routine is available. From d_mmap.U: This variable conditionally defines CWHAS_MMAP if mmap() is available to map a file into memory. From d_modfl.U: This variable conditionally defines the CWHAS_MODFL symbol, which indicates to the C program that the modfl() routine is available. From d_modfl.U: This variable conditionally defines the HAS_MODFL_POW32_BUG symbol, which indicates that modfl() is broken for long doubles >= pow(2, 32). For example from 4294967303.150000 one would get 4294967302.000000 and 1.150000. The bug has been seen in certain versions of glibc, release 2.2.2 is known to be okay. From d_modfl.U: This symbol, if defined, indicates that the system provides a prototype for the modfl() function. Otherwise, it is up to the program to supply one. C99 says it should be long double modfl(long double, long double *); From d_mprotect.U: This variable conditionally defines CWHAS_MPROTECT if mprotect() is available to modify the access protection of a memory mapped file. From d_msg.U: This variable conditionally defines the CWHAS_MSG symbol, which indicates that the entire msg*(2) library is present. From d_socket.U: This variable conditionally defines the CWHAS_MSG_CTRUNC symbol, which indicates that the CWMSG_CTRUNC is available. #ifdef is not enough because it may be an enum, glibc has been known to do this. From d_socket.U: This variable conditionally defines the CWHAS_MSG_DONTROUTE symbol, which indicates that the CWMSG_DONTROUTE is available. #ifdef is not enough because it may be an enum, glibc has been known to do this. From d_socket.U: This variable conditionally defines the CWHAS_MSG_OOB symbol, which indicates that the CWMSG_OOB is available. #ifdef is not enough because it may be an enum, glibc has been known to do this. From d_socket.U: This variable conditionally defines the CWHAS_MSG_PEEK symbol, which indicates that the CWMSG_PEEK is available. #ifdef is not enough because it may be an enum, glibc has been known to do this. From d_socket.U: This variable conditionally defines the CWHAS_MSG_PROXY symbol, which indicates that the CWMSG_PROXY is available. #ifdef is not enough because it may be an enum, glibc has been known to do this. From d_msgctl.U: This variable conditionally defines the CWHAS_MSGCTL symbol, which indicates to the C program that the msgctl() routine is available. From d_msgget.U: This variable conditionally defines the CWHAS_MSGGET symbol, which indicates to the C program that the msgget() routine is available. From d_msghdr_s.U: This variable conditionally defines the CWHAS_STRUCT_MSGHDR symbol, which indicates that the struct msghdr is supported. From d_msgrcv.U: This variable conditionally defines the CWHAS_MSGRCV symbol, which indicates to the C program that the msgrcv() routine is available. From d_msgsnd.U: This variable conditionally defines the CWHAS_MSGSND symbol, which indicates to the C program that the msgsnd() routine is available. From d_msync.U: This variable conditionally defines CWHAS_MSYNC if msync() is available to synchronize a mapped file. From d_munmap.U: This variable conditionally defines CWHAS_MUNMAP if munmap() is available to unmap a region mapped by mmap(). From mallocsrc.U: This variable conditionally defines CWMYMALLOC in case other parts of the source want to take special action if CWMYMALLOC is used. This may include different sorts of profiling or error detection. From d_nanosleep.U: This variable conditionally defines CWHAS_NANOSLEEP if nanosleep() is available to sleep with 1E-9 sec accuracy. From d_nice.U: This variable conditionally defines the CWHAS_NICE symbol, which indicates to the C program that the nice() routine is available. From d_nl_langinfo.U: This variable conditionally defines the CWHAS_NL_LANGINFO symbol, which indicates to the C program that the nl_langinfo() routine is available. From perlxv.U: This variable indicates whether a variable of type nvtype can preserve all the bits a variable of type uvtype. From d_off64_t.U: This symbol will be defined if the C compiler supports off64_t. From d_pthrattrj.U: This variable conditionally defines pthread_create_joinable. undef if pthread.h defines CWPTHREAD_CREATE_JOINABLE. From usethreads.U: This variable conditionally defines the CWOLD_PTHREADS_API symbol, and indicates that Perl should be built to use the old draft CWPOSIX threads CWAPI. This is only potentially meaningful if usethreads is set. From d_socket.U: This variable conditionally defines the CWOLDSOCKET symbol, which indicates that the CWBSD socket interface is based on 4.1c and not 4.2. From d_open3.U: This variable conditionally defines the HAS_OPEN3 manifest constant, which indicates to the C program that the 3 argument version of the open(2) function is available. From d_pathconf.U: This variable conditionally defines the CWHAS_PATHCONF symbol, which indicates to the C program that the pathconf() routine is available to determine file-system related limits and options associated with a given filename. From d_pause.U: This variable conditionally defines the CWHAS_PAUSE symbol, which indicates to the C program that the pause() routine is available to suspend a process until a signal is received. From otherlibdirs.U: This variable conditionally defines CWPERL_OTHERLIBDIRS, which contains a colon-separated set of paths for the perl binary to include in @CWINC. See also otherlibdirs. From d_gethname.U: This variable conditionally defines the CWHAS_PHOSTNAME symbol, which contains the shell command which, when fed to popen(), may be used to derive the host name. From d_pipe.U: This variable conditionally defines the CWHAS_PIPE symbol, which indicates to the C program that the pipe() routine is available to create an inter-process channel. From d_poll.U: This variable conditionally defines the CWHAS_POLL symbol, which indicates to the C program that the poll() routine is available to poll active file descriptors. From d_portable.U: This variable conditionally defines the CWPORTABLE symbol, which indicates to the C program that it should not assume that it is running on the machine it was compiled on. From quadfio.U: This variable conditionally defines the PERL_PRId64 symbol, which indiciates that stdio has a symbol to print 64-bit decimal numbers. From longdblfio.U: This variable conditionally defines the PERL_PRIfldbl symbol, which indiciates that stdio has a symbol to print long doubles. From longdblfio.U: This variable conditionally defines the PERL_PRIfldbl symbol, which indiciates that stdio has a symbol to print long doubles. The CWU in the name is to separate this from d_PRIeldbl so that even case-blind systems can see the difference. From longdblfio.U: This variable conditionally defines the PERL_PRIfldbl symbol, which indiciates that stdio has a symbol to print long doubles. From longdblfio.U: This variable conditionally defines the PERL_PRIfldbl symbol, which indiciates that stdio has a symbol to print long doubles. The CWU in the name is to separate this from d_PRIfldbl so that even case-blind systems can see the difference. From longdblfio.U: This variable conditionally defines the PERL_PRIfldbl symbol, which indiciates that stdio has a symbol to print long doubles. From longdblfio.U: This variable conditionally defines the PERL_PRIfldbl symbol, which indiciates that stdio has a symbol to print long doubles. The CWU in the name is to separate this from d_PRIgldbl so that even case-blind systems can see the difference. From quadfio.U: This variable conditionally defines the PERL_PRIi64 symbol, which indiciates that stdio has a symbol to print 64-bit decimal numbers. From quadfio.U: This variable conditionally defines the PERL_PRIo64 symbol, which indiciates that stdio has a symbol to print 64-bit octal numbers. From quadfio.U: This variable conditionally defines the PERL_PRIu64 symbol, which indiciates that stdio has a symbol to print 64-bit unsigned decimal numbers. From quadfio.U: This variable conditionally defines the PERL_PRIx64 symbol, which indiciates that stdio has a symbol to print 64-bit hexadecimal numbers. From quadfio.U: This variable conditionally defines the PERL_PRIXU64 symbol, which indiciates that stdio has a symbol to print 64-bit hExADECimAl numbers. The CWU in the name is to separate this from d_PRIx64 so that even case-blind systems can see the difference. From d_procselfexe.U: Defined if CW$procselfexe is symlink to the absolute pathname of the executing program. From d_pthread_atfork.U: This variable conditionally defines the CWHAS_PTHREAD_ATFORK symbol, which indicates to the C program that the pthread_atfork() routine is available. From d_pthread_attr_ss.U: This variable conditionally defines CWHAS_PTHREAD_ATTR_SETSCOPE if pthread_attr_setscope() is available to set the contention scope attribute of a thread attribute object. From d_pthread_y.U: This variable conditionally defines the CWHAS_PTHREAD_YIELD symbol if the pthread_yield routine is available to yield the execution of the current thread. From i_pwd.U: This variable conditionally defines CWPWAGE, which indicates that struct passwd contains pw_age. From i_pwd.U: This variable conditionally defines CWPWCHANGE, which indicates that struct passwd contains pw_change. From i_pwd.U: This variable conditionally defines CWPWCLASS, which indicates that struct passwd contains pw_class. From i_pwd.U: This variable conditionally defines CWPWCOMMENT, which indicates that struct passwd contains pw_comment. From i_pwd.U: This variable conditionally defines CWPWEXPIRE, which indicates that struct passwd contains pw_expire. From i_pwd.U: This variable conditionally defines CWPWGECOS, which indicates that struct passwd contains pw_gecos. From i_pwd.U: This variable conditionally defines CWPWPASSWD, which indicates that struct passwd contains pw_passwd. From i_pwd.U: This variable conditionally defines CWPWQUOTA, which indicates that struct passwd contains pw_quota. From d_qgcvt.U: This variable conditionally defines the CWHAS_QGCVT symbol, which indicates to the C program that the qgcvt() routine is available. From quadtype.U: This variable, if defined, tells that there's a 64-bit integer type, quadtype. From d_random_r.U: This variable conditionally defines the CWHAS_RANDOM_R symbol, which indicates to the C program that the random_r() routine is available. From d_readdir64_r.U: This variable conditionally defines the HAS_READDIR64_R symbol, which indicates to the C program that the readdir64_r() routine is available. From d_readdir.U: This variable conditionally defines CWHAS_READDIR if readdir() is available to read directory entries. From d_readdir_r.U: This variable conditionally defines the CWHAS_READDIR_R symbol, which indicates to the C program that the readdir_r() routine is available. From d_readlink.U: This variable conditionally defines the CWHAS_READLINK symbol, which indicates to the C program that the readlink() routine is available to read the value of a symbolic link. From d_readv.U: This variable conditionally defines the CWHAS_READV symbol, which indicates to the C program that the readv() routine is available. From d_recvmsg.U: This variable conditionally defines the CWHAS_RECVMSG symbol, which indicates to the C program that the recvmsg() routine is available. From d_rename.U: This variable conditionally defines the CWHAS_RENAME symbol, which indicates to the C program that the rename() routine is available to rename files. From d_readdir.U: This variable conditionally defines CWHAS_REWINDDIR if rewinddir() is available. From d_rmdir.U: This variable conditionally defines CWHAS_RMDIR if rmdir() is available to remove directories. From d_safebcpy.U: This variable conditionally defines the CWHAS_SAFE_BCOPY symbol if the bcopy() routine can do overlapping copies. Normally, you should probably use memmove(). From d_safemcpy.U: This variable conditionally defines the CWHAS_SAFE_MEMCPY symbol if the memcpy() routine can do overlapping copies. For overlapping copies, memmove() should be used, if available. From d_sanemcmp.U: This variable conditionally defines the CWHAS_SANE_MEMCMP symbol if the memcpy() routine is available and can be used to compare relative magnitudes of chars with their high bits set. From d_sbrkproto.U: This variable conditionally defines the CWHAS_SBRK_PROTO symbol, which indicates to the C program that the system provides a prototype for the sbrk() function. Otherwise, it is up to the program to supply one. From d_scalbnl.U: This variable conditionally defines the CWHAS_SCALBNL symbol, which indicates to the C program that the scalbnl() routine is available. If ilogbl is also present we can emulate frexpl. From d_pthread_y.U: This variable conditionally defines the CWHAS_SCHED_YIELD symbol if the sched_yield routine is available to yield the execution of the current thread. From d_socket.U: This variable conditionally defines the CWHAS_SCM_RIGHTS symbol, which indicates that the CWSCM_RIGHTS is available. #ifdef is not enough because it may be an enum, glibc has been known to do this. From longdblfio.U: This variable conditionally defines the PERL_PRIfldbl symbol, which indiciates that stdio has a symbol to scan long doubles. From d_readdir.U: This variable conditionally defines CWHAS_SEEKDIR if seekdir() is available. From d_select.U: This variable conditionally defines CWHAS_SELECT if select() is available to select active file descriptors. A <sys/time.h> inclusion may be necessary for the timeout field. From d_sem.U: This variable conditionally defines the CWHAS_SEM symbol, which indicates that the entire sem*(2) library is present. From d_semctl.U: This variable conditionally defines the CWHAS_SEMCTL symbol, which indicates to the C program that the semctl() routine is available. From d_union_semun.U: This variable conditionally defines CWUSE_SEMCTL_SEMID_DS, which indicates that struct semid_ds * is to be used for semctl CWIPC_STAT. From d_union_semun.U: This variable conditionally defines CWUSE_SEMCTL_SEMUN, which indicates that union semun is to be used for semctl CWIPC_STAT. From d_semget.U: This variable conditionally defines the CWHAS_SEMGET symbol, which indicates to the C program that the semget() routine is available. From d_semop.U: This variable conditionally defines the CWHAS_SEMOP symbol, which indicates to the C program that the semop() routine is available. From d_sendmsg.U: This variable conditionally defines the CWHAS_SENDMSG symbol, which indicates to the C program that the sendmsg() routine is available. From d_setegid.U: This variable conditionally defines the CWHAS_SETEGID symbol, which indicates to the C program that the setegid() routine is available to change the effective gid of the current program. From d_seteuid.U: This variable conditionally defines the CWHAS_SETEUID symbol, which indicates to the C program that the seteuid() routine is available to change the effective uid of the current program. From d_setgrent.U: This variable conditionally defines the CWHAS_SETGRENT symbol, which indicates to the C program that the setgrent() routine is available for initializing sequential access to the group database. From d_setgrent_r.U: This variable conditionally defines the CWHAS_SETGRENT_R symbol, which indicates to the C program that the setgrent_r() routine is available. From d_setgrps.U: This variable conditionally defines the CWHAS_SETGROUPS symbol, which indicates to the C program that the setgroups() routine is available to set the list of process groups. From d_sethent.U: This variable conditionally defines CWHAS_SETHOSTENT if sethostent() is available. From d_sethostent_r.U: This variable conditionally defines the CWHAS_SETHOSTENT_R symbol, which indicates to the C program that the sethostent_r() routine is available. From d_setitimer.U: This variable conditionally defines the CWHAS_SETITIMER symbol, which indicates to the C program that the setitimer() routine is available. From d_setlnbuf.U: This variable conditionally defines the CWHAS_SETLINEBUF symbol, which indicates to the C program that the setlinebuf() routine is available to change stderr or stdout from block-buffered or unbuffered to a line-buffered mode. From d_setlocale.U: This variable conditionally defines CWHAS_SETLOCALE if setlocale() is available to handle locale-specific ctype implementations. From d_setlocale_r.U: This variable conditionally defines the CWHAS_SETLOCALE_R symbol, which indicates to the C program that the setlocale_r() routine is available. From d_setnent.U: This variable conditionally defines CWHAS_SETNETENT if setnetent() is available. From d_setnetent_r.U: This variable conditionally defines the CWHAS_SETNETENT_R symbol, which indicates to the C program that the setnetent_r() routine is available. From d_setpent.U: This variable conditionally defines CWHAS_SETPROTOENT if setprotoent() is available. From d_setpgid.U: This variable conditionally defines the CWHAS_SETPGID symbol if the setpgid(pid, gpid) function is available to set process group CWID. From d_setpgrp2.U: This variable conditionally defines the HAS_SETPGRP2 symbol, which indicates to the C program that the setpgrp2() (as in DG/CIUX) routine is available to set the current process group. From d_setpgrp.U: This variable conditionally defines CWHAS_SETPGRP if setpgrp() is available to set the current process group. From d_setprior.U: This variable conditionally defines CWHAS_SETPRIORITY if setpriority() is available to set a process's priority. From d_setproctitle.U: This variable conditionally defines the CWHAS_SETPROCTITLE symbol, which indicates to the C program that the setproctitle() routine is available. From d_setprotoent_r.U: This variable conditionally defines the CWHAS_SETPROTOENT_R symbol, which indicates to the C program that the setprotoent_r() routine is available. From d_setpwent.U: This variable conditionally defines the CWHAS_SETPWENT symbol, which indicates to the C program that the setpwent() routine is available for initializing sequential access to the passwd database. From d_setpwent_r.U: This variable conditionally defines the CWHAS_SETPWENT_R symbol, which indicates to the C program that the setpwent_r() routine is available. From d_setregid.U: This variable conditionally defines CWHAS_SETREGID if setregid() is available to change the real and effective gid of the current process. From d_setregid.U: This variable conditionally defines CWHAS_SETRESGID if setresgid() is available to change the real, effective and saved gid of the current process. From d_setreuid.U: This variable conditionally defines CWHAS_SETREUID if setresuid() is available to change the real, effective and saved uid of the current process. From d_setreuid.U: This variable conditionally defines CWHAS_SETREUID if setreuid() is available to change the real and effective uid of the current process. From d_setrgid.U: This variable conditionally defines the CWHAS_SETRGID symbol, which indicates to the C program that the setrgid() routine is available to change the real gid of the current program. From d_setruid.U: This variable conditionally defines the CWHAS_SETRUID symbol, which indicates to the C program that the setruid() routine is available to change the real uid of the current program. From d_setsent.U: This variable conditionally defines CWHAS_SETSERVENT if setservent() is available. From d_setservent_r.U: This variable conditionally defines the CWHAS_SETSERVENT_R symbol, which indicates to the C program that the setservent_r() routine is available. From d_setsid.U: This variable conditionally defines CWHAS_SETSID if setsid() is available to set the process group CWID. From d_setvbuf.U: This variable conditionally defines the CWHAS_SETVBUF symbol, which indicates to the C program that the setvbuf() routine is available to change buffering on an open stdio stream. From d_sfio.U: This variable conditionally defines the CWUSE_SFIO symbol, and indicates whether sfio is available (and should be used). From d_shm.U: This variable conditionally defines the CWHAS_SHM symbol, which indicates that the entire shm*(2) library is present. From d_shmat.U: This variable conditionally defines the CWHAS_SHMAT symbol, which indicates to the C program that the shmat() routine is available. From d_shmat.U: This variable conditionally defines the CWHAS_SHMAT_PROTOTYPE symbol, which indicates that sys/shm.h has a prototype for shmat. From d_shmctl.U: This variable conditionally defines the CWHAS_SHMCTL symbol, which indicates to the C program that the shmctl() routine is available. From d_shmdt.U: This variable conditionally defines the CWHAS_SHMDT symbol, which indicates to the C program that the shmdt() routine is available. From d_shmget.U: This variable conditionally defines the CWHAS_SHMGET symbol, which indicates to the C program that the shmget() routine is available. From d_sigaction.U: This variable conditionally defines the CWHAS_SIGACTION symbol, which indicates that the Vr4 sigaction() routine is available. From d_sigprocmask.U: This variable conditionally defines CWHAS_SIGPROCMASK if sigprocmask() is available to examine or change the signal mask of the calling process. From d_sigsetjmp.U: This variable conditionally defines the CWHAS_SIGSETJMP symbol, which indicates that the sigsetjmp() routine is available to call setjmp() and optionally save the process's signal mask. From d_sockatmark.U: This variable conditionally defines the CWHAS_SOCKATMARK symbol, which indicates to the C program that the sockatmark() routine is available. From d_sockatmarkproto.U: This variable conditionally defines the CWHAS_SOCKATMARK_PROTO symbol, which indicates to the C program that the system provides a prototype for the sockatmark() function. Otherwise, it is up to the program to supply one. From d_socket.U: This variable conditionally defines CWHAS_SOCKET, which indicates that the CWBSD socket interface is supported. From d_socklen_t.U: This symbol will be defined if the C compiler supports socklen_t. From d_socket.U: This variable conditionally defines the CWHAS_SOCKETPAIR symbol, which indicates that the CWBSD socketpair() is supported. From d_socks5_init.U: This variable conditionally defines the HAS_SOCKS5_INIT symbol, which indicates to the C program that the socks5_init() routine is available. From d_sqrtl.U: This variable conditionally defines the CWHAS_SQRTL symbol, which indicates to the C program that the sqrtl() routine is available. From d_srand48_r.U: This variable conditionally defines the HAS_SRAND48_R symbol, which indicates to the C program that the srand48_r() routine is available. From d_srandom_r.U: This variable conditionally defines the CWHAS_SRANDOM_R symbol, which indicates to the C program that the srandom_r() routine is available. From d_sresgproto.U: This variable conditionally defines the CWHAS_SETRESGID_PROTO symbol, which indicates to the C program that the system provides a prototype for the setresgid() function. Otherwise, it is up to the program to supply one. From d_sresuproto.U: This variable conditionally defines the CWHAS_SETRESUID_PROTO symbol, which indicates to the C program that the system provides a prototype for the setresuid() function. Otherwise, it is up to the program to supply one. From d_statblks.U: This variable conditionally defines CWUSE_STAT_BLOCKS if this system has a stat structure declaring st_blksize and st_blocks. From d_statfs_f_flags.U: This variable conditionally defines the CWHAS_STRUCT_STATFS_F_FLAGS symbol, which indicates to struct statfs from has f_flags member. This kind of struct statfs is coming from sys/mount.h (CWBSD), not from sys/statfs.h (CWSYSV). From d_statfs_s.U: This variable conditionally defines the CWHAS_STRUCT_STATFS symbol, which indicates that the struct statfs is supported. From d_statvfs.U: This variable conditionally defines the CWHAS_STATVFS symbol, which indicates to the C program that the statvfs() routine is available. From d_stdstdio.U: This variable conditionally defines CWSTDIO_CNT_LVALUE if the CWFILE_cnt macro can be used as an lvalue. From d_stdstdio.U: This variable conditionally defines CWSTDIO_PTR_LVALUE if the CWFILE_ptr macro can be used as an lvalue. From d_stdstdio.U: This symbol is defined if using the CWFILE_ptr macro as an lvalue to increase the pointer by n leaves File_cnt(fp) unchanged. From d_stdstdio.U: This symbol is defined if using the CWFILE_ptr macro as an lvalue to increase the pointer by n has the side effect of decreasing the value of File_cnt(fp) by n. From stdio_streams.U: This variable tells whether there is an array holding the stdio streams. From d_stdstdio.U: This variable conditionally defines CWUSE_STDIO_BASE if this system has a CWFILE structure declaring a usable _base field (or equivalent) in stdio.h. From d_stdstdio.U: This variable conditionally defines CWUSE_STDIO_PTR if this system has a CWFILE structure declaring usable _ptr and _cnt fields (or equivalent) in stdio.h. From d_strchr.U: This variable conditionally defines CWHAS_STRCHR if strchr() and strrchr() are available for string searching. From d_strcoll.U: This variable conditionally defines CWHAS_STRCOLL if strcoll() is available to compare strings using collating information. From d_strctcpy.U: This variable conditionally defines the CWUSE_STRUCT_COPY symbol, which indicates to the C program that this C compiler knows how to copy structures. From d_strerror.U: This variable holds what Strerrr is defined as to translate an error code condition into an error message string. It could be CWstrerror or a more CWcomplex macro emulating strrror with sys_errlist[], or the CWunknown string when both strerror and sys_errlist are missing. From d_strerror.U: This variable conditionally defines CWHAS_STRERROR if strerror() is available to translate error numbers to strings. From d_strerror_r.U: This variable conditionally defines the CWHAS_STRERROR_R symbol, which indicates to the C program that the strerror_r() routine is available. From d_strftime.U: This variable conditionally defines the CWHAS_STRFTIME symbol, which indicates to the C program that the strftime() routine is available. From d_strlcat.U: This variable conditionally defines the CWHAS_STRLCAT symbol, which indicates to the C program that the strlcat () routine is available. From d_strlcpy.U: This variable conditionally defines the CWHAS_STRLCPY symbol, which indicates to the C program that the strlcpy () routine is available. From d_strtod.U: This variable conditionally defines the CWHAS_STRTOD symbol, which indicates to the C program that the strtod() routine is available to provide better numeric string conversion than atof(). From d_strtol.U: This variable conditionally defines the CWHAS_STRTOL symbol, which indicates to the C program that the strtol() routine is available to provide better numeric string conversion than atoi() and friends. From d_strtold.U: This variable conditionally defines the CWHAS_STRTOLD symbol, which indicates to the C program that the strtold() routine is available. From d_strtoll.U: This variable conditionally defines the CWHAS_STRTOLL symbol, which indicates to the C program that the strtoll() routine is available. From d_strtoq.U: This variable conditionally defines the CWHAS_STRTOQ symbol, which indicates to the C program that the strtoq() routine is available. From d_strtoul.U: This variable conditionally defines the CWHAS_STRTOUL symbol, which indicates to the C program that the strtoul() routine is available to provide conversion of strings to unsigned long. From d_strtoull.U: This variable conditionally defines the CWHAS_STRTOULL symbol, which indicates to the C program that the strtoull() routine is available. From d_strtouq.U: This variable conditionally defines the CWHAS_STRTOUQ symbol, which indicates to the C program that the strtouq() routine is available. From d_strxfrm.U: This variable conditionally defines CWHAS_STRXFRM if strxfrm() is available to transform strings. From d_dosuid.U: This variable conditionally defines CWSETUID_SCRIPTS_ARE_SECURE_NOW if setuid scripts can be secure. This test looks in /dev/fd/. From d_symlink.U: This variable conditionally defines the CWHAS_SYMLINK symbol, which indicates to the C program that the symlink() routine is available to create symbolic links. From d_syscall.U: This variable conditionally defines CWHAS_SYSCALL if syscall() is available call arbitrary system calls. From d_syscallproto.U: This variable conditionally defines the CWHAS_SYSCALL_PROTO symbol, which indicates to the C program that the system provides a prototype for the syscall() function. Otherwise, it is up to the program to supply one. From d_sysconf.U: This variable conditionally defines the CWHAS_SYSCONF symbol, which indicates to the C program that the sysconf() routine is available to determine system related limits and options. From d_strerror.U: This variable conditionally defines CWHAS_SYS_ERRNOLIST if sys_errnolist[] is available to translate error numbers to the symbolic name. From d_strerror.U: This variable conditionally defines CWHAS_SYS_ERRLIST if sys_errlist[] is available to translate error numbers to strings. From d_system.U: This variable conditionally defines CWHAS_SYSTEM if system() is available to issue a shell command. From d_tcgtpgrp.U: This variable conditionally defines the CWHAS_TCGETPGRP symbol, which indicates to the C program that the tcgetpgrp() routine is available. to get foreground process group CWID. From d_tcstpgrp.U: This variable conditionally defines the CWHAS_TCSETPGRP symbol, which indicates to the C program that the tcsetpgrp() routine is available to set foreground process group CWID. From d_readdir.U: This variable conditionally defines CWHAS_TELLDIR if telldir() is available. From d_telldirproto.U: This variable conditionally defines the CWHAS_TELLDIR_PROTO symbol, which indicates to the C program that the system provides a prototype for the telldir() function. Otherwise, it is up to the program to supply one. From d_time.U: This variable conditionally defines the CWHAS_TIME symbol, which indicates that the time() routine exists. The time() routine is normaly provided on CWUNIX systems. From d_times.U: This variable conditionally defines the CWHAS_TIMES symbol, which indicates that the times() routine exists. The times() routine is normaly provided on CWUNIX systems. You may have to include <sys/times.h>. From i_time.U: This variable conditionally defines CWHAS_TM_TM_GMTOFF, which indicates indicates to the C program that the struct tm has the tm_gmtoff field. From i_time.U: This variable conditionally defines CWHAS_TM_TM_ZONE, which indicates indicates to the C program that the struct tm has the tm_zone field. From d_tmpnam_r.U: This variable conditionally defines the CWHAS_TMPNAM_R symbol, which indicates to the C program that the tmpnam_r() routine is available. From d_truncate.U: This variable conditionally defines CWHAS_TRUNCATE if truncate() is available to truncate files. From d_ttyname_r.U: This variable conditionally defines the CWHAS_TTYNAME_R symbol, which indicates to the C program that the ttyname_r() routine is available. From d_tzname.U: This variable conditionally defines CWHAS_TZNAME if tzname[] is available to access timezone names. From d_u32align.U: This variable tells whether you must access character data through U32-aligned pointers. From d_ualarm.U: This variable conditionally defines the CWHAS_UALARM symbol, which indicates to the C program that the ualarm() routine is available. From d_umask.U: This variable conditionally defines the CWHAS_UMASK symbol, which indicates to the C program that the umask() routine is available. to set and get the value of the file creation mask. From d_gethname.U: This variable conditionally defines the CWHAS_UNAME symbol, which indicates to the C program that the uname() routine may be used to derive the host name. From d_union_semun.U: This variable conditionally defines CWHAS_UNION_SEMUN if the union semun is defined by including <sys/sem.h>. From d_unordered.U: This variable conditionally defines the CWHAS_UNORDERED symbol, which indicates to the C program that the unordered() routine is available. From d_usleep.U: This variable conditionally defines CWHAS_USLEEP if usleep() is available to do high granularity sleeps. From d_usleepproto.U: This variable conditionally defines the CWHAS_USLEEP_PROTO symbol, which indicates to the C program that the system provides a prototype for the usleep() function. Otherwise, it is up to the program to supply one. From d_ustat.U: This variable conditionally defines CWHAS_USTAT if ustat() is available to query file system statistics by dev_t. From vendorarch.U: This variable conditionally defined CWPERL_VENDORARCH. From vendorbin.U: This variable conditionally defines CWPERL_VENDORBIN. From vendorlib.U: This variable conditionally defines CWPERL_VENDORLIB. From vendorscript.U: This variable conditionally defines CWPERL_VENDORSCRIPT. From d_vfork.U: This variable conditionally defines the CWHAS_VFORK symbol, which indicates the vfork() routine is available. From d_closedir.U: This variable conditionally defines CWVOID_CLOSEDIR if closedir() does not return a value. From d_voidsig.U: This variable conditionally defines CWVOIDSIG if this system declares void (*signal(...))() in signal.h. The old way was to declare it as int (*signal(...))(). From i_sysioctl.U: This variable conditionally defines CWUSE_IOCNOTTY to indicate that the ioctl() call with CWTIOCNOTTY should be used to void tty association. Otherwise (on CWUSG probably), it is enough to close the standard file decriptors and do a setpgrp(). From d_volatile.U: This variable conditionally defines the CWHASVOLATILE symbol, which indicates to the C program that this C compiler knows about the volatile declaration. From d_vprintf.U: This variable conditionally defines the CWHAS_VPRINTF symbol, which indicates to the C program that the vprintf() routine is available to printf with a pointer to an argument list. From d_wait4.U: This variable conditionally defines the HAS_WAIT4 symbol, which indicates the wait4() routine is available. From d_waitpid.U: This variable conditionally defines CWHAS_WAITPID if waitpid() is available to wait for child process. From d_wcstombs.U: This variable conditionally defines the CWHAS_WCSTOMBS symbol, which indicates to the C program that the wcstombs() routine is available to convert wide character strings to multibyte strings. From d_wctomb.U: This variable conditionally defines the CWHAS_WCTOMB symbol, which indicates to the C program that the wctomb() routine is available to convert a wide character to a multibyte. From d_writev.U: This variable conditionally defines the CWHAS_WRITEV symbol, which indicates to the C program that the writev() routine is available. From Guess.U: This variable conditionally defines the symbol CWXENIX, which alerts the C program that it runs under Xenix. From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the date program. After Configure runs, the value is reset to a plain CWdate and is not useful. From i_db.U: This variable contains the type of the hash structure element in the <db.h> header file. In older versions of CWDB, it was int, while in newer ones it is u_int32_t. From i_db.U: This variable contains the type of the prefix structure element in the <db.h> header file. In older versions of CWDB, it was int, while in newer ones it is size_t. From i_db.U: This variable contains the major version number of Berkeley CWDB found in the <db.h> header file. From i_db.U: This variable contains the minor version number of Berkeley CWDB found in the <db.h> header file. For CWDB version 1 this is always 0. From i_db.U: This variable contains the patch version number of Berkeley CWDB found in the <db.h> header file. For CWDB version 1 this is always 0. From voidflags.U: This variable contains the default value of the CWVOIDUSED symbol (15). From i_dirent.U: This symbol is set to CWstruct direct or CWstruct dirent depending on whether dirent is available or not. You should use this pseudo type to portably declare your directory entries. From dlext.U: This variable contains the extension that is to be used for the dynamically loaded modules that perl generaties. From dlsrc.U: This variable contains the name of the dynamic loading file that will be used with the package. From doublesize.U: This variable contains the value of the CWDOUBLESIZE symbol, which indicates to the C program how many bytes there are in a double. From randfunc.U: Indicates the macro to be used to generate normalized random numbers. Uses randfunc, often divided by (double) (((unsigned long) 1 << randbits)) in order to normalize the result. In C programs, the macro CWDrand01 is mapped to drand01. From d_drand48_r.U: This variable encodes the prototype of drand48_r. It is zero if d_drand48_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_drand48_r is defined. From Extensions.U: This variable holds a list of CWXS extension files we want to link dynamically into the package. It is used by Makefile.

From nblock_io.U: This variable bears the symbolic errno code set by read() when no data is present on the file and non-blocking I/O was enabled (otherwise, read() blocks naturally). From ebcdic.U: This variable conditionally defines CWEBCDIC if this system uses CWEBCDIC encoding. Among other things, this means that the character ranges are not contiguous. See trnl.U From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the echo program. After Configure runs, the value is reset to a plain CWecho and is not useful. From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the egrep program. After Configure runs, the value is reset to a plain CWegrep and is not useful. From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful. From d_endgrent_r.U: This variable encodes the prototype of endgrent_r. It is zero if d_endgrent_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_endgrent_r is defined. From d_endhostent_r.U: This variable encodes the prototype of endhostent_r. It is zero if d_endhostent_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_endhostent_r is defined. From d_endnetent_r.U: This variable encodes the prototype of endnetent_r. It is zero if d_endnetent_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_endnetent_r is defined. From d_endprotoent_r.U: This variable encodes the prototype of endprotoent_r. It is zero if d_endprotoent_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_endprotoent_r is defined. From d_endpwent_r.U: This variable encodes the prototype of endpwent_r. It is zero if d_endpwent_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_endpwent_r is defined. From d_endservent_r.U: This variable encodes the prototype of endservent_r. It is zero if d_endservent_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_endservent_r is defined. From Init.U: When running under Eunice this variable contains a command which will convert a shell script to the proper form of text file for it to be executable by the shell. On other systems it is a no-op. From Unix.U: This is an old synonym for _exe. From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the expr program. After Configure runs, the value is reset to a plain CWexpr and is not useful. From Extensions.U: This variable holds a list of all extension files (both CWXS and non-xs linked into the package. It is propagated to Config.pm and is typically used to test whether a particular extesion is available. From Extras.U: This variable holds a list of extra modules to install.

From fflushall.U: This symbol, if defined, tells that to flush all pending stdio output one must loop through all the stdio file handles stored in an array and fflush them. Note that if fflushNULL is defined, fflushall will not even be probed for and will be left undefined. From fflushall.U: This symbol, if defined, tells that fflush(CWNULL) does flush all pending stdio output. From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful. From Unix.U: This variable defines the first file searched by make. On unix, it is makefile (then Makefile). On case-insensitive systems, it might be something else. This is only used to deal with convoluted make depend tricks. From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful. From fpossize.U: This variable contains the size of a fpostype in bytes. From fpostype.U: This variable defines Fpos_t to be something like fpos_t, long, uint, or whatever type is used to declare file positions in libc. From mallocsrc.U: This variable contains the return type of free(). It is usually void, but occasionally int. From Cross.U: This variable contains the command used by Configure to copy files from the target host. Useful and available only during Perl build. The string CW: if not cross-compiling. From Loc_ar.U: This variable contains the full pathname to CWar, whether or not the user has specified CWportability. This is only used in the Makefile.SH. From d_csh.U: This variable contains the full pathname to CWcsh, whether or not the user has specified CWportability. This is only used in the compiled C program, and we assume that all systems which can share this executable will have the same full pathname to csh. From Loc_sed.U: This variable contains the full pathname to CWsed, whether or not the user has specified CWportability. This is only used in the compiled C program, and we assume that all systems which can share this executable will have the same full pathname to sed.

From gccvers.U: If CWGNU cc (gcc) is used, this variable will enable (if set) the -ansi and -pedantic ccflags for building core files (through cflags script). (See Porting/pumpkin.pod for full description). From gccvers.U: If CWGNU cc (gcc) is used, this variable holds the operating system and version used to compile gcc. It is set to '' if not gcc, or if nothing useful can be parsed as the os version. From gccvers.U: If CWGNU cc (gcc) is used, this variable holds CW1 or CW2 to indicate whether the compiler is version 1 or 2. This is used in setting some of the default cflags. It is set to '' if not gcc. From d_getgrent_r.U: This variable encodes the prototype of getgrent_r. It is zero if d_getgrent_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_getgrent_r is defined. From d_getgrgid_r.U: This variable encodes the prototype of getgrgid_r. It is zero if d_getgrgid_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_getgrgid_r is defined. From d_getgrnam_r.U: This variable encodes the prototype of getgrnam_r. It is zero if d_getgrnam_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_getgrnam_r is defined. From d_gethostbyaddr_r.U: This variable encodes the prototype of gethostbyaddr_r. It is zero if d_gethostbyaddr_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_gethostbyaddr_r is defined. From d_gethostbyname_r.U: This variable encodes the prototype of gethostbyname_r. It is zero if d_gethostbyname_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_gethostbyname_r is defined. From d_gethostent_r.U: This variable encodes the prototype of gethostent_r. It is zero if d_gethostent_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_gethostent_r is defined. From d_getlogin_r.U: This variable encodes the prototype of getlogin_r. It is zero if d_getlogin_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_getlogin_r is defined. From d_getnetbyaddr_r.U: This variable encodes the prototype of getnetbyaddr_r. It is zero if d_getnetbyaddr_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_getnetbyaddr_r is defined. From d_getnetbyname_r.U: This variable encodes the prototype of getnetbyname_r. It is zero if d_getnetbyname_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_getnetbyname_r is defined. From d_getnetent_r.U: This variable encodes the prototype of getnetent_r. It is zero if d_getnetent_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_getnetent_r is defined. From d_getprotobyname_r.U: This variable encodes the prototype of getprotobyname_r. It is zero if d_getprotobyname_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_getprotobyname_r is defined. From d_getprotobynumber_r.U: This variable encodes the prototype of getprotobynumber_r. It is zero if d_getprotobynumber_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_getprotobynumber_r is defined. From d_getprotoent_r.U: This variable encodes the prototype of getprotoent_r. It is zero if d_getprotoent_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_getprotoent_r is defined. From d_getpwent_r.U: This variable encodes the prototype of getpwent_r. It is zero if d_getpwent_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_getpwent_r is defined. From d_getpwnam_r.U: This variable encodes the prototype of getpwnam_r. It is zero if d_getpwnam_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_getpwnam_r is defined. From d_getpwuid_r.U: This variable encodes the prototype of getpwuid_r. It is zero if d_getpwuid_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_getpwuid_r is defined. From d_getservbyname_r.U: This variable encodes the prototype of getservbyname_r. It is zero if d_getservbyname_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_getservbyname_r is defined. From d_getservbyport_r.U: This variable encodes the prototype of getservbyport_r. It is zero if d_getservbyport_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_getservbyport_r is defined. From d_getservent_r.U: This variable encodes the prototype of getservent_r. It is zero if d_getservent_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_getservent_r is defined. From d_getspnam_r.U: This variable encodes the prototype of getspnam_r. It is zero if d_getspnam_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_getspnam_r is defined. From gidf.U: This variable contains the format string used for printing a Gid_t. From gidsign.U: This variable contains the signedness of a gidtype. 1 for unsigned, -1 for signed. From gidsize.U: This variable contains the size of a gidtype in bytes. From gidtype.U: This variable defines Gid_t to be something like gid_t, int, ushort, or whatever type is used to declare the return type of getgid(). Typically, it is the type of group ids in the kernel. From libpth.U: This variable holds the general path (space-separated) used to find libraries. It may contain directories that do not exist on this platform, libpth is the cleaned-up version. From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the gmake program. After Configure runs, the value is reset to a plain CWgmake and is not useful. From d_gmtime_r.U: This variable encodes the prototype of gmtime_r. It is zero if d_gmtime_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_gmtime_r is defined. From d_gnulibc.U: This variable contains the version number of the CWGNU C library. It is usually something like 2.2.5. It is a plain '' if this is not the CWGNU C library, or if the version is unknown. From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the grep program. After Configure runs, the value is reset to a plain CWgrep and is not useful. From nis.U: This variable contains a command that produces the text of the /etc/group file. This is normally "cat /etc/group, but can be ypcat group" when CWNIS is used. On some systems, such as os390, there may be no equivalent command, in which case this variable is unset. From groupstype.U: This variable defines Groups_t to be something like gid_t, int, ushort, or whatever type is used for the second argument to getgroups() and setgroups(). Usually, this is the same as gidtype (gid_t), but sometimes it isn't. From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the gzip program. After Configure runs, the value is reset to a plain CWgzip and is not useful.

From h_fcntl.U: This is variable gets set in various places to tell i_fcntl that <fcntl.h> should be included. From h_sysfile.U: This is variable gets set in various places to tell i_sys_file that <sys/file.h> should be included. From Oldconfig.U: Gives the type of hints used for previous answers. May be one of CWdefault, CWrecommended or CWprevious. From nis.U: This variable contains a command that produces the text of the /etc/hosts file. This is normally "cat /etc/hosts, but can be ypcat hosts" when CWNIS is used. On some systems, such as os390, there may be no equivalent command, in which case this variable is unset. From html1dir.U: This variable contains the name of the directory in which html source pages are to be put. This directory is for pages that describe whole programs, not libraries or modules. It is intended to correspond roughly to section 1 of the Unix manuals. From html1dir.U: This variable is the same as the html1dir variable, but is filename expanded at configuration time, for convenient use in makefiles. From html3dir.U: This variable contains the name of the directory in which html source pages are to be put. This directory is for pages that describe libraries or modules. It is intended to correspond roughly to section 3 of the Unix manuals. From html3dir.U: This variable is the same as the html3dir variable, but is filename expanded at configuration time, for convenient use in makefiles.

From perlxv.U: This variable is the size of an I16 in bytes. From perlxv.U: This variable contains the C type used for Perl's I16. From perlxv.U: This variable is the size of an I32 in bytes. From perlxv.U: This variable contains the C type used for Perl's I32. From perlxv.U: This variable is the size of an I64 in bytes. From perlxv.U: This variable contains the C type used for Perl's I64. From perlxv.U: This variable is the size of an I8 in bytes. From perlxv.U: This variable contains the C type used for Perl's I8. From i_arpainet.U: This variable conditionally defines the CWI_ARPA_INET symbol, and indicates whether a C program should include <arpa/inet.h>. From i_sysioctl.U: This variable conditionally defines the CWI_SYS_BSDIOCTL symbol, which indicates to the C program that <sys/bsdioctl.h> exists and should be included. From i_crypt.U: This variable conditionally defines the CWI_CRYPT symbol, and indicates whether a C program should include <crypt.h>. From i_db.U: This variable conditionally defines the CWI_DB symbol, and indicates whether a C program may include Berkeley's CWDB include file <db.h>. From i_dbm.U: This variable conditionally defines the CWI_DBM symbol, which indicates to the C program that <dbm.h> exists and should be included. From i_dirent.U: This variable conditionally defines CWI_DIRENT, which indicates to the C program that it should include <dirent.h>. From i_dld.U: This variable conditionally defines the CWI_DLD symbol, which indicates to the C program that <dld.h> (CWGNU dynamic loading) exists and should be included. From i_dlfcn.U: This variable conditionally defines the CWI_DLFCN symbol, which indicates to the C program that <dlfcn.h> exists and should be included. From i_fcntl.U: This variable controls the value of CWI_FCNTL (which tells the C program to include <fcntl.h>). From i_float.U: This variable conditionally defines the CWI_FLOAT symbol, and indicates whether a C program may include <float.h> to get symbols like CWDBL_MAX or CWDBL_MIN, i.e. machine dependent floating point values. From i_fp.U: This variable conditionally defines the CWI_FP symbol, and indicates whether a C program should include <fp.h>. From i_fp_class.U: This variable conditionally defines the CWI_FP_CLASS symbol, and indicates whether a C program should include <fp_class.h>. From i_gdbm.U: This variable conditionally defines the CWI_GDBM symbol, which indicates to the C program that <gdbm.h> exists and should be included. From i_grp.U: This variable conditionally defines the CWI_GRP symbol, and indicates whether a C program should include <grp.h>. From i_ieeefp.U: This variable conditionally defines the CWI_IEEEFP symbol, and indicates whether a C program should include <ieeefp.h>. From i_inttypes.U: This variable conditionally defines the CWI_INTTYPES symbol, and indicates whether a C program should include <inttypes.h>. From i_langinfo.U: This variable conditionally defines the CWI_LANGINFO symbol, and indicates whether a C program should include <langinfo.h>. From i_libutil.U: This variable conditionally defines the CWI_LIBUTIL symbol, and indicates whether a C program should include <libutil.h>. From i_limits.U: This variable conditionally defines the CWI_LIMITS symbol, and indicates whether a C program may include <limits.h> to get symbols like CWWORD_BIT and friends. From i_locale.U: This variable conditionally defines the CWI_LOCALE symbol, and indicates whether a C program should include <locale.h>. From i_machcthr.U: This variable conditionally defines the CWI_MACH_CTHREADS symbol, and indicates whether a C program should include <mach/cthreads.h>. From i_malloc.U: This variable conditionally defines the CWI_MALLOC symbol, and indicates whether a C program should include <malloc.h>. From i_math.U: This variable conditionally defines the CWI_MATH symbol, and indicates whether a C program may include <math.h>. From i_memory.U: This variable conditionally defines the CWI_MEMORY symbol, and indicates whether a C program should include <memory.h>. From i_mntent.U: This variable conditionally defines the CWI_MNTENT symbol, and indicates whether a C program should include <mntent.h>. From i_ndbm.U: This variable conditionally defines the CWI_NDBM symbol, which indicates to the C program that <ndbm.h> exists and should be included. From i_netdb.U: This variable conditionally defines the CWI_NETDB symbol, and indicates whether a C program should include <netdb.h>. From i_neterrno.U: This variable conditionally defines the CWI_NET_ERRNO symbol, which indicates to the C program that <net/errno.h> exists and should be included. From i_netinettcp.U: This variable conditionally defines the CWI_NETINET_TCP symbol, and indicates whether a C program should include <netinet/tcp.h>. From i_niin.U: This variable conditionally defines CWI_NETINET_IN, which indicates to the C program that it should include <netinet/in.h>. Otherwise, you may try <sys/in.h>. From i_poll.U: This variable conditionally defines the CWI_POLL symbol, and indicates whether a C program should include <poll.h>. From i_prot.U: This variable conditionally defines the CWI_PROT symbol, and indicates whether a C program should include <prot.h>. From i_pthread.U: This variable conditionally defines the CWI_PTHREAD symbol, and indicates whether a C program should include <pthread.h>. From i_pwd.U: This variable conditionally defines CWI_PWD, which indicates to the C program that it should include <pwd.h>. From i_dbm.U: This variable conditionally defines the CWI_RPCSVC_DBM symbol, which indicates to the C program that <rpcsvc/dbm.h> exists and should be included. Some System V systems might need this instead of <dbm.h>. From i_sfio.U: This variable conditionally defines the CWI_SFIO symbol, and indicates whether a C program should include <sfio.h>. From i_termio.U: This variable conditionally defines the CWI_SGTTY symbol, which indicates to the C program that it should include <sgtty.h> rather than <termio.h>. From i_shadow.U: This variable conditionally defines the CWI_SHADOW symbol, and indicates whether a C program should include <shadow.h>. From i_socks.U: This variable conditionally defines the CWI_SOCKS symbol, and indicates whether a C program should include <socks.h>. From i_varhdr.U: This variable conditionally defines the CWI_STDARG symbol, which indicates to the C program that <stdarg.h> exists and should be included. From i_stddef.U: This variable conditionally defines the CWI_STDDEF symbol, which indicates to the C program that <stddef.h> exists and should be included. From i_stdlib.U: This variable conditionally defines the CWI_STDLIB symbol, which indicates to the C program that <stdlib.h> exists and should be included. From i_string.U: This variable conditionally defines the CWI_STRING symbol, which indicates that <string.h> should be included rather than <strings.h>. From i_sunmath.U: This variable conditionally defines the CWI_SUNMATH symbol, and indicates whether a C program should include <sunmath.h>. From i_sysaccess.U: This variable conditionally defines the CWI_SYS_ACCESS symbol, and indicates whether a C program should include <sys/access.h>. From i_sysdir.U: This variable conditionally defines the CWI_SYS_DIR symbol, and indicates whether a C program should include <sys/dir.h>. From i_sysfile.U: This variable conditionally defines the CWI_SYS_FILE symbol, and indicates whether a C program should include <sys/file.h> to get CWR_OK and friends. From i_sysioctl.U: This variable conditionally defines the CWI_SYS_FILIO symbol, which indicates to the C program that <sys/filio.h> exists and should be included in preference to <sys/ioctl.h>. From i_niin.U: This variable conditionally defines CWI_SYS_IN, which indicates to the C program that it should include <sys/in.h> instead of <netinet/in.h>. From i_sysioctl.U: This variable conditionally defines the CWI_SYS_IOCTL symbol, which indicates to the C program that <sys/ioctl.h> exists and should be included. From i_syslog.U: This variable conditionally defines the CWI_SYSLOG symbol, and indicates whether a C program should include <syslog.h>. From i_sysmman.U: This variable conditionally defines the CWI_SYS_MMAN symbol, and indicates whether a C program should include <sys/mman.h>. From i_sysmode.U: This variable conditionally defines the CWI_SYSMODE symbol, and indicates whether a C program should include <sys/mode.h>. From i_sysmount.U: This variable conditionally defines the CWI_SYSMOUNT symbol, and indicates whether a C program should include <sys/mount.h>. From i_sysndir.U: This variable conditionally defines the CWI_SYS_NDIR symbol, and indicates whether a C program should include <sys/ndir.h>. From i_sysparam.U: This variable conditionally defines the CWI_SYS_PARAM symbol, and indicates whether a C program should include <sys/param.h>. From i_sysresrc.U: This variable conditionally defines the CWI_SYS_RESOURCE symbol, and indicates whether a C program should include <sys/resource.h>. From i_syssecrt.U: This variable conditionally defines the CWI_SYS_SECURITY symbol, and indicates whether a C program should include <sys/security.h>. From i_sysselct.U: This variable conditionally defines CWI_SYS_SELECT, which indicates to the C program that it should include <sys/select.h> in order to get the definition of struct timeval. From i_sysioctl.U: This variable conditionally defines CWI_SYS_SOCKIO to indicate to the C program that socket ioctl codes may be found in <sys/sockio.h> instead of <sys/ioctl.h>. From i_sysstat.U: This variable conditionally defines the CWI_SYS_STAT symbol, and indicates whether a C program should include <sys/stat.h>. From i_sysstatfs.U: This variable conditionally defines the CWI_SYSSTATFS symbol, and indicates whether a C program should include <sys/statfs.h>. From i_sysstatvfs.U: This variable conditionally defines the CWI_SYSSTATVFS symbol, and indicates whether a C program should include <sys/statvfs.h>. From i_time.U: This variable conditionally defines CWI_SYS_TIME, which indicates to the C program that it should include <sys/time.h>. From i_time.U: This variable conditionally defines CWI_SYS_TIME_KERNEL, which indicates to the C program that it should include <sys/time.h> with CWKERNEL defined. From i_systimes.U: This variable conditionally defines the CWI_SYS_TIMES symbol, and indicates whether a C program should include <sys/times.h>. From i_systypes.U: This variable conditionally defines the CWI_SYS_TYPES symbol, and indicates whether a C program should include <sys/types.h>. From i_sysuio.U: This variable conditionally defines the CWI_SYSUIO symbol, and indicates whether a C program should include <sys/uio.h>. From i_sysun.U: This variable conditionally defines CWI_SYS_UN, which indicates to the C program that it should include <sys/un.h> to get CWUNIX domain socket definitions. From i_sysutsname.U: This variable conditionally defines the CWI_SYSUTSNAME symbol, and indicates whether a C program should include <sys/utsname.h>. From i_sysvfs.U: This variable conditionally defines the CWI_SYSVFS symbol, and indicates whether a C program should include <sys/vfs.h>. From i_syswait.U: This variable conditionally defines CWI_SYS_WAIT, which indicates to the C program that it should include <sys/wait.h>. From i_termio.U: This variable conditionally defines the CWI_TERMIO symbol, which indicates to the C program that it should include <termio.h> rather than <sgtty.h>. From i_termio.U: This variable conditionally defines the CWI_TERMIOS symbol, which indicates to the C program that the CWPOSIX <termios.h> file is to be included. From i_time.U: This variable conditionally defines CWI_TIME, which indicates to the C program that it should include <time.h>. From i_unistd.U: This variable conditionally defines the CWI_UNISTD symbol, and indicates whether a C program should include <unistd.h>. From i_ustat.U: This variable conditionally defines the CWI_USTAT symbol, and indicates whether a C program should include <ustat.h>. From i_utime.U: This variable conditionally defines the CWI_UTIME symbol, and indicates whether a C program should include <utime.h>. From i_values.U: This variable conditionally defines the CWI_VALUES symbol, and indicates whether a C program may include <values.h> to get symbols like CWMAXLONG and friends. From i_varhdr.U: This variable conditionally defines CWI_VARARGS, which indicates to the C program that it should include <varargs.h>. From i_varhdr.U: Contains the name of the header to be included to get va_dcl definition. Typically one of varargs.h or stdarg.h. From i_vfork.U: This variable conditionally defines the CWI_VFORK symbol, and indicates whether a C program should include vfork.h. From libs.U: This variable should be non-empty if non-versioned shared libraries (libfoo.so.x.y) are to be ignored (because they cannot be linked against). From inc_version_list.U: This variable specifies the list of subdirectories in over which perl.c:incpush() and lib/lib.pm will automatically search when adding directories to @CWINC. The elements in the list are separated by spaces. This is only useful if you have a perl library directory tree structured like the default one. See CWINSTALL for how this works. The versioned site_perl directory was introduced in 5.005, so that is the lowest possible value. From inc_version_list.U: This variable holds the same list as inc_version_list, but each item is enclosed in double quotes and separated by commas, suitable for use in the CWPERL_INC_VERSION_LIST initialization. From usrinc.U: This variable must preceed the normal include path to get hte right one, as in $incpath/usr/include or $incpath/usr/lib. Value can be "" or /bsd43 on mips. From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful. From archlib.U: This variable is really the same as archlibexp but may differ on those systems using CWAFS. For extra portability, only this variable should be used in makefiles. From bin.U: This variable is the same as binexp unless CWAFS is running in which case the user is explicitely prompted for it. This variable should always be used in your makefiles for maximum portability. From html1dir.U: This variable is really the same as html1direxp, unless you are using a different installprefix. For extra portability, you should only use this variable within your makefiles. From html3dir.U: This variable is really the same as html3direxp, unless you are using a different installprefix. For extra portability, you should only use this variable within your makefiles. From man1dir.U: This variable is really the same as man1direxp, unless you are using CWAFS in which case it points to the read/write location whereas man1direxp only points to the read-only access location. For extra portability, you should only use this variable within your makefiles. From man3dir.U: This variable is really the same as man3direxp, unless you are using CWAFS in which case it points to the read/write location whereas man3direxp only points to the read-only access location. For extra portability, you should only use this variable within your makefiles. From installprefix.U: This variable holds the name of the directory below which make install will install the package. For most users, this is the same as prefix. However, it is useful for installing the software into a different (usually temporary) location after which it can be bundled up and moved somehow to the final location specified by prefix. From installprefix.U: This variable holds the full absolute path of installprefix with all ~-expansion done. From privlib.U: This variable is really the same as privlibexp but may differ on those systems using CWAFS. For extra portability, only this variable should be used in makefiles. From scriptdir.U: This variable is usually the same as scriptdirexp, unless you are on a system running CWAFS, in which case they may differ slightly. You should always use this variable within your makefiles for portability. From sitearch.U: This variable is really the same as sitearchexp but may differ on those systems using CWAFS. For extra portability, only this variable should be used in makefiles. From sitebin.U: This variable is usually the same as sitebinexp, unless you are on a system running CWAFS, in which case they may differ slightly. You should always use this variable within your makefiles for portability. From sitehtml1dir.U: This variable is really the same as sitehtml1direxp, unless you are using CWAFS in which case it points to the read/write location whereas html1direxp only points to the read-only access location. For extra portability, you should only use this variable within your makefiles. From sitehtml3dir.U: This variable is really the same as sitehtml3direxp, unless you are using CWAFS in which case it points to the read/write location whereas html3direxp only points to the read-only access location. For extra portability, you should only use this variable within your makefiles. From sitelib.U: This variable is really the same as sitelibexp but may differ on those systems using CWAFS. For extra portability, only this variable should be used in makefiles. From siteman1dir.U: This variable is really the same as siteman1direxp, unless you are using CWAFS in which case it points to the read/write location whereas man1direxp only points to the read-only access location. For extra portability, you should only use this variable within your makefiles. From siteman3dir.U: This variable is really the same as siteman3direxp, unless you are using CWAFS in which case it points to the read/write location whereas man3direxp only points to the read-only access location. For extra portability, you should only use this variable within your makefiles. From sitescript.U: This variable is usually the same as sitescriptexp, unless you are on a system running CWAFS, in which case they may differ slightly. You should always use this variable within your makefiles for portability. From installstyle.U: This variable describes the CWstyle of the perl installation. This is intended to be useful for tools that need to manipulate entire perl distributions. Perl itself doesn't use this to find its libraries the library directories are stored directly in Config.pm. Currently, there are only two styles: CWlib and lib/perl5. The default library locations (e.g. privlib, sitelib) are either $prefix/lib or $prefix/lib/perl5. The former is useful if CW$prefix is a directory dedicated to perl (e.g. /opt/perl), while the latter is useful if CW$prefix is shared by many packages, e.g. if CW$prefix=/usr/local. Unfortunately, while this CWstyle variable is used to set defaults for all three directory hierarchies (core, vendor, and site), there is no guarantee that the same style is actually appropriate for all those directories. For example, CW$prefix might be /opt/perl, but CW$siteprefix might be /usr/local. (Perhaps, in retrospect, the CWlib style should never have been supported, but it did seem like a nice idea at the time.) The situation is even less clear for tools such as MakeMaker that can be used to install additional modules into non-standard places. For example, if a user intends to install a module into a private directory (perhaps by setting CWPREFIX on the Makefile.PL command line), then there is no reason to assume that the Configure-time CW$installstyle setting will be relevant for that CWPREFIX. This may later be extended to include other information, so be careful with pattern-matching on the results. For compatibility with perl5.005 and earlier, the default setting is based on whether or not CW$prefix contains the string CWperl. From instubperl.U: This variable tells whether Perl should be installed also as /usr/bin/perl in addition to $installbin/perl From vendorarch.U: This variable is really the same as vendorarchexp but may differ on those systems using CWAFS. For extra portability, only this variable should be used in makefiles. From vendorbin.U: This variable is really the same as vendorbinexp but may differ on those systems using CWAFS. For extra portability, only this variable should be used in makefiles. From vendorhtml1dir.U: This variable is really the same as vendorhtml1direxp but may differ on those systems using CWAFS. For extra portability, only this variable should be used in makefiles. From vendorhtml3dir.U: This variable is really the same as vendorhtml3direxp but may differ on those systems using CWAFS. For extra portability, only this variable should be used in makefiles. From vendorlib.U: This variable is really the same as vendorlibexp but may differ on those systems using CWAFS. For extra portability, only this variable should be used in makefiles. From vendorman1dir.U: This variable is really the same as vendorman1direxp but may differ on those systems using CWAFS. For extra portability, only this variable should be used in makefiles. From vendorman3dir.U: This variable is really the same as vendorman3direxp but may differ on those systems using CWAFS. For extra portability, only this variable should be used in makefiles. From vendorscript.U: This variable is really the same as vendorscriptexp but may differ on those systems using CWAFS. For extra portability, only this variable should be used in makefiles. From intsize.U: This variable contains the value of the CWINTSIZE symbol, which indicates to the C program how many bytes there are in an int. From issymlink.U: This variable holds the test command to test for a symbolic link (if they are supported). Typical values include CWtest -h and CWtest -L. From perlxvf.U: This variable contains the format string used for printing a Perl CWIV as a signed decimal integer. From perlxv.U: This variable is the size of an CWIV in bytes. From perlxv.U: This variable contains the C type used for Perl's CWIV.

From Extensions.U: This variable holds a list of all CWXS extensions included in the package. From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful.

From dlsrc.U: This variable indicates the program to be used to link libraries for dynamic loading. On some systems, it is CWld. On CWELF systems, it should be CW$cc. Mostly, we'll try to respect the hint file setting. From dlsrc.U: This variable contains any special flags that might need to be passed to CW$ld to create a shared library suitable for dynamic loading. It is up to the makefile to use it. For hpux, it should be CW-b. For sunos 4.1, it is empty. From ccflags.U: This variable contains any additional C loader flags desired by the user. It is up to the Makefile to use this. From uselfs.U: This variable contains the loader flags needed by large file builds and added to ldflags by hints files. From libperl.U: This variable holds the name of the shared library search path, often CWLD_LIBRARY_PATH. To get an empty string, the hints file must set this to CWnone. From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the less program. After Configure runs, the value is reset to a plain CWless and is not useful. From Unix.U: This is an old synonym for _a. From libc.U: This variable contains the location of the C library. From libperl.U: The perl executable is obtained by linking perlmain.c with libperl, any static extensions (usually just DynaLoader), and any other libraries needed on this system. libperl is usually libperl.a, but can also be libperl.so.xxx if the user wishes to build a perl executable with a shared library. From libpth.U: This variable holds the general path (space-separated) used to find libraries. It is intended to be used by other units. From libs.U: This variable holds the additional libraries we want to use. It is up to the Makefile to deal with it. The list can be empty. From libs.U: This variable holds the directory names aka dirnames of the libraries we found and accepted, duplicates are removed. From libs.U: This variable holds the filenames aka basenames of the libraries we found and accepted. From libs.U: This variable holds the full pathnames of the libraries we found and accepted. From libs.U: This variable holds the directory names probed for libraries. From Myinit.U: This variable holds a list of all the libraries we want to search. The order is chosen to pick up the c library ahead of ucb or bsd libraries for SVR4. From uselfs.U: This variable contains the libraries needed by large file builds and added to ldflags by hints files. It is a space separated list of the library names without the CWlib prefix or any suffix, just like libswanted.. From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful. From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful. From ccflags.U: This variable contains any additional C partial linker flags desired by the user. It is up to the Makefile to use this. From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the ln program. After Configure runs, the value is reset to a plain CWln and is not useful. From lns.U: This variable holds the name of the command to make symbolic links (if they are supported). It can be used in the Makefile. It is either CWln -s or CWln From d_localtime_r.U: This variable encodes the prototype of localtime_r. It is zero if d_localtime_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_localtime_r is defined. From ccflags.U: This variable contains a list of additional directories to be searched by the compiler. The appropriate CW-I directives will be added to ccflags. This is intended to simplify setting local directories from the Configure command line. It's not much, but it parallels the loclibpth stuff in libpth.U. From libpth.U: This variable holds the paths (space-separated) used to find local libraries. It is prepended to libpth, and is intended to be easily set from the command line. From d_longdbl.U: This variable contains the value of the CWLONG_DOUBLESIZE symbol, which indicates to the C program how many bytes there are in a long double, if this system supports long doubles. From d_longlong.U: This variable contains the value of the CWLONGLONGSIZE symbol, which indicates to the C program how many bytes there are in a long long, if this system supports long long. From intsize.U: This variable contains the value of the CWLONGSIZE symbol, which indicates to the C program how many bytes there are in a long. From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful. From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful. From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the ls program. After Configure runs, the value is reset to a plain CWls and is not useful. From lseektype.U: This variable defines lseektype to be something like off_t, long, or whatever type is used to declare lseek offset's type in the kernel (which also appears to be lseek's return type). From lseektype.U: This variable defines lseektype to be something like off_t, long, or whatever type is used to declare lseek offset's type in the kernel (which also appears to be lseek's return type).

From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful. From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful. From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the make program. After Configure runs, the value is reset to a plain CWmake and is not useful. From make.U: Some versions of CWmake set the variable CWMAKE. Others do not. This variable contains the string to be included in Makefile.SH so that CWMAKE is set if needed, and not if not needed. Possible values are: make_set_make=CW# # If your make program handles this for you, make_set_make=CWMAKE=$make # if it doesn't. This uses a comment character to distinguish a CWset value (from a previous config.sh or Configure CW-D option) from an uncomputed value. From mallocsrc.U: This variable contains the name of the malloc.o that this package generates, if that malloc.o is preferred over the system malloc. Otherwise the value is null. This variable is intended for generating Makefiles. See mallocsrc. From mallocsrc.U: This variable contains the name of the malloc.c that comes with the package, if that malloc.c is preferred over the system malloc. Otherwise the value is null. This variable is intended for generating Makefiles. From mallocsrc.U: This variable contains the kind of ptr returned by malloc and realloc. From man1dir.U: This variable contains the name of the directory in which manual source pages are to be put. It is the responsibility of the Makefile.SH to get the value of this into the proper command. You must be prepared to do the ~name expansion yourself. From man1dir.U: This variable is the same as the man1dir variable, but is filename expanded at configuration time, for convenient use in makefiles. From man1dir.U: This variable contains the extension that the manual page should have: one of CWn, CWl, or CW1. The Makefile must supply the .. See man1dir. From man3dir.U: This variable contains the name of the directory in which manual source pages are to be put. It is the responsibility of the Makefile.SH to get the value of this into the proper command. You must be prepared to do the ~name expansion yourself. From man3dir.U: This variable is the same as the man3dir variable, but is filename expanded at configuration time, for convenient use in makefiles. From man3dir.U: This variable contains the extension that the manual page should have: one of CWn, CWl, or CW3. The Makefile must supply the .. See man3dir.

From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the Mcc program. After Configure runs, the value is reset to a plain CWMcc and is not useful. From usrinc.U: This variable holds the environment type for the mips system. Possible values are BSD 4.3 and System V. From Csym.U: This variable can be used to establish a fallthrough for the cases where nm fails to find a symbol. If usenm is false or usenm is true and mistrustnm is false, this variable has no effect. If usenm is true and mistrustnm is CWcompile, a test program will be compiled to try to find any symbol that can't be located via nm lookup. If mistrustnm is CWrun, the test program will be run as well as being compiled. From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the mkdir program. After Configure runs, the value is reset to a plain CWmkdir and is not useful. From d_mmap.U: This symbol contains the type of pointer returned by mmap() (and simultaneously the type of the first argument). It can be CWvoid * or CWcaddr_t. From modetype.U: This variable defines modetype to be something like mode_t, int, unsigned short, or whatever type is used to declare file modes for system calls. From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the more program. After Configure runs, the value is reset to a plain CWmore and is not useful. From multiarch.U: This variable conditionally defines the CWMULTIARCH symbol which signifies the presence of multiplatform files. This is normally set by hints files. From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful. From archname.U: This variable holds the architecture name computed by Configure in a previous run. It is not intended to be perused by any user and should never be set in a hint file. From myhostname.U: This variable contains the eventual value of the CWMYDOMAIN symbol, which is the domain of the host the program is going to run on. The domain must be appended to myhostname to form a complete host name. The dot comes with mydomain, and need not be supplied by the program. From myhostname.U: This variable contains the eventual value of the CWMYHOSTNAME symbol, which is the name of the host the program is going to run on. The domain is not kept with hostname, but must be gotten from mydomain. The dot comes with mydomain, and need not be supplied by the program. From Oldconfig.U: The output of CWuname -a if available, otherwise the hostname. On Xenix, pseudo variables assignments in the output are stripped, thank you. The whole thing is then lower-cased.

From n.U: This variable contains the CW-n flag if that is what causes the echo command to suppress newline. Otherwise it is null. Correct usage is CW$echo CW$n prompt for a question: CW$c. From need_va_copy.U: This symbol, if defined, indicates that the system stores the variable argument list datatype, va_list, in a format that cannot be copied by simple assignment, so that some other means must be used when copying is required. As such systems vary in their provision (or non-provision) of copying mechanisms, handy.h defines a platform- CWindependent macro, Perl_va_copy(src, dst), to do the job. From netdbtype.U: This variable holds the type used for the 2nd argument to gethostbyaddr(). Usually, this is int or size_t or unsigned. This is only useful if you have gethostbyaddr(), naturally. From netdbtype.U: This variable holds the type used for the 1st argument to gethostbyaddr(). Usually, this is char * or void *, possibly with or without a const prefix. This is only useful if you have gethostbyaddr(), naturally. From netdbtype.U: This variable holds the type used for the argument to gethostbyname(). Usually, this is char * or const char *. This is only useful if you have gethostbyname(), naturally. From netdbtype.U: This variable holds the type used for the 1st argument to getnetbyaddr(). Usually, this is int or long. This is only useful if you have getnetbyaddr(), naturally. From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the nm program. After Configure runs, the value is reset to a plain CWnm and is not useful. From usenm.U: This variable holds the options that may be necessary for nm. From usenm.U: This variable holds the options that may be necessary for nm to work on a shared library but that can not be used on an archive library. Currently, this is only used by Linux, where nm --dynamic is *required* to get symbols from an CWELF library which has been stripped, but nm --dynamic is *fatal* on an archive library. Maybe Linux should just always set usenm=false. From Extensions.U: This variable holds a list of all non-xs extensions included in the package. All of them will be built. From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the nroff program. After Configure runs, the value is reset to a plain CWnroff and is not useful. From perlxv.U: This variable indicates how many of bits type uvtype a variable nvtype can preserve. From perlxvf.U: This variable contains the format string used for printing a Perl CWNV using CW%e-ish floating point format. From perlxvf.U: This variable contains the format string used for printing a Perl CWNV using CW%E-ish floating point format. From perlxvf.U: This variable confains the format string used for printing a Perl CWNV using CW%f-ish floating point format. From perlxvf.U: This variable confains the format string used for printing a Perl CWNV using CW%F-ish floating point format. From perlxvf.U: This variable contains the format string used for printing a Perl CWNV using CW%g-ish floating point format. From perlxvf.U: This variable contains the format string used for printing a Perl CWNV using CW%G-ish floating point format. From perlxv.U: This variable is the size of an CWNV in bytes. From perlxv.U: This variable contains the C type used for Perl's CWNV.

From nblock_io.U: This variable bears the symbol value to be used during open() or fcntl() to turn on non-blocking I/O for a file descriptor. If you wish to switch between blocking and non-blocking, you may try ioctl(CWFIOSNBIO) instead, but that is only supported by some devices. From Unix.U: This is an old synonym for _o. From d_pthrattrj.U: This variable defines the constant to use for creating joinable (aka undetached) pthreads. Unused if pthread.h defines CWPTHREAD_CREATE_JOINABLE. If used, possible values are CWPTHREAD_CREATE_UNDETACHED and CW__UNDETACHED. From ccflags.U: This variable contains any optimizer/debugger flag that should be used. It is up to the Makefile to use it. From orderlib.U: This variable is CWtrue if the components of libraries must be ordered (with `lorder $* | tsort`) before placing them in an archive. Set to CWfalse if ranlib or ar can generate random libraries. From Oldconfig.U: This variable contains the operating system name (e.g. sunos, solaris, hpux, etc.). It can be useful later on for setting defaults. Any spaces are replaced with underscores. It is set to a null string if we can't figure it out. From Oldconfig.U: This variable contains the operating system version (e.g. 4.1.3, 5.2, etc.). It is primarily used for helping select an appropriate hints file, but might be useful elsewhere for setting defaults. It is set to '' if we can't figure it out. We try to be flexible about how much of the version number to keep, e.g. if 4.1.1, 4.1.2, and 4.1.3 are essentially the same for this package, hints files might just be os_4.0 or os_4.1, etc., not keeping separate files for each little release. From otherlibdirs.U: This variable contains a colon-separated set of paths for the perl binary to search for additional library files or modules. These directories will be tacked to the end of @CWINC. Perl will automatically search below each path for version- and architecture-specific directories. See inc_version_list for more details. A value of CW means CWnone and is used to preserve this value for the next run through Configure.

From package.U: This variable contains the name of the package being constructed. It is primarily intended for the use of later Configure units. From pager.U: This variable contains the name of the preferred pager on the system. Usual values are (the full pathnames of) more, less, pg, or cat. From nis.U: This variable contains a command that produces the text of the /etc/passwd file. This is normally "cat /etc/passwd, but can be ypcat passwd" when CWNIS is used. On some systems, such as os390, there may be no equivalent command, in which case this variable is unset. From patchlevel.U: The patchlevel level of this package. The value of patchlevel comes from the patchlevel.h file. In a version number such as 5.6.1, this is the CW6. In patchlevel.h, this is referred to as CWPERL_VERSION. From Unix.U: This is an old synonym for p_ in Head.U, the character used to separate elements in the command shell search CWPATH. From perl5.U: This variable contains the full path (if any) to a previously installed perl5.005 or later suitable for running the script to determine inc_version_list. From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful. From patchlevel.U: This is the Perl patch level, a numeric change identifier, as defined by whichever source code maintenance system is used to maintain the patches; currently Perforce. It does not correlate with the Perl version numbers or the maintenance versus development dichotomy except by also being increasing.

From Oldsyms.U: In a Perl version number such as 5.6.2, this is the 5. This value is manually set in patchlevel.h From Oldsyms.U: In a Perl version number such as 5.6.2, this is the 2. Values greater than 50 represent potentially unstable development subversions. This value is manually set in patchlevel.h From Oldsyms.U: In a Perl version number such as 5.6.2, this is the 6. This value is manually set in patchlevel.h From perladmin.U: Electronic mail address of the perl5 administrator. From End.U: The list of libraries needed by Perl only (any libraries needed by extensions only will by dropped, if using dynamic loading). From perlpath.U: This variable contains the eventual value of the CWPERLPATH symbol, which contains the name of the perl interpreter to be used in shell scripts and in the "eval CWexec" idiom. This variable is not necessarily the pathname of the file containing the perl interpreter; you must append the executable extension (_exe) if it is not already present. Note that Perl code that runs during the Perl build process cannot reference this variable, as Perl may not have been installed, or even if installed, may be a different version of Perl. From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the pg program. After Configure runs, the value is reset to a plain CWpg and is not useful. From myhostname.U: This variable contains the eventual value of the CWPHOSTNAME symbol, which is a command that can be fed to popen() to get the host name. The program should probably not presume that the domain is or isn't there already. From pidtype.U: This variable defines CWPIDTYPE to be something like pid_t, int, ushort, or whatever type is used to declare process ids in the kernel. From libpth.U: Holds the private path used by Configure to find out the libraries. Its value is prepend to libpth. This variable takes care of special machines, like the mips. Usually, it should be empty. From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful. From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful. From prefix.U: This variable holds the name of the directory below which the user will install the package. Usually, this is /usr/local, and executables go in /usr/local/bin, library stuff in /usr/local/lib, man pages in /usr/local/man, etc. It is only used to set defaults for things in bin.U, mansrc.U, privlib.U, or scriptdir.U. From prefix.U: This variable holds the full absolute path of the directory below which the user will install the package. Derived from prefix. From privlib.U: This variable contains the eventual value of the CWPRIVLIB symbol, which is the name of the private library for this package. It may have a ~ on the front. It is up to the makefile to eventually create this directory while performing installation (with ~ substitution). From privlib.U: This variable is the ~name expanded version of privlib, so that you may use it directly in Makefiles or shell scripts. From d_procselfexe.U: If d_procselfexe is defined, CW$procselfexe is the filename of the symbolic link pointing to the absolute pathname of the executing program. From prototype.U: This variable holds the eventual value of CWCAN_PROTOTYPE, which indicates the C compiler can handle funciton prototypes. From ptrsize.U: This variable contains the value of the CWPTRSIZE symbol, which indicates to the C program how many bytes there are in a pointer.

From quadtype.U: This variable, if defined, encodes the type of a quad: 1 = int, 2 = long, 3 = long long, 4 = int64_t. From quadtype.U: This variable defines Quad_t to be something like long, int, long long, int64_t, or whatever type is used for 64-bit integers.

From randfunc.U: Indicates how many bits are produced by the function used to generate normalized random numbers. From randfunc.U: Indicates the name of the random number function to use. Values include drand48, random, and rand. In C programs, the CWDrand01 macro is defined to generate uniformly distributed random numbers over the range [0., 1.[ (see drand01 and nrand). From d_random_r.U: This variable encodes the prototype of random_r. It is zero if d_random_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_random_r is defined. From randfunc.U: Indicates the type of the argument of the seedfunc. From orderlib.U: This variable is set to the pathname of the ranlib program, if it is needed to generate random libraries. Set to CW: if ar can generate random libraries or if random libraries are not supported From nblock_io.U: This variable holds the return code from read() when no data is present. It should be -1, but some systems return 0 when CWO_NDELAY is used, which is a shame because you cannot make the difference between no data and an EOF.. Sigh! From d_readdir64_r.U: This variable encodes the prototype of readdir64_r. It is zero if d_readdir64_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_readdir64_r is defined. From d_readdir_r.U: This variable encodes the prototype of readdir_r. It is zero if d_readdir_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_readdir_r is defined. From patchlevel.U: The value of revision comes from the patchlevel.h file. In a version number such as 5.6.1, this is the CW5. In patchlevel.h, this is referred to as CWPERL_REVISION. From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the rm program. After Configure runs, the value is reset to a plain CWrm and is not useful. From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful. From Cross.U: This variable contains the command used by Configure to copy and execute a cross-compiled executable in the target host. Useful and available only during Perl build. Empty string '' if not cross-compiling. From usenm.U: This variable contains CWtrue or CWfalse depending whether the nm extraction should be performed or not, according to the value of usenm and the flags on the Configure command line.

From d_pthread_y.U: This variable defines the way to yield the execution of the current thread. From scriptdir.U: This variable holds the name of the directory in which the user wants to put publicly scripts for the package in question. It is either the same directory as for binaries, or a special one that can be mounted across different architectures, like /usr/share. Programs must be prepared to deal with ~name expansion. From scriptdir.U: This variable is the same as scriptdir, but is filename expanded at configuration time, for programs not wanting to bother with it. From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the sed program. After Configure runs, the value is reset to a plain CWsed and is not useful. From randfunc.U: Indicates the random number generating seed function. Values include srand48, srandom, and srand. From selectminbits.U: This variable holds the minimum number of bits operated by select. That is, if you do select(n, ...), how many bits at least will be cleared in the masks if some activity is detected. Usually this is either n or 32*ceil(n/32), especially many little-endians do the latter. This is only useful if you have select(), naturally. From selecttype.U: This variable holds the type used for the 2nd, 3rd, and 4th arguments to select. Usually, this is CWfd_set *, if CWHAS_FD_SET is defined, and CWint * otherwise. This is only useful if you have select(), naturally. From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful. From d_setgrent_r.U: This variable encodes the prototype of setgrent_r. It is zero if d_setgrent_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_setgrent_r is defined. From d_sethostent_r.U: This variable encodes the prototype of sethostent_r. It is zero if d_sethostent_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_sethostent_r is defined. From d_setlocale_r.U: This variable encodes the prototype of setlocale_r. It is zero if d_setlocale_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_setlocale_r is defined. From d_setnetent_r.U: This variable encodes the prototype of setnetent_r. It is zero if d_setnetent_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_setnetent_r is defined. From d_setprotoent_r.U: This variable encodes the prototype of setprotoent_r. It is zero if d_setprotoent_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_setprotoent_r is defined. From d_setpwent_r.U: This variable encodes the prototype of setpwent_r. It is zero if d_setpwent_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_setpwent_r is defined. From d_setservent_r.U: This variable encodes the prototype of setservent_r. It is zero if d_setservent_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_setservent_r is defined. From sh.U: This variable contains the full pathname of the shell used on this system to execute Bourne shell scripts. Usually, this will be /bin/sh, though it's possible that some systems will have /bin/ksh, /bin/pdksh, /bin/ash, /bin/bash, or even something such as D:/bin/sh.exe. This unit comes before Options.U, so you can't set sh with a CW-D option, though you can override this (and startsh) with CW-O -Dsh=CI/bin/whateverCW -Dstartsh=whatever From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful. From spitshell.U: This variable contains the string #! if this system supports that construct. From d_shmat.U: This symbol contains the type of pointer returned by shmat(). It can be CWvoid * or CWchar *. From intsize.U: This variable contains the value of the CWSHORTSIZE symbol which indicates to the C program how many bytes there are in a short. From libperl.U: If the user builds a shared libperl.so, then we need to tell the CWperl executable where it will be able to find the installed libperl.so. One way to do this on some systems is to set the environment variable CWLD_RUN_PATH to the directory that will be the final location of the shared libperl.so. The makefile can use this with something like CW$shrpenv $(CWCC) -o perl perlmain.o CW$libperl CW$libs Typical values are shrpenv="env CWLD_RUN_PATH=$archlibexp/CICORE" or shrpenv='' See the main perl Makefile.SH for actual working usage. Alternatively, we might be able to use a command line option such as -R $archlibexp/CICORE (Solaris) or -Wl,-rpath $archlibexp/CICORE (Linux). From spitshell.U: This variable tells further Configure units whether your sh can handle # comments. From sig_name.U: This variable holds a number larger than the largest valid signal number. This is usually the same as the CWNSIG macro. From sig_name.U: This variable holds the signal names, space separated. The leading CWSIG in signal name is removed. A CWZERO is prepended to the list. This is currently not used, sig_name_init is used instead. From sig_name.U: This variable holds the signal names, enclosed in double quotes and separated by commas, suitable for use in the CWSIG_NAME definition below. A CWZERO is prepended to the list, and the list is terminated with a plain 0. The leading CWSIG in signal names is removed. See sig_num. From sig_name.U: This variable holds the signal numbers, space separated. A CWZERO is prepended to the list (corresponding to the fake CWSIGZERO). Those numbers correspond to the value of the signal listed in the same place within the sig_name list. This is currently not used, sig_num_init is used instead. From sig_name.U: This variable holds the signal numbers, enclosed in double quotes and separated by commas, suitable for use in the CWSIG_NUM definition below. A CWZERO is prepended to the list, and the list is terminated with a plain 0. From sig_name.U: This variable contains the number of elements of the sig_name and sig_num arrays. From d_voidsig.U: This variable holds the type of the signal handler (void or int). From sitearch.U: This variable contains the eventual value of the CWSITEARCH symbol, which is the name of the private library for this package. It may have a ~ on the front. It is up to the makefile to eventually create this directory while performing installation (with ~ substitution). The standard distribution will put nothing in this directory. After perl has been installed, users may install their own local architecture-dependent modules in this directory with MakeMaker Makefile.PL or equivalent. See CWINSTALL for details. From sitearch.U: This variable is the ~name expanded version of sitearch, so that you may use it directly in Makefiles or shell scripts. From sitebin.U: This variable holds the name of the directory in which the user wants to put add-on publicly executable files for the package in question. It is most often a local directory such as /usr/local/bin. Programs using this variable must be prepared to deal with ~name substitution. The standard distribution will put nothing in this directory. After perl has been installed, users may install their own local executables in this directory with MakeMaker Makefile.PL or equivalent. See CWINSTALL for details. From sitebin.U: This is the same as the sitebin variable, but is filename expanded at configuration time, for use in your makefiles. From sitehtml1dir.U: This variable contains the name of the directory in which site-specific html source pages are to be put. It is the responsibility of the Makefile.SH to get the value of this into the proper command. You must be prepared to do the ~name expansion yourself. The standard distribution will put nothing in this directory. After perl has been installed, users may install their own local html pages in this directory with MakeMaker Makefile.PL or equivalent. See CWINSTALL for details. From sitehtml1dir.U: This variable is the same as the sitehtml1dir variable, but is filename expanded at configuration time, for convenient use in makefiles. From sitehtml3dir.U: This variable contains the name of the directory in which site-specific library html source pages are to be put. It is the responsibility of the Makefile.SH to get the value of this into the proper command. You must be prepared to do the ~name expansion yourself. The standard distribution will put nothing in this directory. After perl has been installed, users may install their own local library html pages in this directory with MakeMaker Makefile.PL or equivalent. See CWINSTALL for details. From sitehtml3dir.U: This variable is the same as the sitehtml3dir variable, but is filename expanded at configuration time, for convenient use in makefiles. From sitelib.U: This variable contains the eventual value of the CWSITELIB symbol, which is the name of the private library for this package. It may have a ~ on the front. It is up to the makefile to eventually create this directory while performing installation (with ~ substitution). The standard distribution will put nothing in this directory. After perl has been installed, users may install their own local architecture-independent modules in this directory with MakeMaker Makefile.PL or equivalent. See CWINSTALL for details. From sitelib.U: This variable is CW$sitelibexp with any trailing version-specific component removed. The elements in inc_version_list (inc_version_list.U) can be tacked onto this variable to generate a list of directories to search. From sitelib.U: This variable is the ~name expanded version of sitelib, so that you may use it directly in Makefiles or shell scripts. From siteman1dir.U: This variable contains the name of the directory in which site-specific manual source pages are to be put. It is the responsibility of the Makefile.SH to get the value of this into the proper command. You must be prepared to do the ~name expansion yourself. The standard distribution will put nothing in this directory. After perl has been installed, users may install their own local man1 pages in this directory with MakeMaker Makefile.PL or equivalent. See CWINSTALL for details. From siteman1dir.U: This variable is the same as the siteman1dir variable, but is filename expanded at configuration time, for convenient use in makefiles. From siteman3dir.U: This variable contains the name of the directory in which site-specific library man source pages are to be put. It is the responsibility of the Makefile.SH to get the value of this into the proper command. You must be prepared to do the ~name expansion yourself. The standard distribution will put nothing in this directory. After perl has been installed, users may install their own local man3 pages in this directory with MakeMaker Makefile.PL or equivalent. See CWINSTALL for details. From siteman3dir.U: This variable is the same as the siteman3dir variable, but is filename expanded at configuration time, for convenient use in makefiles. From siteprefix.U: This variable holds the full absolute path of the directory below which the user will install add-on packages. See CWINSTALL for usage and examples. From siteprefix.U: This variable holds the full absolute path of the directory below which the user will install add-on packages. Derived from siteprefix. From sitescript.U: This variable holds the name of the directory in which the user wants to put add-on publicly executable files for the package in question. It is most often a local directory such as /usr/local/bin. Programs using this variable must be prepared to deal with ~name substitution. The standard distribution will put nothing in this directory. After perl has been installed, users may install their own local scripts in this directory with MakeMaker Makefile.PL or equivalent. See CWINSTALL for details. From sitescript.U: This is the same as the sitescript variable, but is filename expanded at configuration time, for use in your makefiles. From sizesize.U: This variable contains the size of a sizetype in bytes. From sizetype.U: This variable defines sizetype to be something like size_t, unsigned long, or whatever type is used to declare length parameters for string functions. From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful. From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful. From so.U: This variable holds the extension used to identify shared libraries (also known as shared objects) on the system. Usually set to CWso. From d_socket.U: This variable has any cpp CW-I flags needed for socket support. From d_socket.U: This variable has the names of any libraries needed for socket support. From socksizetype.U: This variable holds the type used for the size argument for various socket calls like accept. Usual values include socklen_t, size_t, and int. From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the sort program. After Configure runs, the value is reset to a plain CWsort and is not useful. From package.U: This variable contains the name of the package being constructed, with the first letter uppercased, i.e. suitable for starting sentences. From spitshell.U: This variable contains the command necessary to spit out a runnable shell on this system. It is either cat or a grep CW-v for # comments. From quadfio.U: This variable, if defined, contains the string used by stdio to format 64-bit decimal numbers (format CWd) for output. From longdblfio.U: This variable, if defined, contains the string used by stdio to format long doubles (format CWe) for output. From longdblfio.U: This variable, if defined, contains the string used by stdio to format long doubles (format CWE) for output. The CWU in the name is to separate this from sPRIeldbl so that even case-blind systems can see the difference. From longdblfio.U: This variable, if defined, contains the string used by stdio to format long doubles (format CWf) for output. From longdblfio.U: This variable, if defined, contains the string used by stdio to format long doubles (format CWF) for output. The CWU in the name is to separate this from sPRIfldbl so that even case-blind systems can see the difference. From longdblfio.U: This variable, if defined, contains the string used by stdio to format long doubles (format CWg) for output. From longdblfio.U: This variable, if defined, contains the string used by stdio to format long doubles (format CWG) for output. The CWU in the name is to separate this from sPRIgldbl so that even case-blind systems can see the difference. From quadfio.U: This variable, if defined, contains the string used by stdio to format 64-bit decimal numbers (format CWi) for output. From quadfio.U: This variable, if defined, contains the string used by stdio to format 64-bit octal numbers (format CWo) for output. From quadfio.U: This variable, if defined, contains the string used by stdio to format 64-bit unsigned decimal numbers (format CWu) for output. From quadfio.U: This variable, if defined, contains the string used by stdio to format 64-bit hexadecimal numbers (format CWx) for output. From quadfio.U: This variable, if defined, contains the string used by stdio to format 64-bit hExADECimAl numbers (format CWX) for output. The CWU in the name is to separate this from sPRIx64 so that even case-blind systems can see the difference. From d_srand48_r.U: This variable encodes the prototype of srand48_r. It is zero if d_srand48_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_srand48_r is defined. From d_srandom_r.U: This variable encodes the prototype of srandom_r. It is zero if d_srandom_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_srandom_r is defined. From src.U: This variable holds the path to the package source. It is up to the Makefile to use this variable and set CWVPATH accordingly to find the sources remotely. From longdblfio.U: This variable, if defined, contains the string used by stdio to format long doubles (format CWf) for input. From ssizetype.U: This variable defines ssizetype to be something like ssize_t, long or int. It is used by functions that return a count of bytes or an error condition. It must be a signed type. We will pick a type such that sizeof(SSize_t) == sizeof(Size_t). From startperl.U: This variable contains the string to put on the front of a perl script to make sure (hopefully) that it runs with perl and not some shell. Of course, that leading line must be followed by the classical perl idiom: eval 'exec perl -S CW$0 ${1+CW$@}' if CW$running_under_some_shell; to guarantee perl startup should the shell execute the script. Note that this magic incatation is not understood by csh. From startsh.U: This variable contains the string to put on the front of a shell script to make sure (hopefully) that it runs with sh and not some other shell. From Extensions.U: This variable holds a list of CWXS extension files we want to link statically into the package. It is used by Makefile. From stdchar.U: This variable conditionally defines CWSTDCHAR to be the type of char used in stdio.h. It has the values unsigned char or CWchar. From d_stdstdio.U: This variable defines how, given a CWFILE pointer, fp, to access the _base field (or equivalent) of stdio.h's CWFILE structure. This will be used to define the macro FILE_base(fp). From d_stdstdio.U: This variable defines how, given a CWFILE pointer, fp, to determine the number of bytes store in the I/O buffer pointer to by the _base field (or equivalent) of stdio.h's CWFILE structure. This will be used to define the macro FILE_bufsiz(fp). From d_stdstdio.U: This variable defines how, given a CWFILE pointer, fp, to access the _cnt field (or equivalent) of stdio.h's CWFILE structure. This will be used to define the macro FILE_cnt(fp). From d_stdstdio.U: This variable defines how, given a CWFILE pointer, fp, to tell stdio to refill its internal buffers (?). This will be used to define the macro FILE_filbuf(fp). From d_stdstdio.U: This variable defines how, given a CWFILE pointer, fp, to access the _ptr field (or equivalent) of stdio.h's CWFILE structure. This will be used to define the macro FILE_ptr(fp). From stdio_streams.U: This variable tells the name of the array holding the stdio streams. Usual values include _iob, __iob, and __sF. From d_strerror_r.U: This variable encodes the prototype of strerror_r. It is zero if d_strerror_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_strerror_r is defined. From i_string.U: This variable holds the full path of the string header that will be used. Typically /usr/include/string.h or /usr/include/strings.h. From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful. From patchlevel.U: The subversion level of this package. The value of subversion comes from the patchlevel.h file. In a version number such as 5.6.1, this is the CW1. In patchlevel.h, this is referred to as CWPERL_SUBVERSION. This is unique to perl. From sysman.U: This variable holds the place where the manual is located on this system. It is not the place where the user wants to put his manual pages. Rather it is the place where Configure may look to find manual for unix commands (section 1 of the manual usually). See mansrc.

From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful. From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful. From Cross.U: If cross-compiling, this variable contains the target architecture. If not, this will be empty. From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful. From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful. From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the test program. After Configure runs, the value is reset to a plain CWtest and is not useful. From i_time.U: This variable holds the full path of the included time header(s). From d_time.U: This variable holds the type returned by time(). It can be long, or time_t on CWBSD sites (in which case <sys/types.h> should be included). Anyway, the type Time_t should be used. From d_tmpnam_r.U: This variable encodes the prototype of tmpnam_r. It is zero if d_tmpnam_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_tmpnam_r is defined. From Cross.U: This variable contains the command used by Configure to copy to from the target host. Useful and available only during Perl build. The string CW: if not cross-compiling. From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the touch program. After Configure runs, the value is reset to a plain CWtouch and is not useful. From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the tr program. After Configure runs, the value is reset to a plain CWtr and is not useful. From trnl.U: This variable contains the value to be passed to the tr(1) command to transliterate a newline. Typical values are CW\012 and CW\n. This is needed for CWEBCDIC systems where newline is not necessarily CW\012. From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful. From d_ttyname_r.U: This variable encodes the prototype of ttyname_r. It is zero if d_ttyname_r is undef, and one of the CWREENTRANT_PROTO_T_ABC macros of reentr.h if d_ttyname_r is defined.

From perlxv.U: This variable is the size of an U16 in bytes. From perlxv.U: This variable contains the C type used for Perl's U16. From perlxv.U: This variable is the size of an U32 in bytes. From perlxv.U: This variable contains the C type used for Perl's U32. From perlxv.U: This variable is the size of an U64 in bytes. From perlxv.U: This variable contains the C type used for Perl's U64. From perlxv.U: This variable is the size of an U8 in bytes. From perlxv.U: This variable contains the C type used for Perl's U8. From uidf.U: This variable contains the format string used for printing a Uid_t. From uidsign.U: This variable contains the signedness of a uidtype. 1 for unsigned, -1 for signed. From uidsize.U: This variable contains the size of a uidtype in bytes. From uidtype.U: This variable defines Uid_t to be something like uid_t, int, ushort, or whatever type is used to declare user ids in the kernel. From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the uname program. After Configure runs, the value is reset to a plain CWuname and is not useful. From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the uniq program. After Configure runs, the value is reset to a plain CWuniq and is not useful. From quadtype.U: This variable defines Uquad_t to be something like unsigned long, unsigned int, unsigned long long, uint64_t, or whatever type is used for 64-bit integers. From usethreads.U: This variable conditionally defines the USE_5005THREADS symbol, and indicates that Perl should be built to use the 5.005-based threading implementation. From use64bits.U: This variable conditionally defines the USE_64_BIT_ALL symbol, and indicates that 64-bit integer types should be used when available. The maximal possible 64-bitness is employed: LP64 or ILP64, meaning that you will be able to use more than 2 gigabytes of memory. This mode is even more binary incompatible than USE_64_BIT_INT. You may not be able to run the resulting executable in a 32-bit CWCPU at all or you may need at least to reboot your CWOS to 64-bit mode. From use64bits.U: This variable conditionally defines the USE_64_BIT_INT symbol, and indicates that 64-bit integer types should be used when available. The minimal possible 64-bitness is employed, just enough to get 64-bit integers into Perl. This may mean using for example long longs, while your memory may still be limited to 2 gigabytes. From Cross.U: This variable conditionally defines the CWUSE_CROSS_COMPILE symbol, and indicates that Perl has been cross-compiled. From dlsrc.U: This variable indicates if the system supports dynamic loading of some sort. See also dlsrc and dlobj. From usefaststdio.U: This variable conditionally defines the CWUSE_FAST_STDIO symbol, and indicates that Perl should be built to use CWfast stdio. Defaults to define in Perls 5.8 and earlier, to undef later. From usethreads.U: This variable conditionally defines the CWUSE_ITHREADS symbol, and indicates that Perl should be built to use the interpreter-based threading implementation. From uselfs.U: This variable conditionally defines the CWUSE_LARGE_FILES symbol, and indicates that large file interfaces should be used when available. From uselongdbl.U: This variable conditionally defines the CWUSE_LONG_DOUBLE symbol, and indicates that long doubles should be used when available. From mallocsrc.U: This variable contains y if we are wrapping malloc to prevent integer overflow during size calculations. From usemorebits.U: This variable conditionally defines the CWUSE_MORE_BITS symbol, and indicates that explicit 64-bit interfaces and long doubles should be used when available. From usemultiplicity.U: This variable conditionally defines the CWMULTIPLICITY symbol, and indicates that Perl should be built to use multiplicity. From mallocsrc.U: This variable contains y if the malloc that comes with this package is desired over the system's version of malloc. People often include special versions of malloc for effiency, but such versions are often less portable. See also mallocsrc and mallocobj. If this is CWy, then -lmalloc is removed from CW$libs. From usenm.U: This variable contains CWtrue or CWfalse depending whether the nm extraction is wanted or not. From Extensions.U: This variable holds either CWtrue or CWfalse to indicate whether the Opcode extension should be used. The sole use for this currently is to allow an easy mechanism for users to skip the Opcode extension from the Configure command line. From useperlio.U: This variable conditionally defines the CWUSE_PERLIO symbol, and indicates that the PerlIO abstraction should be used throughout. From Extensions.U: This variable holds either CWtrue or CWfalse to indicate whether the CWPOSIX extension should be used. The sole use for this currently is to allow an easy mechanism for hints files to indicate that CWPOSIX will not compile on a particular system. From usethreads.U: This variable conditionally defines the CWUSE_REENTRANT_API symbol, which indicates that the thread code may try to use the various _r versions of library functions. This is only potentially meaningful if usethreads is set and is very experimental, it is not even prompted for. From d_sfio.U: This variable is set to true when the user agrees to use sfio. It is set to false when sfio is not available or when the user explicitely requests not to use sfio. It is here primarily so that command-line settings can override the auto-detection of d_sfio without running into a WHOA THERE. From libperl.U: This variable is set to CWtrue if the user wishes to build a shared libperl, and CWfalse otherwise. From usesocks.U: This variable conditionally defines the CWUSE_SOCKS symbol, and indicates that Perl should be built to use CWSOCKS. From usethreads.U: This variable conditionally defines the CWUSE_THREADS symbol, and indicates that Perl should be built to use threads. From vendorprefix.U: This variable tells whether the vendorprefix and consequently other vendor* paths are in use. From d_vfork.U: This variable is set to true when the user accepts to use vfork. It is set to false when no vfork is available or when the user explicitely requests not to use vfork. From usrinc.U: This variable holds the path of the include files, which is usually /usr/include. It is mainly used by other Configure units. From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful. From perlxvf.U: This variable contains the format string used for printing a Perl CWUV as an unsigned octal integer. From perlxv.U: This variable is the size of a CWUV in bytes. From perlxv.U: This variable contains the C type used for Perl's CWUV. From perlxvf.U: This variable contains the format string used for printing a Perl CWUV as an unsigned decimal integer. From perlxvf.U: This variable contains the format string used for printing a Perl CWUV as an unsigned hexadecimal integer in lowercase abcdef. From perlxvf.U: This variable contains the format string used for printing a Perl CWUV as an unsigned hexadecimal integer in uppercase CWABCDEF.

From vendorarch.U: This variable contains the value of the CWPERL_VENDORARCH symbol. It may have a ~ on the front. The standard distribution will put nothing in this directory. Vendors who distribute perl may wish to place their own architecture-dependent modules and extensions in this directory with MakeMaker Makefile.PL CWINSTALLDIRS=vendor or equivalent. See CWINSTALL for details. From vendorarch.U: This variable is the ~name expanded version of vendorarch, so that you may use it directly in Makefiles or shell scripts. From vendorbin.U: This variable contains the eventual value of the CWVENDORBIN symbol. It may have a ~ on the front. The standard distribution will put nothing in this directory. Vendors who distribute perl may wish to place additional binaries in this directory with MakeMaker Makefile.PL CWINSTALLDIRS=vendor or equivalent. See CWINSTALL for details. From vendorbin.U: This variable is the ~name expanded version of vendorbin, so that you may use it directly in Makefiles or shell scripts. From vendorhtml1dir.U: This variable contains the name of the directory for html pages. It may have a ~ on the front. The standard distribution will put nothing in this directory. Vendors who distribute perl may wish to place their own html pages in this directory with MakeMaker Makefile.PL CWINSTALLDIRS=vendor or equivalent. See CWINSTALL for details. From vendorhtml1dir.U: This variable is the ~name expanded version of vendorhtml1dir, so that you may use it directly in Makefiles or shell scripts. From vendorhtml3dir.U: This variable contains the name of the directory for html library pages. It may have a ~ on the front. The standard distribution will put nothing in this directory. Vendors who distribute perl may wish to place their own html pages for modules and extensions in this directory with MakeMaker Makefile.PL CWINSTALLDIRS=vendor or equivalent. See CWINSTALL for details. From vendorhtml3dir.U: This variable is the ~name expanded version of vendorhtml3dir, so that you may use it directly in Makefiles or shell scripts. From vendorlib.U: This variable contains the eventual value of the CWVENDORLIB symbol, which is the name of the private library for this package. The standard distribution will put nothing in this directory. Vendors who distribute perl may wish to place their own modules in this directory with MakeMaker Makefile.PL CWINSTALLDIRS=vendor or equivalent. See CWINSTALL for details. From vendorlib.U: This variable is CW$vendorlibexp with any trailing version-specific component removed. The elements in inc_version_list (inc_version_list.U) can be tacked onto this variable to generate a list of directories to search. From vendorlib.U: This variable is the ~name expanded version of vendorlib, so that you may use it directly in Makefiles or shell scripts. From vendorman1dir.U: This variable contains the name of the directory for man1 pages. It may have a ~ on the front. The standard distribution will put nothing in this directory. Vendors who distribute perl may wish to place their own man1 pages in this directory with MakeMaker Makefile.PL CWINSTALLDIRS=vendor or equivalent. See CWINSTALL for details. From vendorman1dir.U: This variable is the ~name expanded version of vendorman1dir, so that you may use it directly in Makefiles or shell scripts. From vendorman3dir.U: This variable contains the name of the directory for man3 pages. It may have a ~ on the front. The standard distribution will put nothing in this directory. Vendors who distribute perl may wish to place their own man3 pages in this directory with MakeMaker Makefile.PL CWINSTALLDIRS=vendor or equivalent. See CWINSTALL for details. From vendorman3dir.U: This variable is the ~name expanded version of vendorman3dir, so that you may use it directly in Makefiles or shell scripts. From vendorprefix.U: This variable holds the full absolute path of the directory below which the vendor will install add-on packages. See CWINSTALL for usage and examples. From vendorprefix.U: This variable holds the full absolute path of the directory below which the vendor will install add-on packages. Derived from vendorprefix. From vendorscript.U: This variable contains the eventual value of the CWVENDORSCRIPT symbol. It may have a ~ on the front. The standard distribution will put nothing in this directory. Vendors who distribute perl may wish to place additional executable scripts in this directory with MakeMaker Makefile.PL CWINSTALLDIRS=vendor or equivalent. See CWINSTALL for details. From vendorscript.U: This variable is the ~name expanded version of vendorscript, so that you may use it directly in Makefiles or shell scripts. From patchlevel.U: The full version number of this package, such as 5.6.1 (or 5_6_1). This combines revision, patchlevel, and subversion to get the full version number, including any possible subversions. This is suitable for use as a directory name, and hence is filesystem dependent. From patchlevel.U: This is a string combining version, subversion and perl_patchlevel (if perl_patchlevel is non-zero). It is typically something like 'version 7 subversion 1' or 'version 7 subversion 1 patchlevel 11224' It is computed here to avoid duplication of code in myconfig.SH and lib/Config.pm. From versiononly.U: If set, this symbol indicates that only the version-specific components of a perl installation should be installed. This may be useful for making a test installation of a new version without disturbing the existing installation. Setting versiononly is equivalent to setting installperl's -v option. In particular, the non-versioned scripts and programs such as a2p, c2ph, h2xs, pod2*, and perldoc are not installed (see CWINSTALL for a more complete list). Nor are the man pages installed. Usually, this is undef. From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful. From voidflags.U: This variable contains the eventual value of the CWVOIDFLAGS symbol, which indicates how much support of the void type is given by this compiler. See CWVOIDFLAGS for more info.

From libpth.U: This variable holds extra path (space-separated) used to find libraries on this platform, for example CWCPU-specific libraries (on multi-CWCPU platforms) may be listed here.

From yacc.U: This variable holds the name of the compiler compiler we want to use in the Makefile. It can be yacc, byacc, or bison -y. From yacc.U: This variable contains any additional yacc flags desired by the user. It is up to the Makefile to use this.

From Loc.U: This variable is defined but not used by Configure. The value is a plain '' and is not useful. From Loc.U: This variable is used internally by Configure to determine the full pathname (if any) of the zip program. After Configure runs, the value is reset to a plain CWzip and is not useful.

This module contains a good example of how to use tie to implement a cache and an example of how to make a tied variable readonly to those outside of it.