1 This file contains a description of all the shell variables whose value is
2 determined by the Configure script. Variables intended for use in C
3 programs (e.g. I_UNISTD) are already described in config_h.SH.
6 This variable defines the extension used for ordinary libraries.
7 For unix, it is '.a'. The '.' is included. Other possible
11 This variable defines the extension used for executable files.
12 For unix it is empty. Other possible values include '.exe'.
15 This variable defines the extension used for object files.
16 For unix, it is '.o'. The '.' is included. Other possible
17 values include '.obj'.
20 This variable is set to 'true' if AFS (Andrew File System) is used
21 on the system, 'false' otherwise. It is possible to override this
22 with a hint value or command line option, but you'd better know
25 alignbytes (alignbytes.U):
26 This variable holds the number of bytes required to align a
27 double. Usual values are 2, 4 and 8.
29 aphostname (d_gethname.U):
30 Thie variable contains the command which can be used to compute the
31 host name. The command is fully qualified by its absolute path, to make
32 it safe when used by a process with super-user privileges.
35 This variable holds the name of the directory in which the user wants
36 to put architecture-dependent public library files for $package.
37 It is most often a local directory such as /usr/local/lib.
38 Programs using this variable must be prepared to deal
39 with filename expansion.
41 archlibexp (archlib.U):
42 This variable is the same as the archlib variable, but is
43 filename expanded at configuration time, for convenient use.
45 archname (archname.U):
46 This variable is a short name to characterize the current
47 architecture. It is used mainly to construct the default archlib.
50 This variable defines any additional objects that must be linked
51 in with the program on this architecture. On unix, it is usually
52 empty. It is typically used to include emulations of unix calls
53 or other facilities. For perl on OS/2, for example, this would
57 The base revision level of this package, from the .package file.
60 This variable holds the name of the directory in which the user wants
61 to put publicly executable images for the package in question. It
62 is most often a local directory such as /usr/local/bin. Programs using
63 this variable must be prepared to deal with ~name substitution.
65 bincompat3 (bincompat3.U):
66 This variable contains y if Perl 5.004 should be binary-compatible
70 This is the same as the bin variable, but is filename expanded at
71 configuration time, for use in your makefiles.
73 byteorder (byteorder.U):
74 This variable holds the byte order. In the following, larger digits
75 indicate more significance. The variable byteorder is either 4321
76 on a big-endian machine, or 1234 on a little-endian, or 87654321
77 on a Cray ... or 3412 with weird order !
80 This variable contains the \c string if that is what causes the echo
81 command to suppress newline. Otherwise it is null. Correct usage is
82 $echo $n "prompt for a question: $c".
84 castflags (d_castneg.U):
85 This variable contains a flag that precise difficulties the
86 compiler has casting odd floating values to unsigned long:
89 2 = couldn't cast >= 0x80000000
90 4 = couldn't cast in argument expression list
93 This variable holds the name of a command to execute a C compiler which
94 can resolve multiple global references that happen to have the same
95 name. Usual values are "cc", "Mcc", "cc -M", and "gcc".
98 This variable contains any special flags that might need to be
99 passed with cc -c to compile modules to be used to create a shared
100 library that will be used for dynamic loading. For hpux, this
101 should be +z. It is up to the makefile to use it.
104 This variable contains any special flags that might need to be
105 passed to cc to link with a shared library for dynamic loading.
106 It is up to the makefile to use it. For sunos 4.1, it should
110 This variable contains any additional C compiler flags desired by
111 the user. It is up to the Makefile to use this.
114 Login name of the person who ran the Configure script and answered the
115 questions. This is used to tag both config.sh and config_h.SH.
117 cf_email (cf_email.U):
118 Electronic mail address of the person who ran Configure. This can be
119 used by units that require the user's e-mail, like MailList.U.
122 Holds the output of the "date" command when the configuration file was
123 produced. This is used to tag both config.sh and config_h.SH.
125 clocktype (d_times.U):
126 This variable holds the type returned by times(). It can be long,
127 or clock_t on BSD sites (in which case <sys/types.h> should be
130 contains (contains.U):
131 This variable holds the command to do a grep with a proper return
132 status. On most sane systems it is simply "grep". On insane systems
133 it is a grep followed by a cat followed by a test. This variable
134 is primarily for the use of other Configure units.
136 cpp_stuff (cpp_stuff.U):
137 This variable contains an identification of the catenation mechanism
138 used by the C preprocessor.
140 cppflags (ccflags.U):
141 This variable holds the flags that will be passed to the C pre-
142 processor. It is up to the Makefile to use it.
144 cpplast (cppstdin.U):
145 This variable has the same functionality as cppminus, only it applies to
146 cpprun and not cppstdin.
148 cppminus (cppstdin.U):
149 This variable contains the second part of the string which will invoke
150 the C preprocessor on the standard input and produce to standard
151 output. This variable will have the value "-" if cppstdin needs a minus
152 to specify standard input, otherwise the value is "".
155 This variable contains the command which will invoke a C preprocessor
156 on standard input and put the output to stdout. It is guaranteed not
157 to be a wrapper and may be a null string if no preprocessor can be
158 made directly available. This preprocessor might be different from the
159 one used by the C compiler. Don't forget to append cpplast after the
160 preprocessor options.
162 cppstdin (cppstdin.U):
163 This variable contains the command which will invoke the C
164 preprocessor on standard input and put the output to stdout.
165 It is primarily used by other Configure units that ask about
166 preprocessor symbols.
168 cryptlib (d_crypt.U):
169 This variable holds -lcrypt or the path to a libcrypt.a archive if
170 the crypt() function is not defined in the standard C library. It is
171 up to the Makefile to use this.
173 d_Gconvert (d_gconvert.U):
174 This variable holds what Gconvert is defined as to convert
175 floating point numbers into strings. It could be 'gconvert'
176 or a more complex macro emulating gconvert with gcvt() or sprintf.
178 d_access (d_access.U):
179 This variable conditionally defines HAS_ACCESS if the access() system
180 call is available to check for access permissions using real IDs.
183 This variable conditionally defines the HAS_ALARM symbol, which
184 indicates to the C program that the alarm() routine is available.
186 d_archlib (archlib.U):
187 This variable conditionally defines ARCHLIB to hold the pathname
188 of architecture-dependent library files for $package. If
189 $archlib is the same as $privlib, then this is set to undef.
192 This variable conditionally defines the HAS_BCMP symbol if
193 the bcmp() routine is available to compare strings.
196 This variable conditionally defines the HAS_BCOPY symbol if
197 the bcopy() routine is available to copy strings.
199 d_bincompat3 (bincompat3.U):
200 This variable conditionally defines BINCOMPAT3 so that embed.h
201 can take special action if Perl 5.004 should be binary-compatible
202 with Perl 5.003. This is impossible for 5.004_50 and later, so
203 it is always $undef for those versions.
206 This symbol conditionally defines the symbol BSD when running on a
209 d_bsdgetpgrp (d_getpgrp.U):
210 This variable conditionally defines USE_BSD_GETPGRP if
211 getpgrp needs one arguments whereas USG one needs none.
214 This variable conditionally defines the HAS_BZERO symbol if
215 the bzero() routine is available to set memory to 0.
217 d_casti32 (d_casti32.U):
218 This variable conditionally defines CASTI32, which indicates
219 whether the C compiler can cast large floats to 32-bit ints.
221 d_castneg (d_castneg.U):
222 This variable conditionally defines CASTNEG, which indicates
223 wether the C compiler can cast negative float to unsigned.
225 d_charvspr (d_vprintf.U):
226 This variable conditionally defines CHARVSPRINTF if this system
227 has vsprintf returning type (char*). The trend seems to be to
228 declare it as "int vsprintf()".
231 This variable conditionally defines the HAS_CHOWN symbol, which
232 indicates to the C program that the chown() routine is available.
234 d_chroot (d_chroot.U):
235 This variable conditionally defines the HAS_CHROOT symbol, which
236 indicates to the C program that the chroot() routine is available.
238 d_chsize (d_chsize.U):
239 This variable conditionally defines the CHSIZE symbol, which
240 indicates to the C program that the chsize() routine is available
241 to truncate files. You might need a -lx to get this routine.
243 d_closedir (d_closedir.U):
244 This variable conditionally defines HAS_CLOSEDIR if closedir() is
248 This variable conditionally defines the HASCONST symbol, which
249 indicates to the C program that this C compiler knows about the
253 This variable conditionally defines the CRYPT symbol, which
254 indicates to the C program that the crypt() routine is available
255 to encrypt passwords and the like.
258 This variable conditionally defines the CSH symbol, which
259 indicates to the C program that the C-shell exists.
261 d_cuserid (d_cuserid.U):
262 This variable conditionally defines the HAS_CUSERID symbol, which
263 indicates to the C program that the cuserid() routine is available
264 to get character login names.
266 d_dbl_dig (d_dbl_dig.U):
267 This variable conditionally defines d_dbl_dig if this system's
268 header files provide DBL_DIG, which is the number of significant
269 digits in a double precision number.
271 d_difftime (d_difftime.U):
272 This variable conditionally defines the HAS_DIFFTIME symbol, which
273 indicates to the C program that the difftime() routine is available.
275 d_dirnamlen (i_dirent.U):
276 This variable conditionally defines DIRNAMLEN, which indicates
277 to the C program that the length of directory entry names is
278 provided by a d_namelen field.
280 d_dlerror (d_dlerror.U):
281 This variable conditionally defines the HAS_DLERROR symbol, which
282 indicates to the C program that the dlerror() routine is available.
284 d_dlopen (d_dlopen.U):
285 This variable conditionally defines the HAS_DLOPEN symbol, which
286 indicates to the C program that the dlopen() routine is available.
288 d_dlsymun (d_dlsymun.U):
289 This variable conditionally defines DLSYM_NEEDS_UNDERSCORE, which
290 indicates that we need to prepend an underscore to the symbol
291 name before calling dlsym().
293 d_dosuid (d_dosuid.U):
294 This variable conditionally defines the symbol DOSUID, which
295 tells the C program that it should insert setuid emulation code
296 on hosts which have setuid #! scripts disabled.
299 This variable conditionally defines HAS_DUP2 if dup2() is
300 available to duplicate file descriptors.
302 d_eofnblk (nblock_io.U):
303 This variable conditionally defines EOF_NONBLOCK if EOF can be seen
304 when reading from a non-blocking I/O source.
307 This variable conditionally defines the symbols EUNICE and VAX, which
308 alerts the C program that it must deal with ideosyncracies of VMS.
310 d_fchmod (d_fchmod.U):
311 This variable conditionally defines the HAS_FCHMOD symbol, which
312 indicates to the C program that the fchmod() routine is available
313 to change mode of opened files.
315 d_fchown (d_fchown.U):
316 This variable conditionally defines the HAS_FCHOWN symbol, which
317 indicates to the C program that the fchown() routine is available
318 to change ownership of opened files.
321 This variable conditionally defines the HAS_FCNTL symbol, and indicates
322 whether the fcntl() function exists
324 d_fd_macros (d_fd_set.U):
325 This variable contains the eventual value of the HAS_FD_MACROS symbol,
326 which indicates if your C compiler knows about the macros which
327 manipulate an fd_set.
329 d_fd_set (d_fd_set.U):
330 This variable contains the eventual value of the HAS_FD_SET symbol,
331 which indicates if your C compiler knows about the fd_set typedef.
333 d_fds_bits (d_fd_set.U):
334 This variable contains the eventual value of the HAS_FDS_BITS symbol,
335 which indicates if your fd_set typedef contains the fds_bits member.
336 If you have an fd_set typedef, but the dweebs who installed it did
337 a half-fast job and neglected to provide the macros to manipulate
338 an fd_set, HAS_FDS_BITS will let us know how to fix the gaffe.
340 d_fgetpos (d_fgetpos.U):
341 This variable conditionally defines HAS_FGETPOS if fgetpos() is
342 available to get the file position indicator.
344 d_flexfnam (d_flexfnam.U):
345 This variable conditionally defines the FLEXFILENAMES symbol, which
346 indicates that the system supports filenames longer than 14 characters.
349 This variable conditionally defines HAS_FLOCK if flock() is
350 available to do file locking.
353 This variable conditionally defines the HAS_FORK symbol, which
354 indicates to the C program that the fork() routine is available.
356 d_fpathconf (d_pathconf.U):
357 This variable conditionally defines the HAS_FPATHCONF symbol, which
358 indicates to the C program that the pathconf() routine is available
359 to determine file-system related limits and options associated
360 with a given open file descriptor.
362 d_fsetpos (d_fsetpos.U):
363 This variable conditionally defines HAS_FSETPOS if fsetpos() is
364 available to set the file position indicator.
367 This variable conditionally defines the HAS_FTIME symbol, which indicates
368 that the ftime() routine exists. The ftime() routine is basically
369 a sub-second accuracy clock.
371 d_getgrps (d_getgrps.U):
372 This variable conditionally defines the HAS_GETGROUPS symbol, which
373 indicates to the C program that the getgroups() routine is available
374 to get the list of process groups.
376 d_gethbyaddr (d_gethbyad.U):
377 This variable conditionally defines the HAS_GETHOSTBYADDR symbol, which
378 indicates to the C program that the gethostbyaddr() routine is available
379 to look up hosts by their IP addresses.
381 d_gethent (d_gethent.U):
382 This variable conditionally defines HAS_GETHOSTENT if gethostent() is
383 available to look up host names in some data base or another.
385 d_gethname (d_gethname.U):
386 This variable conditionally defines the HAS_GETHOSTNAME symbol, which
387 indicates to the C program that the gethostname() routine may be
388 used to derive the host name.
390 d_getlogin (d_getlogin.U):
391 This variable conditionally defines the HAS_GETLOGIN symbol, which
392 indicates to the C program that the getlogin() routine is available
393 to get the login name.
395 d_getnbyaddr (d_getnbyad.U):
396 This variable conditionally defines the HAS_GETNETBYADDR symbol, which
397 indicates to the C program that the getnetbyaddr() routine is available
398 to look up networks by their IP addresses.
400 d_getnbyname (d_getnbynm.U):
401 This variable conditionally defines the HAS_GETNETBYNAME symbol, which
402 indicates to the C program that the getnetbyname() routine is available
403 to look up networks by their names.
405 d_getpbyname (d_getprotby.U):
406 This variable conditionally defines the HAS_GETPROTOBYNAME
407 symbol, which indicates to the C program that the
408 getprotobyname() routine is available to look up protocols
411 d_getpbynumber (d_getprotby.U):
412 This variable conditionally defines the HAS_GETPROTOBYNUMBER
413 symbol, which indicates to the C program that the
414 getprotobynumber() routine is available to look up protocols
417 d_getpgid (d_getpgid.U):
418 This variable conditionally defines the HAS_GETPGID symbol, which
419 indicates to the C program that the getpgid(pid) function
420 is available to get the process group id.
422 d_getpgrp2 (d_getpgrp2.U):
423 This variable conditionally defines the HAS_GETPGRP2 symbol, which
424 indicates to the C program that the getpgrp2() (as in DG/UX) routine
425 is available to get the current process group.
427 d_getpgrp (d_getpgrp.U):
428 This variable conditionally defines HAS_GETPGRP if getpgrp() is
429 available to get the current process group.
431 d_getppid (d_getppid.U):
432 This variable conditionally defines the HAS_GETPPID symbol, which
433 indicates to the C program that the getppid() routine is available
434 to get the parent process ID.
436 d_getprior (d_getprior.U):
437 This variable conditionally defines HAS_GETPRIORITY if getpriority()
438 is available to get a process's priority.
440 d_getsbyname (d_getsrvby.U):
441 This variable conditionally defines the HAS_GETSERVBYNAME
442 symbol, which indicates to the C program that the
443 getservbyname() routine is available to look up services
446 d_getsbyport (d_getsrvby.U):
447 This variable conditionally defines the HAS_GETSERVBYPORT
448 symbol, which indicates to the C program that the
449 getservbyport() routine is available to look up services
452 d_gettimeod (d_ftime.U):
453 This variable conditionally defines the HAS_GETTIMEOFDAY symbol, which
454 indicates that the gettimeofday() system call exists (to obtain a
455 sub-second accuracy clock). You should probably include <sys/resource.h>.
457 d_gnulibc (d_gnulibc.U):
458 Defined if we're dealing with the GNU C Library.
461 This variable conditionally defines HAS_HTONL if htonl() and its
462 friends are available to do network order byte swapping.
464 d_index (d_strchr.U):
465 This variable conditionally defines HAS_INDEX if index() and
466 rindex() are available for string searching.
468 d_inetaton (d_inetaton.U):
469 This variable conditionally defines the HAS_INET_ATON symbol, which
470 indicates to the C program that the inet_aton() function is available
471 to parse IP address "dotted-quad" strings.
473 d_isascii (d_isascii.U):
474 This variable conditionally defines the HAS_ISASCII constant,
475 which indicates to the C program that isascii() is available.
477 d_killpg (d_killpg.U):
478 This variable conditionally defines the HAS_KILLPG symbol, which
479 indicates to the C program that the killpg() routine is available
480 to kill process groups.
483 This variable conditionally defines HAS_LINK if link() is
484 available to create hard links.
486 d_locconv (d_locconv.U):
487 This variable conditionally defines HAS_LOCALECONV if localeconv() is
488 available for numeric and monetary formatting conventions.
491 This variable conditionally defines HAS_LOCKF if lockf() is
492 available to do file locking.
495 This variable conditionally defines HAS_LSTAT if lstat() is
496 available to do file stats on symbolic links.
499 This variable conditionally defines the HAS_MBLEN symbol, which
500 indicates to the C program that the mblen() routine is available
501 to find the number of bytes in a multibye character.
503 d_mbstowcs (d_mbstowcs.U):
504 This variable conditionally defines the HAS_MBSTOWCS symbol, which
505 indicates to the C program that the mbstowcs() routine is available
506 to convert a multibyte string into a wide character string.
508 d_mbtowc (d_mbtowc.U):
509 This variable conditionally defines the HAS_MBTOWC symbol, which
510 indicates to the C program that the mbtowc() routine is available
511 to convert multibyte to a wide character.
513 d_memcmp (d_memcmp.U):
514 This variable conditionally defines the HAS_MEMCMP symbol, which
515 indicates to the C program that the memcmp() routine is available
516 to compare blocks of memory.
518 d_memcpy (d_memcpy.U):
519 This variable conditionally defines the HAS_MEMCPY symbol, which
520 indicates to the C program that the memcpy() routine is available
521 to copy blocks of memory.
523 d_memmove (d_memmove.U):
524 This variable conditionally defines the HAS_MEMMOVE symbol, which
525 indicates to the C program that the memmove() routine is available
526 to copy potentatially overlapping blocks of memory.
528 d_memset (d_memset.U):
529 This variable conditionally defines the HAS_MEMSET symbol, which
530 indicates to the C program that the memset() routine is available
531 to set blocks of memory.
534 This variable conditionally defines the HAS_MKDIR symbol, which
535 indicates to the C program that the mkdir() routine is available
536 to create directories..
538 d_mkfifo (d_mkfifo.U):
539 This variable conditionally defines the HAS_MKFIFO symbol, which
540 indicates to the C program that the mkfifo() routine is available.
542 d_mktime (d_mktime.U):
543 This variable conditionally defines the HAS_MKTIME symbol, which
544 indicates to the C program that the mktime() routine is available.
547 This variable conditionally defines the HAS_MSG symbol, which
548 indicates that the entire msg*(2) library is present.
550 d_msgctl (d_msgctl.U):
551 This variable conditionally defines the HAS_MSGCTL symbol, which
552 indicates to the C program that the msgctl() routine is available.
554 d_msgget (d_msgget.U):
555 This variable conditionally defines the HAS_MSGGET symbol, which
556 indicates to the C program that the msgget() routine is available.
558 d_msgrcv (d_msgrcv.U):
559 This variable conditionally defines the HAS_MSGRCV symbol, which
560 indicates to the C program that the msgrcv() routine is available.
562 d_msgsnd (d_msgsnd.U):
563 This variable conditionally defines the HAS_MSGSND symbol, which
564 indicates to the C program that the msgsnd() routine is available.
566 d_mymalloc (mallocsrc.U):
567 This variable conditionally defines MYMALLOC in case other parts
568 of the source want to take special action if MYMALLOC is used.
569 This may include different sorts of profiling or error detection.
572 This variable conditionally defines the HAS_NICE symbol, which
573 indicates to the C program that the nice() routine is available.
575 d_oldpthreads (usethreads.U):
576 This variable conditionally defines the OLD_PTHREADS_API symbol,
577 and indicates that Perl should be built to use the old
578 draft POSIX threads API. This is only potneially meaningful if
581 d_oldsock (d_socket.U):
582 This variable conditionally defines the OLDSOCKET symbol, which
583 indicates that the BSD socket interface is based on 4.1c and not 4.2.
586 This variable conditionally defines the HAS_OPEN3 manifest constant,
587 which indicates to the C program that the 3 argument version of
588 the open(2) function is available.
590 d_pathconf (d_pathconf.U):
591 This variable conditionally defines the HAS_PATHCONF symbol, which
592 indicates to the C program that the pathconf() routine is available
593 to determine file-system related limits and options associated
594 with a given filename.
597 This variable conditionally defines the HAS_PAUSE symbol, which
598 indicates to the C program that the pause() routine is available
599 to suspend a process until a signal is received.
601 d_phostname (d_gethname.U):
602 This variable conditionally defines the PHOSTNAME symbol, which
603 contains the shell command which, when fed to popen(), may be
604 used to derive the host name.
607 This variable conditionally defines the HAS_PIPE symbol, which
608 indicates to the C program that the pipe() routine is available
609 to create an inter-process channel.
612 This variable conditionally defines the HAS_POLL symbol, which
613 indicates to the C program that the poll() routine is available
614 to poll active file descriptors.
616 d_portable (d_portable.U):
617 This variable conditionally defines the PORTABLE symbol, which
618 indicates to the C program that it should not assume that it is
619 running on the machine it was compiled on.
621 d_pthread_yield (d_pthread_y.U):
622 This variable conditionally defines the HAS_PTHREAD_YIELD
623 symbol if the pthread_yield routine is available to yield
624 the execution of the current thread.
626 d_pthreads_created_joinable (d_pthreadj.U):
627 This variable conditionally defines the PTHREADS_CREATED_JOINABLE
628 symbol if pthreads are created in the joinable (aka undetached)
632 This varaible conditionally defines PWAGE, which indicates
633 that struct passwd contains pw_age.
635 d_pwchange (i_pwd.U):
636 This varaible conditionally defines PWCHANGE, which indicates
637 that struct passwd contains pw_change.
640 This varaible conditionally defines PWCLASS, which indicates
641 that struct passwd contains pw_class.
643 d_pwcomment (i_pwd.U):
644 This varaible conditionally defines PWCOMMENT, which indicates
645 that struct passwd contains pw_comment.
647 d_pwexpire (i_pwd.U):
648 This varaible conditionally defines PWEXPIRE, which indicates
649 that struct passwd contains pw_expire.
652 This varaible conditionally defines PWQUOTA, which indicates
653 that struct passwd contains pw_quota.
655 d_readdir (d_readdir.U):
656 This variable conditionally defines HAS_READDIR if readdir() is
657 available to read directory entries.
659 d_readlink (d_readlink.U):
660 This variable conditionally defines the HAS_READLINK symbol, which
661 indicates to the C program that the readlink() routine is available
662 to read the value of a symbolic link.
664 d_rename (d_rename.U):
665 This variable conditionally defines the HAS_RENAME symbol, which
666 indicates to the C program that the rename() routine is available
669 d_rewinddir (d_readdir.U):
670 This variable conditionally defines HAS_REWINDDIR if rewinddir() is
674 This variable conditionally defines HAS_RMDIR if rmdir() is
675 available to remove directories.
677 d_safebcpy (d_safebcpy.U):
678 This variable conditionally defines the HAS_SAFE_BCOPY symbol if
679 the bcopy() routine can do overlapping copies.
681 d_safemcpy (d_safemcpy.U):
682 This variable conditionally defines the HAS_SAFE_MEMCPY symbol if
683 the memcpy() routine can do overlapping copies.
685 d_sanemcmp (d_sanemcmp.U):
686 This variable conditionally defines the HAS_SANE_MEMCMP symbol if
687 the memcpy() routine is available and can be used to compare relative
688 magnitudes of chars with their high bits set.
690 d_sched_yield (d_pthread_y.U):
691 This variable conditionally defines the HAS_SCHED_YIELD
692 symbol if the sched_yield routine is available to yield
693 the execution of the current thread.
695 d_seekdir (d_readdir.U):
696 This variable conditionally defines HAS_SEEKDIR if seekdir() is
699 d_select (d_select.U):
700 This variable conditionally defines HAS_SELECT if select() is
701 available to select active file descriptors. A <sys/time.h>
702 inclusion may be necessary for the timeout field.
705 This variable conditionally defines the HAS_SEM symbol, which
706 indicates that the entire sem*(2) library is present.
708 d_semctl (d_semctl.U):
709 This variable conditionally defines the HAS_SEMCTL symbol, which
710 indicates to the C program that the semctl() routine is available.
712 d_semget (d_semget.U):
713 This variable conditionally defines the HAS_SEMGET symbol, which
714 indicates to the C program that the semget() routine is available.
717 This variable conditionally defines the HAS_SEMOP symbol, which
718 indicates to the C program that the semop() routine is available.
720 d_setegid (d_setegid.U):
721 This variable conditionally defines the HAS_SETEGID symbol, which
722 indicates to the C program that the setegid() routine is available
723 to change the effective gid of the current program.
725 d_seteuid (d_seteuid.U):
726 This variable conditionally defines the HAS_SETEUID symbol, which
727 indicates to the C program that the seteuid() routine is available
728 to change the effective uid of the current program.
730 d_setgrps (d_setgrps.U):
731 This variable conditionally defines the HAS_SETGROUPS symbol, which
732 indicates to the C program that the setgroups() routine is available
733 to set the list of process groups.
735 d_sethent (d_sethent.U):
736 This variable conditionally defines HAS_SETHOSTENT if sethostent() is
739 d_setlinebuf (d_setlnbuf.U):
740 This variable conditionally defines the HAS_SETLINEBUF symbol, which
741 indicates to the C program that the setlinebuf() routine is available
742 to change stderr or stdout from block-buffered or unbuffered to a
745 d_setlocale (d_setlocale.U):
746 This variable conditionally defines HAS_SETLOCALE if setlocale() is
747 available to handle locale-specific ctype implementations.
749 d_setpgid (d_setpgid.U):
750 This variable conditionally defines the HAS_SETPGID symbol if the
751 setpgid(pid, gpid) function is available to set process group ID.
753 d_setpgrp2 (d_setpgrp2.U):
754 This variable conditionally defines the HAS_SETPGRP2 symbol, which
755 indicates to the C program that the setpgrp2() (as in DG/UX) routine
756 is available to set the current process group.
758 d_setpgrp (d_setpgrp.U):
759 This variable conditionally defines HAS_SETPGRP if setpgrp() is
760 available to set the current process group.
762 d_setprior (d_setprior.U):
763 This variable conditionally defines HAS_SETPRIORITY if setpriority()
764 is available to set a process's priority.
766 d_setregid (d_setregid.U):
767 This variable conditionally defines HAS_SETREGID if setregid() is
768 available to change the real and effective gid of the current
771 d_setresgid (d_setregid.U):
772 This variable conditionally defines HAS_SETRESGID if setresgid() is
773 available to change the real, effective and saved gid of the current
776 d_setresuid (d_setreuid.U):
777 This variable conditionally defines HAS_SETREUID if setresuid() is
778 available to change the real, effective and saved uid of the current
781 d_setreuid (d_setreuid.U):
782 This variable conditionally defines HAS_SETREUID if setreuid() is
783 available to change the real and effective uid of the current
786 d_setrgid (d_setrgid.U):
787 This variable conditionally defines the HAS_SETRGID symbol, which
788 indicates to the C program that the setrgid() routine is available
789 to change the real gid of the current program.
791 d_setruid (d_setruid.U):
792 This variable conditionally defines the HAS_SETRUID symbol, which
793 indicates to the C program that the setruid() routine is available
794 to change the real uid of the current program.
796 d_setsid (d_setsid.U):
797 This variable conditionally defines HAS_SETSID if setsid() is
798 available to set the process group ID.
801 This variable conditionally defines the USE_SFIO symbol,
802 and indicates whether sfio is available (and should be used).
805 This variable conditionally defines the HAS_SHM symbol, which
806 indicates that the entire shm*(2) library is present.
809 This variable conditionally defines the HAS_SHMAT symbol, which
810 indicates to the C program that the shmat() routine is available.
812 d_shmatprototype (d_shmat.U):
813 This variable conditionally defines the HAS_SHMAT_PROTOTYPE
814 symbol, which indicates that sys/shm.h has a prototype for
817 d_shmctl (d_shmctl.U):
818 This variable conditionally defines the HAS_SHMCTL symbol, which
819 indicates to the C program that the shmctl() routine is available.
822 This variable conditionally defines the HAS_SHMDT symbol, which
823 indicates to the C program that the shmdt() routine is available.
825 d_shmget (d_shmget.U):
826 This variable conditionally defines the HAS_SHMGET symbol, which
827 indicates to the C program that the shmget() routine is available.
829 d_sigaction (d_sigaction.U):
830 This variable conditionally defines the HAS_SIGACTION symbol, which
831 indicates that the Vr4 sigaction() routine is available.
833 d_sigsetjmp (d_sigsetjmp.U):
834 This variable conditionally defines the HAS_SIGSETJMP symbol,
835 which indicates that the sigsetjmp() routine is available to
836 call setjmp() and optionally save the process's signal mask.
838 d_socket (d_socket.U):
839 This variable conditionally defines HAS_SOCKET, which indicates
840 that the BSD socket interface is supported.
842 d_sockpair (d_socket.U):
843 This variable conditionally defines the HAS_SOCKETPAIR symbol, which
844 indicates that the BSD socketpair() is supported.
846 d_statblks (d_statblks.U):
847 This variable conditionally defines USE_STAT_BLOCKS if this system
848 has a stat structure declaring st_blksize and st_blocks.
850 d_stdio_cnt_lval (d_stdstdio.U):
851 This variable conditionally defines STDIO_CNT_LVALUE if the
852 FILE_cnt macro can be used as an lvalue.
854 d_stdio_ptr_lval (d_stdstdio.U):
855 This variable conditionally defines STDIO_PTR_LVALUE if the
856 FILE_ptr macro can be used as an lvalue.
858 d_stdiobase (d_stdstdio.U):
859 This variable conditionally defines USE_STDIO_BASE if this system
860 has a FILE structure declaring a usable _base field (or equivalent)
863 d_stdstdio (d_stdstdio.U):
864 This variable conditionally defines USE_STDIO_PTR if this system
865 has a FILE structure declaring usable _ptr and _cnt fields (or
866 equivalent) in stdio.h.
868 d_strchr (d_strchr.U):
869 This variable conditionally defines HAS_STRCHR if strchr() and
870 strrchr() are available for string searching.
872 d_strcoll (d_strcoll.U):
873 This variable conditionally defines HAS_STRCOLL if strcoll() is
874 available to compare strings using collating information.
876 d_strctcpy (d_strctcpy.U):
877 This variable conditionally defines the USE_STRUCT_COPY symbol, which
878 indicates to the C program that this C compiler knows how to copy
881 d_strerrm (d_strerror.U):
882 This variable holds what Strerrr is defined as to translate an error
883 code condition into an error message string. It could be 'strerror'
884 or a more complex macro emulating strrror with sys_errlist[], or the
885 "unknown" string when both strerror and sys_errlist are missing.
887 d_strerror (d_strerror.U):
888 This variable conditionally defines HAS_STRERROR if strerror() is
889 available to translate error numbers to strings.
891 d_strtod (d_strtod.U):
892 This variable conditionally defines the HAS_STRTOD symbol, which
893 indicates to the C program that the strtod() routine is available
894 to provide better numeric string conversion than atof().
896 d_strtol (d_strtol.U):
897 This variable conditionally defines the HAS_STRTOL symbol, which
898 indicates to the C program that the strtol() routine is available
899 to provide better numeric string conversion than atoi() and friends.
901 d_strtoul (d_strtoul.U):
902 This variable conditionally defines the HAS_STRTOUL symbol, which
903 indicates to the C program that the strtoul() routine is available
904 to provide conversion of strings to unsigned long.
906 d_strxfrm (d_strxfrm.U):
907 This variable conditionally defines HAS_STRXFRM if strxfrm() is
908 available to transform strings.
910 d_suidsafe (d_dosuid.U):
911 This variable conditionally defines SETUID_SCRIPTS_ARE_SECURE_NOW
912 if setuid scripts can be secure. This test looks in /dev/fd/.
914 d_symlink (d_symlink.U):
915 This variable conditionally defines the HAS_SYMLINK symbol, which
916 indicates to the C program that the symlink() routine is available
917 to create symbolic links.
919 d_syscall (d_syscall.U):
920 This variable conditionally defines HAS_SYSCALL if syscall() is
921 available call arbitrary system calls.
923 d_sysconf (d_sysconf.U):
924 This variable conditionally defines the HAS_SYSCONF symbol, which
925 indicates to the C program that the sysconf() routine is available
926 to determine system related limits and options.
928 d_sysernlst (d_strerror.U):
929 This variable conditionally defines HAS_SYS_ERRNOLIST if sys_errnolist[]
930 is available to translate error numbers to the symbolic name.
932 d_syserrlst (d_strerror.U):
933 This variable conditionally defines HAS_SYS_ERRLIST if sys_errlist[] is
934 available to translate error numbers to strings.
936 d_system (d_system.U):
937 This variable conditionally defines HAS_SYSTEM if system() is
938 available to issue a shell command.
940 d_tcgetpgrp (d_tcgtpgrp.U):
941 This variable conditionally defines the HAS_TCGETPGRP symbol, which
942 indicates to the C program that the tcgetpgrp() routine is available.
943 to get foreground process group ID.
945 d_tcsetpgrp (d_tcstpgrp.U):
946 This variable conditionally defines the HAS_TCSETPGRP symbol, which
947 indicates to the C program that the tcsetpgrp() routine is available
948 to set foreground process group ID.
950 d_telldir (d_readdir.U):
951 This variable conditionally defines HAS_TELLDIR if telldir() is
955 This variable conditionally defines the HAS_TIME symbol, which indicates
956 that the time() routine exists. The time() routine is normaly
957 provided on UNIX systems.
960 This variable conditionally defines the HAS_TIMES symbol, which indicates
961 that the times() routine exists. The times() routine is normaly
962 provided on UNIX systems. You may have to include <sys/times.h>.
964 d_truncate (d_truncate.U):
965 This variable conditionally defines HAS_TRUNCATE if truncate() is
966 available to truncate files.
968 d_tzname (d_tzname.U):
969 This variable conditionally defines HAS_TZNAME if tzname[] is
970 available to access timezone names.
973 This variable conditionally defines the HAS_UMASK symbol, which
974 indicates to the C program that the umask() routine is available.
975 to set and get the value of the file creation mask.
977 d_uname (d_gethname.U):
978 This variable conditionally defines the HAS_UNAME symbol, which
979 indicates to the C program that the uname() routine may be
980 used to derive the host name.
983 This variable conditionally defines the HAS_VFORK symbol, which
984 indicates the vfork() routine is available.
986 d_void_closedir (d_closedir.U):
987 This variable conditionally defines VOID_CLOSEDIR if closedir()
988 does not return a value.
990 d_voidsig (d_voidsig.U):
991 This variable conditionally defines VOIDSIG if this system
992 declares "void (*signal(...))()" in signal.h. The old way was to
993 declare it as "int (*signal(...))()".
995 d_voidtty (i_sysioctl.U):
996 This variable conditionally defines USE_IOCNOTTY to indicate that the
997 ioctl() call with TIOCNOTTY should be used to void tty association.
998 Otherwise (on USG probably), it is enough to close the standard file
999 decriptors and do a setpgrp().
1001 d_volatile (d_volatile.U):
1002 This variable conditionally defines the HASVOLATILE symbol, which
1003 indicates to the C program that this C compiler knows about the
1004 volatile declaration.
1006 d_vprintf (d_vprintf.U):
1007 This variable conditionally defines the HAS_VPRINTF symbol, which
1008 indicates to the C program that the vprintf() routine is available
1009 to printf with a pointer to an argument list.
1011 d_wait4 (d_wait4.U):
1012 This variable conditionally defines the HAS_WAIT4 symbol, which
1013 indicates the wait4() routine is available.
1015 d_waitpid (d_waitpid.U):
1016 This variable conditionally defines HAS_WAITPID if waitpid() is
1017 available to wait for child process.
1019 d_wcstombs (d_wcstombs.U):
1020 This variable conditionally defines the HAS_WCSTOMBS symbol, which
1021 indicates to the C program that the wcstombs() routine is available
1022 to convert wide character strings to multibyte strings.
1024 d_wctomb (d_wctomb.U):
1025 This variable conditionally defines the HAS_WCTOMB symbol, which
1026 indicates to the C program that the wctomb() routine is available
1027 to convert a wide character to a multibyte.
1030 This variable conditionally defines the symbol XENIX, which alerts
1031 the C program that it runs under Xenix.
1033 db_hashtype (i_db.U):
1034 This variable contains the type of the hash structure element
1035 in the <db.h> header file. In older versions of DB, it was
1036 int, while in newer ones it is u_int32_t.
1038 db_prefixtype (i_db.U):
1039 This variable contains the type of the prefix structure element
1040 in the <db.h> header file. In older versions of DB, it was
1041 int, while in newer ones it is size_t.
1043 direntrytype (i_dirent.U):
1044 This symbol is set to 'struct direct' or 'struct dirent' depending on
1045 whether dirent is available or not. You should use this pseudo type to
1046 portably declare your directory entries.
1049 This variable contains the extension that is to be used for the
1050 dynamically loaded modules that perl generaties.
1053 This variable contains the name of the dynamic loading file that
1054 will be used with the package.
1056 doublesize (doublesize.U):
1057 This variable contains the value of the DOUBLESIZE symbol, which
1058 indicates to the C program how many bytes there are in a double.
1060 dynamic_ext (Extensions.U):
1061 This variable holds a list of extension files we want to
1062 link dynamically into the package. It is used by Makefile.
1064 eagain (nblock_io.U):
1065 This variable bears the symbolic errno code set by read() when no
1066 data is present on the file and non-blocking I/O was enabled (otherwise,
1067 read() blocks naturally).
1070 When running under Eunice this variable contains a command which will
1071 convert a shell script to the proper form of text file for it to be
1072 executable by the shell. On other systems it is a no-op.
1075 This is an old synonym for _exe.
1077 extensions (Extensions.U):
1078 This variable holds a list of all extension files
1079 linked into the package. It is propagated to Config.pm
1080 and is typically used to test whether a particular extesion
1083 firstmakefile (Unix.U):
1084 This variable defines the first file searched by make. On unix,
1085 it is makefile (then Makefile). On case-insensitive systems,
1086 it might be something else. This is only used to deal with
1087 convoluted make depend tricks.
1089 fpostype (fpostype.U):
1090 This variable defines Fpos_t to be something like fpost_t, long,
1091 uint, or whatever type is used to declare file positions in libc.
1093 freetype (mallocsrc.U):
1094 This variable contains the return type of free(). It is usually
1095 void, but occasionally int.
1098 This variable contains the full pathname to 'csh', whether or
1099 not the user has specified 'portability'. This is only used
1100 in the compiled C program, and we assume that all systems which
1101 can share this executable will have the same full pathname to
1104 full_sed (Loc_sed.U):
1105 This variable contains the full pathname to 'sed', whether or
1106 not the user has specified 'portability'. This is only used
1107 in the compiled C program, and we assume that all systems which
1108 can share this executable will have the same full pathname to
1112 If GNU cc (gcc) is used, this variable holds '1' or '2' to
1113 indicate whether the compiler is version 1 or 2. This is used in
1114 setting some of the default cflags. It is set to '' if not gcc.
1116 gidtype (gidtype.U):
1117 This variable defines Gid_t to be something like gid_t, int,
1118 ushort, or whatever type is used to declare the return type
1119 of getgid(). Typically, it is the type of group ids in the kernel.
1122 This variable contains a command that produces the text of the
1123 /etc/group file. This is normally "cat /etc/group", but can be
1124 "ypcat group" when NIS is used.
1126 groupstype (groupstype.U):
1127 This variable defines Groups_t to be something like gid_t, int,
1128 ushort, or whatever type is used for the second argument to
1129 getgroups() and setgroups(). Usually, this is the same as
1130 gidtype (gid_t), but sometimes it isn't.
1132 h_fcntl (h_fcntl.U):
1133 This is variable gets set in various places to tell i_fcntl that
1134 <fcntl.h> should be included.
1136 h_sysfile (h_sysfile.U):
1137 This is variable gets set in various places to tell i_sys_file that
1138 <sys/file.h> should be included.
1141 Gives the type of hints used for previous answers. May be one of
1142 "default", "recommended" or "previous".
1145 This variable contains a command that produces the text of the
1146 /etc/hosts file. This is normally "cat /etc/hosts", but can be
1147 "ypcat hosts" when NIS is used.
1150 This variable contains a flag which will tell the C compiler and loader
1151 to produce a program running with a huge memory model. If the
1152 huge model is not supported, contains the flag to produce large
1153 model programs. It is up to the Makefile to use this.
1155 i_bsdioctl (i_sysioctl.U):
1156 This variable conditionally defines the I_SYS_BSDIOCTL symbol, which
1157 indicates to the C program that <sys/bsdioctl.h> exists and should
1161 This variable conditionally defines the I_DB symbol, and indicates
1162 whether a C program may include Berkeley's DB include file <db.h>.
1164 i_dirent (i_dirent.U):
1165 This variable conditionally defines I_DIRENT, which indicates
1166 to the C program that it should include <dirent.h>.
1169 This variable conditionally defines the I_DLD symbol, which
1170 indicates to the C program that <dld.h> (GNU dynamic loading)
1171 exists and should be included.
1173 i_dlfcn (i_dlfcn.U):
1174 This variable conditionally defines the I_DLFCN symbol, which
1175 indicates to the C program that <dlfcn.h> exists and should
1178 i_fcntl (i_fcntl.U):
1179 This variable controls the value of I_FCNTL (which tells
1180 the C program to include <fcntl.h>).
1182 i_float (i_float.U):
1183 This variable conditionally defines the I_FLOAT symbol, and indicates
1184 whether a C program may include <float.h> to get symbols like DBL_MAX
1185 or DBL_MIN, i.e. machine dependent floating point values.
1188 This variable conditionally defines the I_GRP symbol, and indicates
1189 whether a C program should include <grp.h>.
1191 i_limits (i_limits.U):
1192 This variable conditionally defines the I_LIMITS symbol, and indicates
1193 whether a C program may include <limits.h> to get symbols like WORD_BIT
1196 i_locale (i_locale.U):
1197 This variable conditionally defines the I_LOCALE symbol,
1198 and indicates whether a C program should include <locale.h>.
1200 i_malloc (i_malloc.U):
1201 This variable conditionally defines the I_MALLOC symbol, and indicates
1202 whether a C program should include <malloc.h>.
1205 This variable conditionally defines the I_MATH symbol, and indicates
1206 whether a C program may include <math.h>.
1208 i_memory (i_memory.U):
1209 This variable conditionally defines the I_MEMORY symbol, and indicates
1210 whether a C program should include <memory.h>.
1212 i_netdb (i_netdb.U):
1213 This variable conditionally defines the I_NETDB symbol, and indicates
1214 whether a C program should include <netdb.h>.
1216 i_neterrno (i_neterrno.U):
1217 This variable conditionally defines the I_NET_ERRNO symbol, which
1218 indicates to the C program that <net/errno.h> exists and should
1222 This variable conditionally defines I_NETINET_IN, which indicates
1223 to the C program that it should include <netinet/in.h>. Otherwise,
1224 you may try <sys/in.h>.
1227 This variable conditionally defines I_PWD, which indicates
1228 to the C program that it should include <pwd.h>.
1230 i_rpcsvcdbm (i_dbm.U):
1231 This variable conditionally defines the I_RPCSVC_DBM symbol, which
1232 indicates to the C program that <rpcsvc/dbm.h> exists and should
1233 be included. Some System V systems might need this instead of <dbm.h>.
1236 This variable conditionally defines the I_SFIO symbol,
1237 and indicates whether a C program should include <sfio.h>.
1239 i_sgtty (i_termio.U):
1240 This variable conditionally defines the I_SGTTY symbol, which
1241 indicates to the C program that it should include <sgtty.h> rather
1244 i_stdarg (i_varhdr.U):
1245 This variable conditionally defines the I_STDARG symbol, which
1246 indicates to the C program that <stdarg.h> exists and should
1249 i_stddef (i_stddef.U):
1250 This variable conditionally defines the I_STDDEF symbol, which
1251 indicates to the C program that <stddef.h> exists and should
1254 i_stdlib (i_stdlib.U):
1255 This variable conditionally defines the I_STDLIB symbol, which
1256 indicates to the C program that <stdlib.h> exists and should
1259 i_string (i_string.U):
1260 This variable conditionally defines the I_STRING symbol, which
1261 indicates that <string.h> should be included rather than <strings.h>.
1263 i_sysdir (i_sysdir.U):
1264 This variable conditionally defines the I_SYS_DIR symbol, and indicates
1265 whether a C program should include <sys/dir.h>.
1267 i_sysfile (i_sysfile.U):
1268 This variable conditionally defines the I_SYS_FILE symbol, and indicates
1269 whether a C program should include <sys/file.h> to get R_OK and friends.
1271 i_sysfilio (i_sysioctl.U):
1272 This variable conditionally defines the I_SYS_FILIO symbol, which
1273 indicates to the C program that <sys/filio.h> exists and should
1274 be included in preference to <sys/ioctl.h>.
1277 This variable conditionally defines I_SYS_IN, which indicates
1278 to the C program that it should include <sys/in.h> instead of
1281 i_sysioctl (i_sysioctl.U):
1282 This variable conditionally defines the I_SYS_IOCTL symbol, which
1283 indicates to the C program that <sys/ioctl.h> exists and should
1286 i_sysndir (i_sysndir.U):
1287 This variable conditionally defines the I_SYS_NDIR symbol, and indicates
1288 whether a C program should include <sys/ndir.h>.
1290 i_sysparam (i_sysparam.U):
1291 This variable conditionally defines the I_SYS_PARAM symbol, and indicates
1292 whether a C program should include <sys/param.h>.
1294 i_sysresrc (i_sysresrc.U):
1295 This variable conditionally defines the I_SYS_RESOURCE symbol,
1296 and indicates whether a C program should include <sys/resource.h>.
1298 i_sysselct (i_sysselct.U):
1299 This variable conditionally defines I_SYS_SELECT, which indicates
1300 to the C program that it should include <sys/select.h> in order to
1301 get the definition of struct timeval.
1303 i_syssockio (i_sysioctl.U):
1304 This variable conditionally defines I_SYS_SOCKIO to indicate to the
1305 C program that socket ioctl codes may be found in <sys/sockio.h>
1306 instead of <sys/ioctl.h>.
1308 i_sysstat (i_sysstat.U):
1309 This variable conditionally defines the I_SYS_STAT symbol,
1310 and indicates whether a C program should include <sys/stat.h>.
1312 i_systime (i_time.U):
1313 This variable conditionally defines I_SYS_TIME, which indicates
1314 to the C program that it should include <sys/time.h>.
1316 i_systimek (i_time.U):
1317 This variable conditionally defines I_SYS_TIME_KERNEL, which
1318 indicates to the C program that it should include <sys/time.h>
1319 with KERNEL defined.
1321 i_systimes (i_systimes.U):
1322 This variable conditionally defines the I_SYS_TIMES symbol, and indicates
1323 whether a C program should include <sys/times.h>.
1325 i_systypes (i_systypes.U):
1326 This variable conditionally defines the I_SYS_TYPES symbol,
1327 and indicates whether a C program should include <sys/types.h>.
1329 i_sysun (i_sysun.U):
1330 This variable conditionally defines I_SYS_UN, which indicates
1331 to the C program that it should include <sys/un.h> to get UNIX
1332 domain socket definitions.
1334 i_syswait (i_syswait.U):
1335 This variable conditionally defines I_SYS_WAIT, which indicates
1336 to the C program that it should include <sys/wait.h>.
1338 i_termio (i_termio.U):
1339 This variable conditionally defines the I_TERMIO symbol, which
1340 indicates to the C program that it should include <termio.h> rather
1343 i_termios (i_termio.U):
1344 This variable conditionally defines the I_TERMIOS symbol, which
1345 indicates to the C program that the POSIX <termios.h> file is
1349 This variable conditionally defines I_TIME, which indicates
1350 to the C program that it should include <time.h>.
1352 i_unistd (i_unistd.U):
1353 This variable conditionally defines the I_UNISTD symbol, and indicates
1354 whether a C program should include <unistd.h>.
1356 i_utime (i_utime.U):
1357 This variable conditionally defines the I_UTIME symbol, and indicates
1358 whether a C program should include <utime.h>.
1360 i_values (i_values.U):
1361 This variable conditionally defines the I_VALUES symbol, and indicates
1362 whether a C program may include <values.h> to get symbols like MAXLONG
1365 i_varargs (i_varhdr.U):
1366 This variable conditionally defines I_VARARGS, which indicates
1367 to the C program that it should include <varargs.h>.
1369 i_varhdr (i_varhdr.U):
1370 Contains the name of the header to be included to get va_dcl definition.
1371 Typically one of varargs.h or stdarg.h.
1373 i_vfork (i_vfork.U):
1374 This variable conditionally defines the I_VFORK symbol, and indicates
1375 whether a C program should include vfork.h.
1378 This variable must preceed the normal include path to get hte
1379 right one, as in "$incpath/usr/include" or "$incpath/usr/lib".
1380 Value can be "" or "/bsd43" on mips.
1382 installarchlib (archlib.U):
1383 This variable is really the same as archlibexp but may differ on
1384 those systems using AFS. For extra portability, only this variable
1385 should be used in makefiles.
1388 This variable is the same as binexp unless AFS is running in which case
1389 the user is explicitely prompted for it. This variable should always
1390 be used in your makefiles for maximum portability.
1392 installman1dir (man1dir.U):
1393 This variable is really the same as man1direxp, unless you are using
1394 AFS in which case it points to the read/write location whereas
1395 man1direxp only points to the read-only access location. For extra
1396 portability, you should only use this variable within your makefiles.
1398 installman3dir (man3dir.U):
1399 This variable is really the same as man3direxp, unless you are using
1400 AFS in which case it points to the read/write location whereas
1401 man3direxp only points to the read-only access location. For extra
1402 portability, you should only use this variable within your makefiles.
1404 installprivlib (privlib.U):
1405 This variable is really the same as privlibexp but may differ on
1406 those systems using AFS. For extra portability, only this variable
1407 should be used in makefiles.
1409 installscript (scriptdir.U):
1410 This variable is usually the same as scriptdirexp, unless you are on
1411 a system running AFS, in which case they may differ slightly. You
1412 should always use this variable within your makefiles for portability.
1414 installsitearch (sitearch.U):
1415 This variable is really the same as sitearchexp but may differ on
1416 those systems using AFS. For extra portability, only this variable
1417 should be used in makefiles.
1419 installsitelib (sitelib.U):
1420 This variable is really the same as sitelibexp but may differ on
1421 those systems using AFS. For extra portability, only this variable
1422 should be used in makefiles.
1424 intsize (intsize.U):
1425 This variable contains the value of the INTSIZE symbol, which
1426 indicates to the C program how many bytes there are in an int.
1428 known_extensions (Extensions.U):
1429 This variable holds a list of all extensions included in
1433 This variable contains a flag which will tell the C compiler and loader
1434 to produce a program running with a large memory model. It is up to
1435 the Makefile to use this.
1438 This variable indicates the program to be used to link
1439 libraries for dynamic loading. On some systems, it is 'ld'.
1440 On ELF systems, it should be $cc. Mostly, we'll try to respect
1441 the hint file setting.
1443 lddlflags (dlsrc.U):
1444 This variable contains any special flags that might need to be
1445 passed to $ld to create a shared library suitable for dynamic
1446 loading. It is up to the makefile to use it. For hpux, it
1447 should be -b. For sunos 4.1, it is empty.
1449 ldflags (ccflags.U):
1450 This variable contains any additional C loader flags desired by
1451 the user. It is up to the Makefile to use this.
1454 This is an old synonym for _a.
1457 This variable contains the location of the C library.
1459 libperl (libperl.U):
1460 The perl executable is obtained by linking perlmain.c with
1461 libperl, any static extensions (usually just DynaLoader),
1462 and any other libraries needed on this system. libperl
1463 is usually libperl.a, but can also be libperl.so.xxx if
1464 the user wishes to build a perl executable with a shared
1468 This variable holds the general path used to find libraries. It is
1469 intended to be used by other units.
1472 This variable holds the additional libraries we want to use.
1473 It is up to the Makefile to deal with it.
1475 libswanted (Myinit.U):
1476 This variable holds a list of all the libraries we want to
1477 search. The order is chosen to pick up the c library
1478 ahead of ucb or bsd libraries for SVR4.
1480 lkflags (ccflags.U):
1481 This variable contains any additional C partial linker flags desired by
1482 the user. It is up to the Makefile to use this.
1485 This variable holds the name of the command to make
1486 symbolic links (if they are supported). It can be used
1487 in the Makefile. It is either 'ln -s' or 'ln'
1489 locincpth (ccflags.U):
1490 This variable contains a list of additional directories to be
1491 searched by the compiler. The appropriate -I directives will
1492 be added to ccflags. This is intended to simplify setting
1493 local directories from the Configure command line.
1494 It's not much, but it parallels the loclibpth stuff in libpth.U.
1496 loclibpth (libpth.U):
1497 This variable holds the paths used to find local libraries. It is
1498 prepended to libpth, and is intended to be easily set from the
1501 longsize (intsize.U):
1502 This variable contains the value of the LONGSIZE symbol, which
1503 indicates to the C program how many bytes there are in a long.
1505 lseektype (lseektype.U):
1506 This variable defines lseektype to be something like off_t, long,
1507 or whatever type is used to declare lseek offset's type in the
1508 kernel (which also appears to be lseek's return type).
1510 make_set_make (make.U):
1511 Some versions of 'make' set the variable MAKE. Others do not.
1512 This variable contains the string to be included in Makefile.SH
1513 so that MAKE is set if needed, and not if not needed.
1514 Possible values are:
1515 make_set_make='#' # If your make program handles this for you,
1516 make_set_make="MAKE=$make" # if it doesn't.
1517 I used a comment character so that we can distinguish a
1518 'set' value (from a previous config.sh or Configure -D option)
1519 from an uncomputed value.
1521 mallocobj (mallocsrc.U):
1522 This variable contains the name of the malloc.o that this package
1523 generates, if that malloc.o is preferred over the system malloc.
1524 Otherwise the value is null. This variable is intended for generating
1525 Makefiles. See mallocsrc.
1527 mallocsrc (mallocsrc.U):
1528 This variable contains the name of the malloc.c that comes with
1529 the package, if that malloc.c is preferred over the system malloc.
1530 Otherwise the value is null. This variable is intended for generating
1533 malloctype (mallocsrc.U):
1534 This variable contains the kind of ptr returned by malloc and realloc.
1536 man1dir (man1dir.U):
1537 This variable contains the name of the directory in which manual
1538 source pages are to be put. It is the responsibility of the
1539 Makefile.SH to get the value of this into the proper command.
1540 You must be prepared to do the ~name expansion yourself.
1542 man1direxp (man1dir.U):
1543 This variable is the same as the man1dir variable, but is filename
1544 expanded at configuration time, for convenient use in makefiles.
1546 man1ext (man1dir.U):
1547 This variable contains the extension that the manual page should
1548 have: one of 'n', 'l', or '1'. The Makefile must supply the '.'.
1551 man3dir (man3dir.U):
1552 This variable contains the name of the directory in which manual
1553 source pages are to be put. It is the responsibility of the
1554 Makefile.SH to get the value of this into the proper command.
1555 You must be prepared to do the ~name expansion yourself.
1557 man3direxp (man3dir.U):
1558 This variable is the same as the man3dir variable, but is filename
1559 expanded at configuration time, for convenient use in makefiles.
1561 man3ext (man3dir.U):
1562 This variable contains the extension that the manual page should
1563 have: one of 'n', 'l', or '3'. The Makefile must supply the '.'.
1567 This variable contains a flag which will tell the C compiler and loader
1568 to produce a program running with a medium memory model. If the
1569 medium model is not supported, contains the flag to produce large
1570 model programs. It is up to the Makefile to use this.
1572 mips_type (usrinc.U):
1573 This variable holds the environment type for the mips system.
1574 Possible values are "BSD 4.3" and "System V".
1577 This variable contains the list of memory models supported by this
1578 system. Possible component values are none, split, unsplit, small,
1579 medium, large, and huge. The component values are space separated.
1581 modetype (modetype.U):
1582 This variable defines modetype to be something like mode_t,
1583 int, unsigned short, or whatever type is used to declare file
1584 modes for system calls.
1586 myarchname (archname.U):
1587 This variable holds the architecture name computed by Configure in
1588 a previous run. It is not intended to be perused by any user and
1589 should never be set in a hint file.
1591 mydomain (myhostname.U):
1592 This variable contains the eventual value of the MYDOMAIN symbol,
1593 which is the domain of the host the program is going to run on.
1594 The domain must be appended to myhostname to form a complete host name.
1595 The dot comes with mydomain, and need not be supplied by the program.
1597 myuname (Oldconfig.U):
1598 The output of 'uname -a' if available, otherwise the hostname. On Xenix,
1599 pseudo variables assignments in the output are stripped, thank you. The
1600 whole thing is then lower-cased.
1603 This variable contains the -n flag if that is what causes the echo
1604 command to suppress newline. Otherwise it is null. Correct usage is
1605 $echo $n "prompt for a question: $c".
1607 netdb_hlen_type (netdbtype.U):
1608 This variable holds the type used for the 2nd argument to
1609 gethostbyaddr(). Usually, this is int or size_t or unsigned.
1610 This is only useful if you have gethostbyaddr(), naturally.
1612 netdb_host_type (netdbtype.U):
1613 This variable holds the type used for the 1st argument to
1614 gethostbyaddr(). Usually, this is char * or void *, possibly
1615 with or without a const prefix.
1616 This is only useful if you have gethostbyaddr(), naturally.
1618 netdb_name_type (netdbtype.U):
1619 This variable holds the type used for the argument to
1620 gethostbyname(). Usually, this is char * or const char *.
1621 This is only useful if you have gethostbyname(), naturally.
1623 netdb_net_type (netdbtype.U):
1624 This variable holds the type used for the 1st argument to
1625 getnetbyaddr(). Usually, this is int or long.
1626 This is only useful if you have getnetbyaddr(), naturally.
1629 This variable holds the options that may be necessary for nm.
1631 nm_so_opt (usenm.U):
1632 This variable holds the options that may be necessary for nm
1633 to work on a shared library but that can not be used on an
1634 archive library. Currently, this is only used by Linux, where
1635 nm --dynamic is *required* to get symbols from an ELF library which
1636 has been stripped, but nm --dynamic is *fatal* on an archive library.
1637 Maybe Linux should just always set usenm=false.
1639 o_nonblock (nblock_io.U):
1640 This variable bears the symbol value to be used during open() or fcntl()
1641 to turn on non-blocking I/O for a file descriptor. If you wish to switch
1642 between blocking and non-blocking, you may try ioctl(FIOSNBIO) instead,
1643 but that is only supported by some devices.
1646 This is an old synonym for _o.
1648 optimize (ccflags.U):
1649 This variable contains any optimizer/debugger flag that should be used.
1650 It is up to the Makefile to use it.
1652 orderlib (orderlib.U):
1653 This variable is "true" if the components of libraries must be ordered
1654 (with `lorder $* | tsort`) before placing them in an archive. Set to
1655 "false" if ranlib or ar can generate random libraries.
1657 osname (Oldconfig.U):
1658 This variable contains the operating system name (e.g. sunos,
1659 solaris, hpux, etc.). It can be useful later on for setting
1660 defaults. Any spaces are replaced with underscores. It is set
1661 to a null string if we can't figure it out.
1663 osvers (Oldconfig.U):
1664 This variable contains the operating system version (e.g.
1665 4.1.3, 5.2, etc.). It is primarily used for helping select
1666 an appropriate hints file, but might be useful elsewhere for
1667 setting defaults. It is set to '' if we can't figure it out.
1668 We try to be flexible about how much of the version number
1669 to keep, e.g. if 4.1.1, 4.1.2, and 4.1.3 are essentially the
1670 same for this package, hints files might just be os_4.0 or
1671 os_4.1, etc., not keeping separate files for each little release.
1673 package (package.U):
1674 This variable contains the name of the package being constructed.
1675 It is primarily intended for the use of later Configure units.
1678 This variable contains the name of the preferred pager on the system.
1679 Usual values are (the full pathnames of) more, less, pg, or cat.
1682 This variable contains a command that produces the text of the
1683 /etc/passwd file. This is normally "cat /etc/passwd", but can be
1684 "ypcat passwd" when NIS is used.
1686 patchlevel (patchlevel.U):
1687 The patchlevel level of this package.
1688 The value of patchlevel comes from the patchlevel.h file.
1691 This is an old synonym for p_ in Head.U, the character
1692 used to separate elements in the command shell search PATH.
1694 perladmin (perladmin.U):
1695 Electronic mail address of the perl5 administrator.
1697 perlpath (perlpath.U):
1698 This variable contains the eventual value of the PERLPATH symbol,
1699 which contains the name of the perl interpreter to be used in
1700 shell scripts and in the "eval 'exec'" idiom.
1702 phostname (myhostname.U):
1703 This variable contains the eventual value of the PHOSTNAME symbol,
1704 which is a command that can be fed to popen() to get the host name.
1705 The program should probably not presume that the domain is or isn't
1708 pidtype (pidtype.U):
1709 This variable defines PIDTYPE to be something like pid_t, int,
1710 ushort, or whatever type is used to declare process ids in the kernel.
1713 Holds the private path used by Configure to find out the libraries.
1714 Its value is prepend to libpth. This variable takes care of special
1715 machines, like the mips. Usually, it should be empty.
1718 This variable holds the name of the directory below which the
1719 user will install the package. Usually, this is /usr/local, and
1720 executables go in /usr/local/bin, library stuff in /usr/local/lib,
1721 man pages in /usr/local/man, etc. It is only used to set defaults
1722 for things in bin.U, mansrc.U, privlib.U, or scriptdir.U.
1724 prefixexp (prefix.U):
1725 This variable holds the full absolute path of the directory below
1726 which the user will install the package. Derived from prefix.
1728 privlib (privlib.U):
1729 This variable contains the eventual value of the PRIVLIB symbol,
1730 which is the name of the private library for this package. It may
1731 have a ~ on the front. It is up to the makefile to eventually create
1732 this directory while performing installation (with ~ substitution).
1734 privlibexp (privlib.U):
1735 This variable is the ~name expanded version of privlib, so that you
1736 may use it directly in Makefiles or shell scripts.
1738 prototype (prototype.U):
1739 This variable holds the eventual value of CAN_PROTOTYPE, which
1740 indicates the C compiler can handle funciton prototypes.
1742 ptrsize (ptrsize.U):
1743 This variable contains the value of the PTRSIZE symbol, which
1744 indicates to the C program how many bytes there are in a pointer.
1746 randbits (randbits.U):
1747 This variable contains the eventual value of the RANDBITS symbol,
1748 which indicates to the C program how many bits of random number
1749 the rand() function produces.
1751 ranlib (orderlib.U):
1752 This variable is set to the pathname of the ranlib program, if it is
1753 needed to generate random libraries. Set to ":" if ar can generate
1754 random libraries or if random libraries are not supported
1756 rd_nodata (nblock_io.U):
1757 This variable holds the return code from read() when no data is
1758 present. It should be -1, but some systems return 0 when O_NDELAY is
1759 used, which is a shame because you cannot make the difference between
1760 no data and an EOF.. Sigh!
1763 This variable contains 'true' or 'false' depending whether the
1764 nm extraction should be performed or not, according to the value
1765 of usenm and the flags on the Configure command line.
1767 scriptdir (scriptdir.U):
1768 This variable holds the name of the directory in which the user wants
1769 to put publicly scripts for the package in question. It is either
1770 the same directory as for binaries, or a special one that can be
1771 mounted across different architectures, like /usr/share. Programs
1772 must be prepared to deal with ~name expansion.
1774 scriptdirexp (scriptdir.U):
1775 This variable is the same as scriptdir, but is filename expanded
1776 at configuration time, for programs not wanting to bother with it.
1778 selecttype (selecttype.U):
1779 This variable holds the type used for the 2nd, 3rd, and 4th
1780 arguments to select. Usually, this is 'fd_set *', if HAS_FD_SET
1781 is defined, and 'int *' otherwise. This is only useful if you
1782 have select(), naturally.
1785 This variable contains the full pathname of the shell used
1786 on this system to execute Bourne shell scripts. Usually, this will be
1787 /bin/sh, though it's possible that some systems will have /bin/ksh,
1788 /bin/pdksh, /bin/ash, /bin/bash, or even something such as
1790 This unit comes before Options.U, so you can't set sh with a -D
1791 option, though you can override this (and startsh)
1792 with -O -Dsh=/bin/whatever -Dstartsh=whatever
1794 sharpbang (spitshell.U):
1795 This variable contains the string #! if this system supports that
1798 shmattype (d_shmat.U):
1799 This symbol contains the type of pointer returned by shmat().
1800 It can be 'void *' or 'char *'.
1802 shortsize (intsize.U):
1803 This variable contains the value of the SHORTSIZE symbol which
1804 indicates to the C program how many bytes there are in a short.
1806 shrpenv (libperl.U):
1807 If the user builds a shared libperl.so, then we need to tell the
1808 'perl' executable where it will be able to find the installed libperl.so.
1809 One way to do this on some systems is to set the environment variable
1810 LD_RUN_PATH to the directory that will be the final location of the
1811 shared libperl.so. The makefile can use this with something like
1812 $shrpenv $(CC) -o perl perlmain.o $libperl $libs
1814 shrpenv="env LD_RUN_PATH=$archlibexp/CORE"
1817 See the main perl Makefile.SH for actual working usage.
1818 Alternatively, we might be able to use a command line option such
1819 as -R $archlibexp/CORE (Solaris, NetBSD) or -Wl,-rpath
1820 $archlibexp/CORE (Linux).
1822 shsharp (spitshell.U):
1823 This variable tells further Configure units whether your sh can
1826 sig_name (sig_name.U):
1827 This variable holds the signal names, space separated. The leading
1828 SIG in signal name is removed. A ZERO is prepended to the
1829 list. This is currently not used.
1831 sig_name_init (sig_name.U):
1832 This variable holds the signal names, enclosed in double quotes and
1833 separated by commas, suitable for use in the SIG_NAME definition
1834 below. A "ZERO" is prepended to the list, and the list is
1835 terminated with a plain 0. The leading SIG in signal names
1836 is removed. See sig_num.
1838 sig_num (sig_name.U):
1839 This variable holds the signal numbers, comma separated. A 0 is
1840 prepended to the list (corresponding to the fake SIGZERO), and
1841 the list is terminated with a 0. Those numbers correspond to
1842 the value of the signal listed in the same place within the
1845 signal_t (d_voidsig.U):
1846 This variable holds the type of the signal handler (void or int).
1848 sitearch (sitearch.U):
1849 This variable contains the eventual value of the SITEARCH symbol,
1850 which is the name of the private library for this package. It may
1851 have a ~ on the front. It is up to the makefile to eventually create
1852 this directory while performing installation (with ~ substitution).
1854 sitearchexp (sitearch.U):
1855 This variable is the ~name expanded version of sitearch, so that you
1856 may use it directly in Makefiles or shell scripts.
1858 sitelib (sitelib.U):
1859 This variable contains the eventual value of the SITELIB symbol,
1860 which is the name of the private library for this package. It may
1861 have a ~ on the front. It is up to the makefile to eventually create
1862 this directory while performing installation (with ~ substitution).
1864 sitelibexp (sitelib.U):
1865 This variable is the ~name expanded version of sitelib, so that you
1866 may use it directly in Makefiles or shell scripts.
1868 sizetype (sizetype.U):
1869 This variable defines sizetype to be something like size_t,
1870 unsigned long, or whatever type is used to declare length
1871 parameters for string functions.
1874 This variable contains a flag which will tell the C compiler and loader
1875 to produce a program running with a small memory model. It is up to
1876 the Makefile to use this.
1879 This variable holds the extension used to identify shared libraries
1880 (also known as shared objects) on the system. Usually set to 'so'.
1882 sockethdr (d_socket.U):
1883 This variable has any cpp -I flags needed for socket support.
1885 socketlib (d_socket.U):
1886 This variable has the names of any libraries needed for socket support.
1888 spackage (package.U):
1889 This variable contains the name of the package being constructed,
1890 with the first letter uppercased, i.e. suitable for starting
1893 spitshell (spitshell.U):
1894 This variable contains the command necessary to spit out a runnable
1895 shell on this system. It is either cat or a grep -v for # comments.
1898 This variable contains a flag which will tell the C compiler and loader
1899 to produce a program that will run in separate I and D space, for those
1900 machines that support separation of instruction and data space. It is
1901 up to the Makefile to use this.
1903 ssizetype (ssizetype.U):
1904 This variable defines ssizetype to be something like ssize_t,
1905 long or int. It is used by functions that return a count
1906 of bytes or an error condition. It must be a signed type.
1907 We will pick a type such that sizeof(SSize_t) == sizeof(Size_t).
1909 startperl (startperl.U):
1910 This variable contains the string to put on the front of a perl
1911 script to make sure (hopefully) that it runs with perl and not some
1912 shell. Of course, that leading line must be followed by the classical
1914 eval 'exec perl -S $0 ${1+"$@"}'
1915 if $running_under_some_shell;
1916 to guarantee perl startup should the shell execute the script. Note
1917 that this magic incatation is not understood by csh.
1919 startsh (startsh.U):
1920 This variable contains the string to put on the front of a shell
1921 script to make sure (hopefully) that it runs with sh and not some
1924 static_ext (Extensions.U):
1925 This variable holds a list of extension files we want to
1926 link statically into the package. It is used by Makefile.
1928 stdchar (stdchar.U):
1929 This variable conditionally defines STDCHAR to be the type of char
1930 used in stdio.h. It has the values "unsigned char" or "char".
1932 stdio_base (d_stdstdio.U):
1933 This variable defines how, given a FILE pointer, fp, to access the
1934 _base field (or equivalent) of stdio.h's FILE structure. This will
1935 be used to define the macro FILE_base(fp).
1937 stdio_bufsiz (d_stdstdio.U):
1938 This variable defines how, given a FILE pointer, fp, to determine
1939 the number of bytes store in the I/O buffer pointer to by the
1940 _base field (or equivalent) of stdio.h's FILE structure. This will
1941 be used to define the macro FILE_bufsiz(fp).
1943 stdio_cnt (d_stdstdio.U):
1944 This variable defines how, given a FILE pointer, fp, to access the
1945 _cnt field (or equivalent) of stdio.h's FILE structure. This will
1946 be used to define the macro FILE_cnt(fp).
1948 stdio_filbuf (d_stdstdio.U):
1949 This variable defines how, given a FILE pointer, fp, to tell
1950 stdio to refill it's internal buffers (?). This will
1951 be used to define the macro FILE_filbuf(fp).
1953 stdio_ptr (d_stdstdio.U):
1954 This variable defines how, given a FILE pointer, fp, to access the
1955 _ptr field (or equivalent) of stdio.h's FILE structure. This will
1956 be used to define the macro FILE_ptr(fp).
1958 strings (i_string.U):
1959 This variable holds the full path of the string header that will be
1960 used. Typically /usr/include/string.h or /usr/include/strings.h.
1962 subversion (patchlevel.U):
1963 The subversion level of this package.
1964 The value of subversion comes from the patchlevel.h file.
1965 This is unique to perl.
1968 This variable holds the place where the manual is located on this
1969 system. It is not the place where the user wants to put his manual
1970 pages. Rather it is the place where Configure may look to find manual
1971 for unix commands (section 1 of the manual usually). See mansrc.
1973 timeincl (i_time.U):
1974 This variable holds the full path of the included time header(s).
1976 timetype (d_time.U):
1977 This variable holds the type returned by time(). It can be long,
1978 or time_t on BSD sites (in which case <sys/types.h> should be
1979 included). Anyway, the type Time_t should be used.
1981 uidtype (uidtype.U):
1982 This variable defines Uid_t to be something like uid_t, int,
1983 ushort, or whatever type is used to declare user ids in the kernel.
1986 This variable indicates if the the system supports dynamic
1987 loading of some sort. See also dlsrc and dlobj.
1989 usemymalloc (mallocsrc.U):
1990 This variable contains y if the malloc that comes with this package
1991 is desired over the system's version of malloc. People often include
1992 special versions of malloc for effiency, but such versions are often
1993 less portable. See also mallocsrc and mallocobj.
1994 If this is 'y', then -lmalloc is removed from $libs.
1997 This variable contains 'true' or 'false' depending whether the
1998 nm extraction is wanted or not.
2000 useopcode (Extensions.U):
2001 This variable holds either 'true' or 'false' to indicate
2002 whether the Opcode extension should be used. The sole
2003 use for this currently is to allow an easy mechanism
2004 for users to skip the Opcode extension from the Configure
2007 useperlio (useperlio.U):
2008 This variable conditionally defines the USE_PERLIO symbol,
2009 and indicates that the PerlIO abstraction should be
2012 useposix (Extensions.U):
2013 This variable holds either 'true' or 'false' to indicate
2014 whether the POSIX extension should be used. The sole
2015 use for this currently is to allow an easy mechanism
2016 for hints files to indicate that POSIX will not compile
2017 on a particular system.
2020 This variable is set to true when the user agrees to use sfio.
2021 It is set to false when sfio is not available or when the user
2022 explicitely requests not to use sfio. It is here primarily so
2023 that command-line settings can override the auto-detection of
2024 d_sfio without running into a "WHOA THERE".
2026 useshrplib (libperl.U):
2027 This variable is set to 'yes' if the user wishes
2028 to build a shared libperl, and 'no' otherwise.
2030 usethreads (usethreads.U):
2031 This variable conditionally defines the USE_THREADS symbol,
2032 and indicates that Perl should be built to use threads.
2034 usevfork (d_vfork.U):
2035 This variable is set to true when the user accepts to use vfork.
2036 It is set to false when no vfork is available or when the user
2037 explicitely requests not to use vfork.
2040 This variable holds the path of the include files, which is
2041 usually /usr/include. It is mainly used by other Configure units.
2043 voidflags (voidflags.U):
2044 This variable contains the eventual value of the VOIDFLAGS symbol,
2045 which indicates how much support of the void type is given by this
2046 compiler. See VOIDFLAGS for more info.