diff --git a/man2/kill.2 b/man2/kill.2
index 9ef0670af..99459adf6 100644
--- a/man2/kill.2
+++ b/man2/kill.2
@@ -60,7 +60,7 @@ Feature Test Macro Requirements for glibc (see
 .sp
 .ad l
 .BR kill ():
-_POSIX_C_SOURCE\ >=\ 1 || _XOPEN_SOURCE
+_POSIX_C_SOURCE
 .ad b
 .SH DESCRIPTION
 The
diff --git a/man2/sigaction.2 b/man2/sigaction.2
index fad6ea307..3704e749b 100644
--- a/man2/sigaction.2
+++ b/man2/sigaction.2
@@ -64,7 +64,7 @@ Feature Test Macro Requirements for glibc (see
 .sp
 .ad l
 .BR sigaction ():
-_POSIX_C_SOURCE\ >=\ 1 || _XOPEN_SOURCE
+_POSIX_C_SOURCE
 
 .IR siginfo_t :
 _POSIX_C_SOURCE >= 199309L
diff --git a/man2/sigpending.2 b/man2/sigpending.2
index 71bbcda6e..5eed82df2 100644
--- a/man2/sigpending.2
+++ b/man2/sigpending.2
@@ -41,7 +41,7 @@ Feature Test Macro Requirements for glibc (see
 .sp
 .ad l
 .BR sigpending ():
-_POSIX_C_SOURCE\ >=\ 1 || _XOPEN_SOURCE
+_POSIX_C_SOURCE
 .ad b
 .SH DESCRIPTION
 .PP
diff --git a/man2/sigprocmask.2 b/man2/sigprocmask.2
index 806b663c7..d0f7d9b4b 100644
--- a/man2/sigprocmask.2
+++ b/man2/sigprocmask.2
@@ -42,7 +42,7 @@ Feature Test Macro Requirements for glibc (see
 .sp
 .ad l
 .BR sigprocmask ():
-_POSIX_C_SOURCE\ >=\ 1 || _XOPEN_SOURCE
+_POSIX_C_SOURCE
 .ad b
 .SH DESCRIPTION
 .BR sigprocmask ()
diff --git a/man2/sigsuspend.2 b/man2/sigsuspend.2
index 3e2eee002..d8e4a8e80 100644
--- a/man2/sigsuspend.2
+++ b/man2/sigsuspend.2
@@ -41,7 +41,7 @@ Feature Test Macro Requirements for glibc (see
 .sp
 .ad l
 .BR sigsuspend ():
-_POSIX_C_SOURCE\ >=\ 1 || _XOPEN_SOURCE
+_POSIX_C_SOURCE
 .ad b
 .SH DESCRIPTION
 .BR sigsuspend ()
diff --git a/man3/ctermid.3 b/man3/ctermid.3
index 74d6fdc00..1d872aa06 100644
--- a/man3/ctermid.3
+++ b/man3/ctermid.3
@@ -41,8 +41,7 @@ Feature Test Macro Requirements for glibc (see
 .in
 .sp
 .BR ctermid ():
-_POSIX_C_SOURCE\ >=\ 1 || _XOPEN_SOURCE
-.\" From <unistd.h>: _XOPEN_SOURCE
+_POSIX_C_SOURCE
 .SH DESCRIPTION
 .BR ctermid ()
 returns a string which is the pathname for the current
diff --git a/man3/ferror.3 b/man3/ferror.3
index 4f904af8a..acccd4d43 100644
--- a/man3/ferror.3
+++ b/man3/ferror.3
@@ -61,7 +61,7 @@ Feature Test Macro Requirements for glibc (see
 .in
 .sp
 .BR fileno ():
-_POSIX_C_SOURCE\ >=\ 1 || _XOPEN_SOURCE
+_POSIX_C_SOURCE
 .SH DESCRIPTION
 The function
 .BR clearerr ()
diff --git a/man3/fopen.3 b/man3/fopen.3
index 2ce338b91..2ce86335f 100644
--- a/man3/fopen.3
+++ b/man3/fopen.3
@@ -61,7 +61,7 @@ Feature Test Macro Requirements for glibc (see
 .in
 .sp
 .BR fdopen ():
-_POSIX_C_SOURCE\ >=\ 1 || _XOPEN_SOURCE
+_POSIX_C_SOURCE
 .SH DESCRIPTION
 The
 .BR fopen ()
diff --git a/man3/getaddrinfo.3 b/man3/getaddrinfo.3
index 334e1cdf9..567aacd7f 100644
--- a/man3/getaddrinfo.3
+++ b/man3/getaddrinfo.3
@@ -70,7 +70,7 @@ Feature Test Macro Requirements for glibc (see
 .BR freeaddrinfo (),
 .BR gai_strerror ():
 .RS 4
-_POSIX_C_SOURCE\ >=\ 1 || _XOPEN_SOURCE
+_POSIX_C_SOURCE
 .RE
 .ad b
 .SH DESCRIPTION
diff --git a/man3/getnameinfo.3 b/man3/getnameinfo.3
index 6d72280fb..94d22f1c2 100644
--- a/man3/getnameinfo.3
+++ b/man3/getnameinfo.3
@@ -27,7 +27,7 @@ Feature Test Macro Requirements for glibc (see
 .in
 .sp
 .BR getnameinfo ():
-_POSIX_C_SOURCE\ >=\ 1 || _XOPEN_SOURCE
+_POSIX_C_SOURCE
 .ad b
 .SH DESCRIPTION
 The
diff --git a/man3/rand.3 b/man3/rand.3
index fe76f2937..c7b796a86 100644
--- a/man3/rand.3
+++ b/man3/rand.3
@@ -58,7 +58,7 @@ Feature Test Macro Requirements for glibc (see
 .in
 .sp
 .BR rand_r ():
-_POSIX_C_SOURCE\ >=\ 1 || _XOPEN_SOURCE
+_POSIX_C_SOURCE
 .SH DESCRIPTION
 The
 .BR rand ()
diff --git a/man3/setjmp.3 b/man3/setjmp.3
index 99aeb728a..c7f8540f6 100644
--- a/man3/setjmp.3
+++ b/man3/setjmp.3
@@ -46,9 +46,8 @@ Feature Test Macro Requirements for glibc (see
 .BR setjmp ():
     see NOTES.
 .br
-.BR sigsetjmp (),
-.BR siglongjmp ():
-    _POSIX_C_SOURCE\ >=\ 1 || _XOPEN_SOURCE || _POSIX_C_SOURCE
+.BR sigsetjmp ():
+_POSIX_C_SOURCE
 .SH DESCRIPTION
 The functions described on this page are used for performing "nonlocal gotos":
 transferring execution from one function to a predetermined location
diff --git a/man3/sigsetops.3 b/man3/sigsetops.3
index a739bbbab..8b3250f57 100644
--- a/man3/sigsetops.3
+++ b/man3/sigsetops.3
@@ -57,7 +57,7 @@ Feature Test Macro Requirements for glibc (see
 .BR sigdelset (),
 .BR sigismember ():
 .RS 4
-_POSIX_C_SOURCE\ >=\ 1 || _XOPEN_SOURCE
+_POSIX_C_SOURCE
 .RE
 .ad b
 .SH DESCRIPTION
diff --git a/man3/sigwait.3 b/man3/sigwait.3
index a9d2aa010..5bd976daf 100644
--- a/man3/sigwait.3
+++ b/man3/sigwait.3
@@ -40,7 +40,7 @@ Feature Test Macro Requirements for glibc (see
 .sp
 .ad l
 .BR sigwait ():
-_POSIX_C_SOURCE\ >=\ 1 || _XOPEN_SOURCE
+_POSIX_C_SOURCE
 .ad b
 .SH DESCRIPTION
 The
diff --git a/man3/tzset.3 b/man3/tzset.3
index c827c5078..acf72128e 100644
--- a/man3/tzset.3
+++ b/man3/tzset.3
@@ -50,10 +50,10 @@ Feature Test Macro Requirements for glibc (see
 .in
 .sp
 .BR tzset ():
-_POSIX_C_SOURCE\ >=\ 1 || _XOPEN_SOURCE
+_POSIX_C_SOURCE
 .br
 .IR tzname :
-_POSIX_C_SOURCE\ >=\ 1 || _XOPEN_SOURCE
+_POSIX_C_SOURCE
 .br
 .IR timezone ,
 .IR daylight :