diff --git a/man2/getresuid.2 b/man2/getresuid.2
index 08af31b99..6319a765d 100644
--- a/man2/getresuid.2
+++ b/man2/getresuid.2
@@ -61,4 +61,5 @@ provided _GNU_SOURCE is defined.
 .BR getuid (2),
 .BR setresuid (2),
 .BR setreuid (2),
-.BR setuid (2)
+.BR setuid (2),
+.BR feature_test_macros (7)
diff --git a/man2/mremap.2 b/man2/mremap.2
index 6fbf6a204..d03ea5648 100644
--- a/man2/mremap.2
+++ b/man2/mremap.2
@@ -182,7 +182,8 @@ call with completely different semantics.
 .BR mmap (2),
 .BR sbrk (2),
 .BR malloc (3),
-.BR realloc (3)
+.BR realloc (3),
+.BR feature_test_macros (7)
 .P
 Your favorite OS text book for more information on paged memory.
 (\fIModern Operating Systems\fR by Andrew S. Tannenbaum, 
diff --git a/man2/nanosleep.2 b/man2/nanosleep.2
index d6fbcc5fb..bc433cfe5 100644
--- a/man2/nanosleep.2
+++ b/man2/nanosleep.2
@@ -147,4 +147,5 @@ POSIX.1-2001.
 .BR sched_setscheduler (2),
 .BR timer_create (2),
 .BR sleep (3),
-.BR usleep (3)
+.BR usleep (3),
+.BR feature_test_macros (7)
diff --git a/man2/posix_fadvise.2 b/man2/posix_fadvise.2
index 79093f11e..5b718c50a 100644
--- a/man2/posix_fadvise.2
+++ b/man2/posix_fadvise.2
@@ -128,4 +128,5 @@ rather than as meaning "all bytes through to the end of the file".
 .SH "SEE ALSO"
 .BR posix_madvise (2),
 .BR readahead (2),
-.BR posix_fallocate (3) 
+.BR posix_fallocate (3) ,
+.BR feature_test_macros (7)
diff --git a/man2/pread.2 b/man2/pread.2
index 96156852a..907a7c0a6 100644
--- a/man2/pread.2
+++ b/man2/pread.2
@@ -84,4 +84,5 @@ without the system calls) was added in glibc 2.1.
 .SH "SEE ALSO"
 .BR lseek (2),
 .BR read (2),
-.BR write (2)
+.BR write (2),
+.BR feature_test_macros (7)
diff --git a/man2/remap_file_pages.2 b/man2/remap_file_pages.2
index 8a1346346..a997bdf68 100644
--- a/man2/remap_file_pages.2
+++ b/man2/remap_file_pages.2
@@ -154,4 +154,5 @@ system call is Linux specific.
 .BR mmap2 (2),
 .BR mprotect (2),
 .BR mremap (2),
-.BR msync (2)
+.BR msync (2),
+.BR feature_test_macros (7)
diff --git a/man2/setresuid.2 b/man2/setresuid.2
index 978391260..6690cebf3 100644
--- a/man2/setresuid.2
+++ b/man2/setresuid.2
@@ -95,4 +95,5 @@ provided _GNU_SOURCE is defined.
 .BR setfsgid (2),
 .BR setreuid (2),
 .BR setuid (2),
-.BR capabilities (7)
+.BR capabilities (7),
+.BR feature_test_macros (7)
diff --git a/man2/splice.2 b/man2/splice.2
index 9c9674cf3..8719f97fd 100644
--- a/man2/splice.2
+++ b/man2/splice.2
@@ -215,4 +215,5 @@ This system call is Linux specific.
 .SH SEE ALSO
 .BR sendfile (2),
 .BR splice (2),
-.BR tee (2)
+.BR tee (2),
+.BR feature_test_macros (7)
diff --git a/man2/stime.2 b/man2/stime.2
index 33bf3272f..ce7f02017 100644
--- a/man2/stime.2
+++ b/man2/stime.2
@@ -65,4 +65,5 @@ is defined.
 .SH "SEE ALSO"
 .BR date (1),
 .BR settimeofday (2),
-.BR capabilities (7)
+.BR capabilities (7),
+.BR feature_test_macros (7)
diff --git a/man2/sync_file_range.2 b/man2/sync_file_range.2
index 5dbb7b0a0..e1402848d 100644
--- a/man2/sync_file_range.2
+++ b/man2/sync_file_range.2
@@ -165,4 +165,5 @@ appeared on Linux in kernel 2.6.17.
 .BR fdatasync (2),
 .BR fsync (2),
 .BR msync (2),
-.BR sync (2)
+.BR sync (2),
+.BR feature_test_macros (7)
diff --git a/man2/tee.2 b/man2/tee.2
index 672c11192..3a793ce46 100644
--- a/man2/tee.2
+++ b/man2/tee.2
@@ -192,4 +192,5 @@ system call first appeared in Linux-2.6.17.
 This system call is Linux specific.
 .SH SEE ALSO
 .BR splice (2),
-.BR vmsplice (2)
+.BR vmsplice (2),
+.BR feature_test_macros (7)
diff --git a/man2/vmsplice.2 b/man2/vmsplice.2
index 168645ccd..aa272301b 100644
--- a/man2/vmsplice.2
+++ b/man2/vmsplice.2
@@ -151,4 +151,5 @@ system call first appeared in Linux-2.6.17.
 This system call is Linux specific.
 .SH SEE ALSO
 .BR splice (2),
-.BR tee (2)
+.BR tee (2),
+.BR feature_test_macros (7)
diff --git a/man2/wait4.2 b/man2/wait4.2
index 501491481..2d9173d4c 100644
--- a/man2/wait4.2
+++ b/man2/wait4.2
@@ -134,4 +134,5 @@ defined in
 .BR sigaction (2),
 .BR signal (2),
 .BR wait (2),
+.BR feature_test_macros (7),
 .BR signal (7)
diff --git a/man3/INFINITY.3 b/man3/INFINITY.3
index a856b6bab..d2b2efa86 100644
--- a/man3/INFINITY.3
+++ b/man3/INFINITY.3
@@ -74,4 +74,5 @@ and has a value not less than 199901L.
 .SH "CONFORMING TO"
 C99
 .SH "SEE ALSO"
-.BR fpclassify (3)
+.BR fpclassify (3),
+.BR feature_test_macros (7)
diff --git a/man3/addseverity.3 b/man3/addseverity.3
index 8905e14cf..26bccf1ba 100644
--- a/man3/addseverity.3
+++ b/man3/addseverity.3
@@ -52,4 +52,5 @@ although the
 function is.  It is available on System V
 systems.
 .SH "SEE ALSO"
-.BR fmtmsg (3)
+.BR fmtmsg (3),
+.BR feature_test_macros (7)
diff --git a/man3/adjtime.3 b/man3/adjtime.3
index 7e137005f..622539ff8 100644
--- a/man3/adjtime.3
+++ b/man3/adjtime.3
@@ -128,4 +128,5 @@ This is the result of a kernel limitation.
 .SH "SEE ALSO"
 .BR adjtimex (2),
 .BR gettimeofday (2),
+.BR feature_test_macros (7),
 .BR time(7)
diff --git a/man3/asprintf.3 b/man3/asprintf.3
index e55ba18e1..9e228ec85 100644
--- a/man3/asprintf.3
+++ b/man3/asprintf.3
@@ -65,4 +65,5 @@ to NULL on error.
 .SH "SEE ALSO"
 .BR free (3),
 .BR malloc (3),
-.BR printf (3)
+.BR printf (3),
+.BR feature_test_macros (7)
diff --git a/man3/assert_perror.3 b/man3/assert_perror.3
index dd08575f4..8892e618c 100644
--- a/man3/assert_perror.3
+++ b/man3/assert_perror.3
@@ -66,4 +66,5 @@ but by proper error handling code. Never use this macro.
 .BR abort (3),
 .BR assert (3),
 .BR exit (3),
-.BR strerror (3)
+.BR strerror (3),
+.BR feature_test_macros (7)
diff --git a/man3/basename.3 b/man3/basename.3
index 63ca86a8f..2deb5cc33 100644
--- a/man3/basename.3
+++ b/man3/basename.3
@@ -162,4 +162,5 @@ and generated a segfault if given a NULL argument.
 POSIX.1-2001
 .SH "SEE ALSO"
 .BR basename (1),
-.BR dirname (1)
+.BR dirname (1),
+.BR feature_test_macros (7)
diff --git a/man3/canonicalize_file_name.3 b/man3/canonicalize_file_name.3
index 469082017..6113d53ee 100644
--- a/man3/canonicalize_file_name.3
+++ b/man3/canonicalize_file_name.3
@@ -21,4 +21,5 @@ is equivalent to the call
 .SH "CONFORMING TO"
 The function is a GNU extension.
 .SH "SEE ALSO"
-.BR realpath (3)
+.BR realpath (3),
+.BR feature_test_macros (7)
diff --git a/man3/clog10.3 b/man3/clog10.3
index 88386eb29..46e751fc5 100644
--- a/man3/clog10.3
+++ b/man3/clog10.3
@@ -37,4 +37,5 @@ It is reserved for future use in C99.
 .BR cexp (3),
 .BR clog (3),
 .BR clog2 (3),
-.BR complex (7)
+.BR complex (7),
+.BR feature_test_macros (7)
diff --git a/man3/confstr.3 b/man3/confstr.3
index 5c516dedb..70d5f0e96 100644
--- a/man3/confstr.3
+++ b/man3/confstr.3
@@ -135,4 +135,5 @@ POSIX.1-2001
 .SH "SEE ALSO"
 .BR sh (1),
 .BR exec (3),
-.BR system (3)
+.BR system (3),
+.BR feature_test_macros (7)
diff --git a/man3/crypt.3 b/man3/crypt.3
index 1ba0bec8b..d010baea5 100644
--- a/man3/crypt.3
+++ b/man3/crypt.3
@@ -152,4 +152,5 @@ SVr4, 4.3BSD, POSIX.1-2001
 .BR passwd (1),
 .BR encrypt (3),
 .BR getpass (3),
-.BR passwd (5)
+.BR passwd (5),
+.BR feature_test_macros (7)
diff --git a/man3/dl_iterate_phdr.3 b/man3/dl_iterate_phdr.3
index 7fccb373f..c04de5bf2 100644
--- a/man3/dl_iterate_phdr.3
+++ b/man3/dl_iterate_phdr.3
@@ -188,6 +188,7 @@ function is Linux specific and should be avoided in portable applications.
 .BR objdump (1),
 .BR readelf (1),
 .BR dlopen (3),
+.BR feature_test_macros (7),
 .BR ld.so (8),
 and the
 .I "Executable and Linking Format Specification"
diff --git a/man3/dlopen.3 b/man3/dlopen.3
index f435ea276..9224a39ba 100644
--- a/man3/dlopen.3
+++ b/man3/dlopen.3
@@ -430,6 +430,7 @@ and
 .BR ld (1),
 .BR ldd (1),
 .BR dl_iterate_phdr (3),
+.BR feature_test_macros (7)
 .BR ld.so (8),
 .BR ldconfig (8),
 ld.so info pages, gcc info pages, ld info pages
diff --git a/man3/dprintf.3 b/man3/dprintf.3
index d8128e7d4..12459e066 100644
--- a/man3/dprintf.3
+++ b/man3/dprintf.3
@@ -71,4 +71,5 @@ A better name would have been
 .SH "CONFORMING TO"
 These functions are GNU extensions.
 .SH "SEE ALSO"
-.BR printf (3)
+.BR printf (3),
+.BR feature_test_macros (7)
diff --git a/man3/dysize.3 b/man3/dysize.3
index 31dfc3b5e..6f19fbd63 100644
--- a/man3/dysize.3
+++ b/man3/dysize.3
@@ -49,4 +49,5 @@ This is a compatibility function only.  Don't use it in new programs.
 The SCO version of this function had a year-2000 problem.
 .SH "SEE ALSO"
 .BR strftime (3),
-.BR time (3)
+.BR time (3),
+.BR feature_test_macros (7)
diff --git a/man3/exp10.3 b/man3/exp10.3
index ff827b0ac..8c59f9ee8 100644
--- a/man3/exp10.3
+++ b/man3/exp10.3
@@ -54,4 +54,5 @@ The function is a GNU extension.
 .BR cbrt (3),
 .BR exp (3),
 .BR exp2 (3),
-.BR sqrt (3)
+.BR sqrt (3),
+.BR feature_test_macros (7)
diff --git a/man3/fcloseall.3 b/man3/fcloseall.3
index 43009b682..05ae7f66b 100644
--- a/man3/fcloseall.3
+++ b/man3/fcloseall.3
@@ -50,4 +50,5 @@ This function is a GNU extension.
 .BR fclose (3),
 .BR fflush (3),
 .BR fopen (3),
-.BR setbuf (3)
+.BR setbuf (3),
+.BR feature_test_macros (7)
diff --git a/man3/fenv.3 b/man3/fenv.3
index eaaeaa523..ed82494cd 100644
--- a/man3/fenv.3
+++ b/man3/fenv.3
@@ -253,3 +253,5 @@ Link with
 .BR \-lm .
 .SH "CONFORMING TO"
 IEC 60559 (IEC 559:1989), ANSI/IEEE 854, C99.
+.SH "SEE ALSO"
+.BR feature_test_macros (7)
diff --git a/man3/ffs.3 b/man3/ffs.3
index da2165e9d..539b0dc59 100644
--- a/man3/ffs.3
+++ b/man3/ffs.3
@@ -62,3 +62,5 @@ or 0 if no bits are set in
 .SH NOTES
 BSD systems have a prototype in
 .IR <string.h> .
+.SH "SEE ALSO"
+.BR feature_test_macros (7)
diff --git a/man3/fmemopen.3 b/man3/fmemopen.3
index d96cd3637..0b31911dd 100644
--- a/man3/fmemopen.3
+++ b/man3/fmemopen.3
@@ -199,4 +199,5 @@ These functions are GNU extensions.
 .\" Jan 06: But they appear to be going up for standardization by
 .\" POSIX/PASC/IEEE.
 .SH "SEE ALSO"
-.BR open (3)
+.BR open (3),
+.BR feature_test_macros (7)
diff --git a/man3/ftw.3 b/man3/ftw.3
index 137fd79da..5896bf74b 100644
--- a/man3/ftw.3
+++ b/man3/ftw.3
@@ -344,4 +344,5 @@ main(int argc, char *argv[])
 .SH "SEE ALSO"
 .BR stat (2),
 .BR fts (3),
-.BR readdir (3)
+.BR readdir (3),
+.BR feature_test_macros (7)
diff --git a/man3/getdirentries.3 b/man3/getdirentries.3
index dacbb170b..df524c749 100644
--- a/man3/getdirentries.3
+++ b/man3/getdirentries.3
@@ -65,4 +65,5 @@ and
 instead.
 .SH "SEE ALSO"
 .BR lseek (2),
-.BR open (2)
+.BR open (2),
+.BR feature_test_macros (7)
diff --git a/man3/getgrent_r.3 b/man3/getgrent_r.3
index 1e5862df2..84d603c42 100644
--- a/man3/getgrent_r.3
+++ b/man3/getgrent_r.3
@@ -169,4 +169,5 @@ in the stream with all other threads.
 .BR getgrgid (3),
 .BR getgrnam (3),
 .BR putgrent (3),
-.BR group (5)
+.BR group (5),
+.BR feature_test_macros (7)
diff --git a/man3/getline.3 b/man3/getline.3
index 48875fe86..cd69eafc5 100644
--- a/man3/getline.3
+++ b/man3/getline.3
@@ -136,4 +136,5 @@ They are available since libc 4.6.27.
 .BR fopen (3),
 .BR fread (3),
 .BR gets (3),
-.BR scanf (3)
+.BR scanf (3),
+.BR feature_test_macros (7)
diff --git a/man3/getloadavg.3 b/man3/getloadavg.3
index c6b20f75d..a3e41b338 100644
--- a/man3/getloadavg.3
+++ b/man3/getloadavg.3
@@ -54,7 +54,8 @@ If the load average was unobtainable, \-1 is returned; otherwise,
 the number of samples actually retrieved is returned.
 .Sh SEE ALSO
 .Xr uptime 1 ,
-.Xr proc 5
+.Xr proc 5,
+.Xr feature_test_macros 7
 .Sh HISTORY
 The
 .Fn getloadavg
diff --git a/man3/getmntent.3 b/man3/getmntent.3
index a4c2edf41..ed9647f2c 100644
--- a/man3/getmntent.3
+++ b/man3/getmntent.3
@@ -151,4 +151,5 @@ a wrapper around the system call \fBgetfsstat\fP().
 .SH "SEE ALSO"
 .BR fopen (3),
 .BR fstab (5),
+.BR feature_test_macros (7),
 .BR mount (8)
diff --git a/man3/getopt.3 b/man3/getopt.3
index 0c5e64546..dd2013db5 100644
--- a/man3/getopt.3
+++ b/man3/getopt.3
@@ -413,3 +413,5 @@ POSIX.1-2001 marked the use of
 for this purpose as LEGACY.  
 POSIX.1-2001 does not allow the declaration to appear in
 .IR <stdio.h> .
+.SH "SEE ALSO"
+.BR feature_test_macros (7)
diff --git a/man3/getpwent_r.3 b/man3/getpwent_r.3
index 4e1730fce..abd4aeac7 100644
--- a/man3/getpwent_r.3
+++ b/man3/getpwent_r.3
@@ -168,4 +168,5 @@ in the stream with all other threads.
 .BR getpwnam (3),
 .BR getpwuid (3),
 .BR putpwent (3),
-.BR passwd (5)
+.BR passwd (5),
+.BR feature_test_macros (7)
diff --git a/man3/getspnam.3 b/man3/getspnam.3
index d2f2f9b3e..0eca3bb08 100644
--- a/man3/getspnam.3
+++ b/man3/getspnam.3
@@ -229,4 +229,5 @@ However, many other systems provide a similar API.
 .BR getgrnam (3),
 .BR getpwnam (3),
 .BR getpwnam_r (3),
-.BR shadow (5)
+.BR shadow (5),
+.BR feature_test_macros (7)
diff --git a/man3/getutent.3 b/man3/getutent.3
index c046ebc66..130a81893 100644
--- a/man3/getutent.3
+++ b/man3/getutent.3
@@ -197,4 +197,5 @@ Linux glibc on the other hand does not use \fIutmpx\fP since its
 \fIutmp\fP structure is already large enough. The functions \fIgetutxent\fP
 etc. are aliases for \fIgetutent\fP etc.
 .SH "SEE ALSO"
-.BR utmp (5)
+.BR utmp (5),
+.BR feature_test_macros (7)
diff --git a/man3/grantpt.3 b/man3/grantpt.3
index 55391b0da..597f901a6 100644
--- a/man3/grantpt.3
+++ b/man3/grantpt.3
@@ -58,4 +58,5 @@ called "pt_chown". With Linux devpts no such helper binary is required.
 .BR ptsname (3),
 .BR unlockpt (3),
 .BR pts (4),
+.BR feature_test_macros (7),
 .BR pty (7)
diff --git a/man3/hsearch.3 b/man3/hsearch.3
index ba98ebaaf..1034dac3b 100644
--- a/man3/hsearch.3
+++ b/man3/hsearch.3
@@ -194,4 +194,5 @@ some of them.
 .BR bsearch (3),
 .BR lsearch (3),
 .BR malloc (3),
-.BR tsearch (3)
+.BR tsearch (3),
+.BR feature_test_macros (7)
diff --git a/man3/j0.3 b/man3/j0.3
index bd5278b36..564946771 100644
--- a/man3/j0.3
+++ b/man3/j0.3
@@ -102,3 +102,5 @@ POSIX.1-2001.
 .SH BUGS
 There are errors of up to 2e\-16 in the values returned by \fBj0\fP(),
 \fBj1\fP() and \fBjn\fP() for values of \fIx\fP between \-8 and 8.
+.SH "SEE ALSO"
+.BR feature_test_macros (7)
diff --git a/man3/lseek64.3 b/man3/lseek64.3
index ad5287782..ca1b0f89e 100644
--- a/man3/lseek64.3
+++ b/man3/lseek64.3
@@ -158,4 +158,5 @@ For more details, see
 .BR llseek (2).
 .SH "SEE ALSO"
 .BR llseek (2),
-.BR lseek (2)
+.BR lseek (2),
+.BR feature_test_macros (7)
diff --git a/man3/memmem.3 b/man3/memmem.3
index b12153c78..c0aac5955 100644
--- a/man3/memmem.3
+++ b/man3/memmem.3
@@ -60,4 +60,5 @@ Both old and new libc's have the bug that if \fIneedle\fP is empty
 And glibc 2.0 makes it worse, and returns a pointer to the
 last byte of `haystack'. This is fixed in glibc 2.1.
 .SH "SEE ALSO"
-.BR strstr (3)
+.BR strstr (3),
+.BR feature_test_macros (7)
diff --git a/man3/mempcpy.3 b/man3/mempcpy.3
index 7393dd3cf..4e389a826 100644
--- a/man3/mempcpy.3
+++ b/man3/mempcpy.3
@@ -63,4 +63,5 @@ This function is a GNU extension.
 .BR memccpy (3),
 .BR memcpy (3),
 .BR memmove (3),
-.BR wmemcpy (3)
+.BR wmemcpy (3),
+.BR feature_test_macros (7)
diff --git a/man3/mq_receive.3 b/man3/mq_receive.3
index 3c5215051..020906fc9 100644
--- a/man3/mq_receive.3
+++ b/man3/mq_receive.3
@@ -145,4 +145,5 @@ POSIX.1-2001.
 .BR mq_open (3),
 .BR mq_send (3),
 .BR mq_unlink (3),
+.BR feature_test_macros (7),
 .BR mq_overview (7)
diff --git a/man3/mq_send.3 b/man3/mq_send.3
index a464f529b..c78000367 100644
--- a/man3/mq_send.3
+++ b/man3/mq_send.3
@@ -150,4 +150,5 @@ POSIX.1-2001.
 .BR mq_open (3),
 .BR mq_receive (3),
 .BR mq_unlink (3),
+.BR feature_test_macros (7),
 .BR mq_overview (7)
diff --git a/man3/posix_fallocate.3 b/man3/posix_fallocate.3
index e2d6c24bd..906252217 100644
--- a/man3/posix_fallocate.3
+++ b/man3/posix_fallocate.3
@@ -91,4 +91,5 @@ is available since glibc 2.1.94.
 POSIX.1-2001.
 .SH "SEE ALSO"
 .BR lseek (2),
-.BR posix_fadvise (2)
+.BR posix_fadvise (2),
+.BR feature_test_macros (7)
diff --git a/man3/posix_openpt.3 b/man3/posix_openpt.3
index b0a01f9c4..b4fd0a2d0 100644
--- a/man3/posix_openpt.3
+++ b/man3/posix_openpt.3
@@ -89,4 +89,5 @@ posix_openpt(int flags)
 .BR ptsname (3),
 .BR unlock (3),
 .BR pts (4),
+.BR feature_test_macros (7),
 .BR pty (7)
diff --git a/man3/pow10.3 b/man3/pow10.3
index 6e3b369b8..bf9b91cba 100644
--- a/man3/pow10.3
+++ b/man3/pow10.3
@@ -46,4 +46,5 @@ These functions are identical to the functions listed under
 .BR exp10 (3).
 .SH "SEE ALSO"
 .BR exp10 (3),
-.BR pow (3)
+.BR pow (3),
+.BR feature_test_macros (7)
diff --git a/man3/program_invocation_name.3 b/man3/program_invocation_name.3
index 6479fa717..6aaf84d6f 100644
--- a/man3/program_invocation_name.3
+++ b/man3/program_invocation_name.3
@@ -58,4 +58,5 @@ file provides access to similar information.
 These variables are GNU extensions, and should not be
 used in programs intended to be portable.
 .SH SEE ALSO
-.BR proc (5)
+.BR proc (5),
+.BR feature_test_macros (7)
diff --git a/man3/ptsname.3 b/man3/ptsname.3
index 9bb5043b0..4469d922a 100644
--- a/man3/ptsname.3
+++ b/man3/ptsname.3
@@ -91,4 +91,5 @@ Avoid using this function in portable programs.
 .BR ttyname (3),
 .BR unlockpt (3),
 .BR pts (4),
+.BR feature_test_macros (7),
 .BR pty (7)
diff --git a/man3/putgrent.3 b/man3/putgrent.3
index 69da6695c..4dae93757 100644
--- a/man3/putgrent.3
+++ b/man3/putgrent.3
@@ -40,4 +40,5 @@ This function is a GNU extension.
 .SH "SEE ALSO"
 .BR fgetgrent (3),
 .BR getgrent (3),
-.BR group (5)
+.BR group (5),
+.BR feature_test_macros (7)
diff --git a/man3/remquo.3 b/man3/remquo.3
index 05101ee97..cf3e6a33a 100644
--- a/man3/remquo.3
+++ b/man3/remquo.3
@@ -51,4 +51,5 @@ C99
 .SH "SEE ALSO"
 .BR fmod (3),
 .BR logb (3),
-.BR remainder (3)
+.BR remainder (3),
+.BR feature_test_macros (7)
diff --git a/man3/rpmatch.3 b/man3/rpmatch.3
index e9fc2261f..50cde896a 100644
--- a/man3/rpmatch.3
+++ b/man3/rpmatch.3
@@ -107,4 +107,5 @@ main(int argc, char *argv[])
 .BR fgets (3),
 .BR getline (3),
 .BR nl_langinfo (3),
-.BR setlocale (3)
+.BR setlocale (3),
+.BR feature_test_macros (7)
diff --git a/man3/sem_wait.3 b/man3/sem_wait.3
index 5116ae286..d9ceaf8be 100644
--- a/man3/sem_wait.3
+++ b/man3/sem_wait.3
@@ -249,4 +249,5 @@ main(int argc, char *argv[])
 .\" .BR clock_gettime (3),
 .BR sem_getvalue (3),
 .BR sem_post (3),
+.BR feature_test_macros (7),
 .BR sem_overview (7)
diff --git a/man3/sigset.3 b/man3/sigset.3
index 5b3f44506..6d507e01f 100644
--- a/man3/sigset.3
+++ b/man3/sigset.3
@@ -254,4 +254,5 @@ These functions are obsolete: do not use them in new programs.
 .BR raise (3),
 .BR sigpause (3),
 .BR sigvec (3),
+.BR feature_test_macros (7),
 .BR signal (7)
diff --git a/man3/sigvec.3 b/man3/sigvec.3
index 04ad1a9a0..7fe8a5d68 100644
--- a/man3/sigvec.3
+++ b/man3/sigvec.3
@@ -245,4 +245,5 @@ These functions are obsolete: do not use them in new programs.
 .BR raise (3),
 .BR sigpause (3),
 .BR sigset (3),
+.BR feature_test_macros (7),
 .BR signal (7)
diff --git a/man3/sincos.3 b/man3/sincos.3
index e97999d02..cefc66667 100644
--- a/man3/sincos.3
+++ b/man3/sincos.3
@@ -27,4 +27,5 @@ This function is a GNU extension.
 .SH "SEE ALSO"
 .BR cos (3),
 .BR sin (3),
-.BR tan (3)
+.BR tan (3),
+.BR feature_test_macros (7)
diff --git a/man3/stpcpy.3 b/man3/stpcpy.3
index 1da9b2b6a..8671a2f1a 100644
--- a/man3/stpcpy.3
+++ b/man3/stpcpy.3
@@ -68,4 +68,5 @@ Perhaps it comes from MS-DOS.
 .BR memcpy (3),
 .BR memmove (3),
 .BR strcpy (3),
-.BR wcpcpy (3)
+.BR wcpcpy (3),
+.BR feature_test_macros (7)
diff --git a/man3/stpncpy.3 b/man3/stpncpy.3
index 27c9b910a..12f9703bd 100644
--- a/man3/stpncpy.3
+++ b/man3/stpncpy.3
@@ -41,4 +41,5 @@ in \fIdest\fP, or, if \fIdest\fP is not null-terminated,
 This function is a GNU extension.
 .SH "SEE ALSO"
 .BR strncpy (3),
-.BR wcpncpy (3)
+.BR wcpncpy (3),
+.BR feature_test_macros (7)
diff --git a/man3/strchr.3 b/man3/strchr.3
index 7179be2d2..9e8459f89 100644
--- a/man3/strchr.3
+++ b/man3/strchr.3
@@ -81,4 +81,5 @@ if the character is not found.
 .BR strstr (3),
 .BR strtok (3),
 .BR wcschr (3),
-.BR wcsrchr (3)
+.BR wcsrchr (3),
+.BR feature_test_macros (7)
diff --git a/man3/strdup.3 b/man3/strdup.3
index 8b659f95c..ce9dd5673 100644
--- a/man3/strdup.3
+++ b/man3/strdup.3
@@ -77,4 +77,5 @@ conforms to SVr4, 4.3BSD, POSIX.1-2001.
 .BR free (3),
 .BR malloc (3),
 .BR realloc (3),
-.BR wcsdup (3)
+.BR wcsdup (3),
+.BR feature_test_macros (7)
diff --git a/man3/strerror.3 b/man3/strerror.3
index ae14a32bd..2755d604e 100644
--- a/man3/strerror.3
+++ b/man3/strerror.3
@@ -146,4 +146,5 @@ if the error number is unknown.
 .BR errno (3),
 .BR error (3),
 .BR perror (3),
-.BR strsignal (3)
+.BR strsignal (3),
+.BR feature_test_macros (7)
diff --git a/man3/strfry.3 b/man3/strfry.3
index 4c2a908fe..bf5c79b3d 100644
--- a/man3/strfry.3
+++ b/man3/strfry.3
@@ -47,4 +47,5 @@ string.
 The \fBstrfry\fP() function is unique to the 
 GNU C Library.
 .SH "SEE ALSO"
-.BR memfrob (3)
+.BR memfrob (3),
+.BR feature_test_macros (7)
diff --git a/man3/strnlen.3 b/man3/strnlen.3
index 28e34fb56..9e106b28b 100644
--- a/man3/strnlen.3
+++ b/man3/strnlen.3
@@ -31,4 +31,5 @@ The \fBstrnlen\fP() function returns \fIstrlen(s)\fP, if that is less than
 .SH "CONFORMING TO"
 This function is a GNU extension.
 .SH "SEE ALSO"
-.BR strlen (3)
+.BR strlen (3),
+.BR feature_test_macros (7)
diff --git a/man3/strptime.3 b/man3/strptime.3
index 0e86ddfca..6b7a4eacf 100644
--- a/man3/strptime.3
+++ b/man3/strptime.3
@@ -364,4 +364,5 @@ in the range 1950-2049 by glibc 2.0. It is taken to be a year in
 .BR getdate (3),
 .BR scanf (3),
 .BR setlocale (3),
-.BR strftime (3)
+.BR strftime (3),
+.BR feature_test_macros (7)
diff --git a/man3/strsignal.3 b/man3/strsignal.3
index 2db56cf01..19104f45b 100644
--- a/man3/strsignal.3
+++ b/man3/strsignal.3
@@ -56,4 +56,5 @@ This function is not part of any standard, but aside from
 Linux, it can be found on Solaris and the BSDs.
 .SH "SEE ALSO"
 .BR psignal (3),
-.BR strerror (3)
+.BR strerror (3),
+.BR feature_test_macros (7)
diff --git a/man3/strstr.3 b/man3/strstr.3
index 3ddca69a8..a6ca12c5f 100644
--- a/man3/strstr.3
+++ b/man3/strstr.3
@@ -71,4 +71,5 @@ The \fBstrcasestr\fP() function is a non-standard extension.
 .BR strsep (3),
 .BR strspn (3),
 .BR strtok (3),
-.BR wcsstr (3)
+.BR wcsstr (3),
+.BR feature_test_macros (7)
diff --git a/man3/strtod.3 b/man3/strtod.3
index e12098a61..b73fe035c 100644
--- a/man3/strtod.3
+++ b/man3/strtod.3
@@ -162,4 +162,5 @@ the use of the functions described in this manual page is similar.
 .BR atoi (3),
 .BR atol (3),
 .BR strtol (3),
-.BR strtoul (3)
+.BR strtoul (3),
+.BR feature_test_macros (7)
diff --git a/man3/strverscmp.3 b/man3/strverscmp.3
index 22d91e6a7..77103ea11 100644
--- a/man3/strverscmp.3
+++ b/man3/strverscmp.3
@@ -82,4 +82,5 @@ This function is a GNU extension.
 .BR rename (1),
 .BR strcasecmp (3),
 .BR strcmp (3),
-.BR strcoll (3)
+.BR strcoll (3),
+.BR feature_test_macros (7)
diff --git a/man3/swab.3 b/man3/swab.3
index 79e1f815d..a3b5abfae 100644
--- a/man3/swab.3
+++ b/man3/swab.3
@@ -51,4 +51,5 @@ The \fBswab\fP() function returns no value.
 .SH "CONFORMING TO"
 SVr4, 4.3BSD, POSIX.1-2001
 .SH "SEE ALSO"
-.BR bstring (3)
+.BR bstring (3),
+.BR feature_test_macros (7)
diff --git a/man3/syslog.3 b/man3/syslog.3
index ef773ee2e..b423dd2f6 100644
--- a/man3/syslog.3
+++ b/man3/syslog.3
@@ -293,4 +293,5 @@ instead.
 .BR logger (1),
 .BR setlogmask (3),
 .BR syslog.conf (5),
+.BR feature_test_macros (7),
 .BR syslogd (8)
diff --git a/man3/tsearch.3 b/man3/tsearch.3
index dfce3e580..d19fa033b 100644
--- a/man3/tsearch.3
+++ b/man3/tsearch.3
@@ -197,4 +197,5 @@ is a GNU extension.
 .BR bsearch (3),
 .BR hsearch (3),
 .BR lsearch (3),
-.BR qsort (3)
+.BR qsort (3),
+.BR feature_test_macros (7)
diff --git a/man3/unlockpt.3 b/man3/unlockpt.3
index 987691176..ef0553451 100644
--- a/man3/unlockpt.3
+++ b/man3/unlockpt.3
@@ -45,4 +45,5 @@ POSIX.1-2001.
 .BR posix_openpt (3),
 .BR ptsname (3),
 .BR pts (4),
+.BR feature_test_macros (7),
 .BR pty (7)
diff --git a/man3/wcpcpy.3 b/man3/wcpcpy.3
index f1a52e5bb..61c58cbed 100644
--- a/man3/wcpcpy.3
+++ b/man3/wcpcpy.3
@@ -38,4 +38,5 @@ wide characters at \fIdest\fP.
 This function is a GNU extension.
 .SH "SEE ALSO"
 .BR strcpy (3),
-.BR wcscpy (3)
+.BR wcscpy (3),
+.BR feature_test_macros (7)
diff --git a/man3/wcpncpy.3 b/man3/wcpncpy.3
index ac208aa30..f921858bd 100644
--- a/man3/wcpncpy.3
+++ b/man3/wcpncpy.3
@@ -43,4 +43,5 @@ characters at \fIdest\fP.
 This function is a GNU extension.
 .SH "SEE ALSO"
 .BR stpncpy (3),
-.BR wcsncpy (3)
+.BR wcsncpy (3),
+.BR feature_test_macros (7)
diff --git a/man3/wcsdup.3 b/man3/wcsdup.3
index 0048db54b..bb72fc77a 100644
--- a/man3/wcsdup.3
+++ b/man3/wcsdup.3
@@ -40,4 +40,5 @@ This function is a GNU extension.
 .\" present in libc5 and glibc 2.0 and later
 .SH "SEE ALSO"
 .BR strdup (3),
-.BR wcscpy (3)
+.BR wcscpy (3),
+.BR feature_test_macros (7)
diff --git a/man3/wcwidth.3 b/man3/wcwidth.3
index 649861d8b..5059f5bae 100644
--- a/man3/wcwidth.3
+++ b/man3/wcwidth.3
@@ -34,9 +34,10 @@ Note that glibc before 2.2.5 used the prototype
 .nf
 .BI "int wcwidth(wint_t " c );
 .fi
-.SH "SEE ALSO"
-.BR iswprint (3),
-.BR wcswidth (3)
 .SH NOTES
 The behaviour of \fBwcwidth\fP() depends on the LC_CTYPE category of the
 current locale.
+.SH "SEE ALSO"
+.BR iswprint (3),
+.BR wcswidth (3),
+.BR feature_test_macros (7)