diff --git a/man3/a64l.3 b/man3/a64l.3
index 378e6cd44..0a2841ed2 100644
--- a/man3/a64l.3
+++ b/man3/a64l.3
@@ -27,8 +27,10 @@ Feature Test Macro Requirements for glibc (see
 .br
 .RS 4
 .ad l
-_SVID_SOURCE || _XOPEN_SOURCE\ >=\ 500
+_XOPEN_SOURCE\ >=\ 500
 .\"    || _XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED
+    || /* Glibc since 2.19: */ _DEFAULT_SOURCE
+    || /* Glibc versions <= 2.19: */ _SVID_SOURCE
 .RE
 .ad
 .SH DESCRIPTION
diff --git a/man3/atoi.3 b/man3/atoi.3
index 70788857e..19246b157 100644
--- a/man3/atoi.3
+++ b/man3/atoi.3
@@ -52,8 +52,8 @@ Feature Test Macro Requirements for glibc (see
 .ad l
 .BR atoll ():
 .RS 4
-_BSD_SOURCE || _SVID_SOURCE || _ISOC99_SOURCE ||
-_POSIX_C_SOURCE\ >=\ 200112L
+__ISOC99_SOURCE ||
+    || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
 .RE
 .ad
 .SH DESCRIPTION
diff --git a/man3/clearenv.3 b/man3/clearenv.3
index dd1bcca97..49f87d635 100644
--- a/man3/clearenv.3
+++ b/man3/clearenv.3
@@ -39,7 +39,8 @@ Feature Test Macro Requirements for glibc (see
 .in
 .sp
 .BR clearenv ():
-_SVID_SOURCE || _BSD_SOURCE
+    /* Glibc since 2.19: */ _DEFAULT_SOURCE
+        || /* Glibc versions <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE
 .SH DESCRIPTION
 The
 .BR clearenv ()
diff --git a/man3/drand48.3 b/man3/drand48.3
index 9fb994ec1..cbc74ee6e 100644
--- a/man3/drand48.3
+++ b/man3/drand48.3
@@ -70,7 +70,9 @@ All functions shown above:
 .\" .BR srand48 (),
 .\" .BR seed48 (),
 .\" .BR lcong48 ():
-_SVID_SOURCE || _XOPEN_SOURCE
+_XOPEN_SOURCE
+    || /* Glibc since 2.19: */ _DEFAULT_SOURCE
+    || /* Glibc versions <= 2.19: */ _SVID_SOURCE
 .ad b
 .SH DESCRIPTION
 These functions generate pseudo-random numbers using the linear congruential
diff --git a/man3/drand48_r.3 b/man3/drand48_r.3
index fb2f278d3..e438b750a 100644
--- a/man3/drand48_r.3
+++ b/man3/drand48_r.3
@@ -78,7 +78,8 @@ All functions shown above:
 .\" .BR srand48_r (),
 .\" .BR seed48_r (),
 .\" .BR lcong48_r ():
-_SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE
+    /* Glibc since 2.19: */ _DEFAULT_SOURCE
+        || /* Glibc versions <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE
 .ad b
 .SH DESCRIPTION
 These functions are the reentrant analogs of the functions described in
diff --git a/man3/ecvt.3 b/man3/ecvt.3
index 757f0b24a..6d400c09b 100644
--- a/man3/ecvt.3
+++ b/man3/ecvt.3
@@ -54,11 +54,9 @@ Feature Test Macro Requirements for glibc (see
 .TP 4
 Since glibc 2.12:
 .nf
-_SVID_SOURCE ||
-.\"    (_XOPEN_SOURCE\ >=\ 500 ||
-.\"        _XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED) &&
-    (_XOPEN_SOURCE\ >=\ 500)
-        ! (_POSIX_C_SOURCE\ >=\ 200112L)
+(_XOPEN_SOURCE\ >=\ 500) ! (_POSIX_C_SOURCE\ >=\ 200112L)
+    || /* Glibc since 2.19: */ _DEFAULT_SOURCE
+    || /* Glibc versions <= 2.19: */ _SVID_SOURCE
 .fi
 .TP 4
 Before glibc 2.12:
diff --git a/man3/ecvt_r.3 b/man3/ecvt_r.3
index d92047053..6025a2a80 100644
--- a/man3/ecvt_r.3
+++ b/man3/ecvt_r.3
@@ -58,7 +58,8 @@ Feature Test Macro Requirements for glibc (see
 .BR qecvt_r (),
 .BR qfcvt_r ():
 .RS 4
-_SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE\ >=\ 500
+/* Glibc since 2.19: */ _DEFAULT_SOURCE
+    || /* Glibc versions <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE
 .RE
 .ad b
 .SH DESCRIPTION
diff --git a/man3/gcvt.3 b/man3/gcvt.3
index 9f9b99a1f..58bf44883 100644
--- a/man3/gcvt.3
+++ b/man3/gcvt.3
@@ -49,11 +49,9 @@ Feature Test Macro Requirements for glibc (see
 .TP 4
 Since glibc 2.12:
 .nf
-_SVID_SOURCE ||
-.\"    (_XOPEN_SOURCE\ >=\ 500 ||
-.\"        _XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED) &&
-    (_XOPEN_SOURCE\ >=\ 500) &&
-        ! (_POSIX_C_SOURCE\ >=\ 200112L)
+(_XOPEN_SOURCE\ >=\ 500) ! (_POSIX_C_SOURCE\ >=\ 200112L)
+    || /* Glibc since 2.19: */ _DEFAULT_SOURCE
+    || /* Glibc versions <= 2.19: */ _SVID_SOURCE
 .fi
 .TP 4
 Before glibc 2.12:
diff --git a/man3/mkstemp.3 b/man3/mkstemp.3
index 4dfe4031b..7264ae588 100644
--- a/man3/mkstemp.3
+++ b/man3/mkstemp.3
@@ -57,10 +57,10 @@ Feature Test Macro Requirements for glibc (see
 .ad l
 .RS 4
 .PD 0
-_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 500
+_XOPEN_SOURCE\ >=\ 500
 .\"    || _XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED
-.br
     || /* Since glibc 2.12: */ _POSIX_C_SOURCE\ >=\ 200112L
+    || /* Glibc versions <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE
 .PD
 .RE
 .ad b
@@ -69,7 +69,8 @@ _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 500
 _GNU_SOURCE
 .br
 .BR mkstemps ():
-_BSD_SOURCE || _SVID_SOURCE
+    /* Glibc since 2.19: */ _DEFAULT_SOURCE
+        || /* Glibc versions <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE
 .br
 .BR mkostemps ():
 _GNU_SOURCE
diff --git a/man3/mktemp.3 b/man3/mktemp.3
index 09351cbce..213ecb73b 100644
--- a/man3/mktemp.3
+++ b/man3/mktemp.3
@@ -52,11 +52,9 @@ Feature Test Macro Requirements for glibc (see
 .RS 4
 .TP 4
 Since glibc 2.12:
-_BSD_SOURCE || _SVID_SOURCE ||
-.\"    (_XOPEN_SOURCE\ >=\ 500 ||
-.\"         _XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED) &&
-    (_XOPEN_SOURCE\ >=\ 500) &&
-        ! (_POSIX_C_SOURCE\ >=\ 200112L)
+(_XOPEN_SOURCE\ >=\ 500) && ! (_POSIX_C_SOURCE\ >=\ 200112L)
+    || /* Glibc since 2.19: */ _DEFAULT_SOURCE
+    || /* Glibc <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE
 .TP
 Before glibc 2.12:
 _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 500
diff --git a/man3/posix_memalign.3 b/man3/posix_memalign.3
index fea9dc5f6..dfbefa7ea 100644
--- a/man3/posix_memalign.3
+++ b/man3/posix_memalign.3
@@ -62,11 +62,9 @@ _ISOC11_SOURCE
 .TP 4
 Since glibc 2.12:
 .nf
-_BSD_SOURCE ||
-.\"    (_XOPEN_SOURCE\ >=\ 500 ||
-.\"        _XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED) &&
-    (_XOPEN_SOURCE\ >=\ 500) &&
-        !(_POSIX_C_SOURCE\ >=\ 200112L)
+(_XOPEN_SOURCE\ >=\ 500) && !(_POSIX_C_SOURCE\ >=\ 200112L)
+    || /* Glibc since 2.19: */ _DEFAULT_SOURCE
+    || /* Glibc versions <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE
 .br
 .fi
 .TP
diff --git a/man3/putenv.3 b/man3/putenv.3
index 3054be710..1d796a743 100644
--- a/man3/putenv.3
+++ b/man3/putenv.3
@@ -50,7 +50,9 @@ Feature Test Macro Requirements for glibc (see
 .in
 .sp
 .BR putenv ():
-_SVID_SOURCE || _XOPEN_SOURCE
+_XOPEN_SOURCE
+    || /* Glibc since 2.19: */ _DEFAULT_SOURCE
+    || /* Glibc versions <= 2.19: */ _SVID_SOURCE
 .SH DESCRIPTION
 The
 .BR putenv ()
diff --git a/man3/random.3 b/man3/random.3
index 4c81eb010..dc104f8fc 100644
--- a/man3/random.3
+++ b/man3/random.3
@@ -57,8 +57,10 @@ Feature Test Macro Requirements for glibc (see
 .BR initstate (),
 .BR setstate ():
 .RS 4
-_SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE\ >=\ 500
+_XOPEN_SOURCE\ >=\ 500
 .\"    || _XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED
+    || /* Glibc since 2.19: */ _DEFAULT_SOURCE
+    || /* Glibc versions <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE
 .RE
 .ad
 .SH DESCRIPTION
diff --git a/man3/random_r.3 b/man3/random_r.3
index fdc4de6f0..6ff3696c2 100644
--- a/man3/random_r.3
+++ b/man3/random_r.3
@@ -52,7 +52,8 @@ Feature Test Macro Requirements for glibc (see
 .BR initstate_r (),
 .BR setstate_r ():
 .RS 4
-_SVID_SOURCE || _BSD_SOURCE
+/* Glibc since 2.19: */ _DEFAULT_SOURCE
+    || /* Glibc versions <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE
 .RE
 .ad b
 .SH DESCRIPTION
diff --git a/man3/realpath.3 b/man3/realpath.3
index ffde120cd..1877b38e4 100644
--- a/man3/realpath.3
+++ b/man3/realpath.3
@@ -44,8 +44,10 @@ Feature Test Macro Requirements for glibc (see
 .BR realpath ():
 .ad l
 .RS 4
-_BSD_SOURCE || _XOPEN_SOURCE\ >=\ 500
+_XOPEN_SOURCE\ >=\ 500
 .\"    || _XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED
+    || /* Glibc since 2.19: */ _DEFAULT_SOURCE
+    || /* Glibc versions <= 2.19: */ _BSD_SOURCE
 .RE
 .ad
 .SH DESCRIPTION
diff --git a/man3/setenv.3 b/man3/setenv.3
index d2d6cd72e..5a6a050ba 100644
--- a/man3/setenv.3
+++ b/man3/setenv.3
@@ -55,7 +55,8 @@ Feature Test Macro Requirements for glibc (see
 .BR setenv (),
 .BR unsetenv ():
 .RS 4
-_BSD_SOURCE || _POSIX_C_SOURCE\ >=\ 200112L
+_POSIX_C_SOURCE\ >=\ 200112L
+    || /* Glibc versions <= 2.19: */ _BSD_SOURCE
 .RE
 .ad b
 .SH DESCRIPTION
diff --git a/man3/strtol.3 b/man3/strtol.3
index c79ffe0b4..bd05667d9 100644
--- a/man3/strtol.3
+++ b/man3/strtol.3
@@ -49,8 +49,8 @@ Feature Test Macro Requirements for glibc (see
 .ad l
 .BR strtoll ():
 .RS 4
-_BSD_SOURCE || _SVID_SOURCE || _ISOC99_SOURCE ||
-_POSIX_C_SOURCE\ >=\ 200112L
+_ISOC99_SOURCE
+    || /* Glibc versions <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE
 .RE
 .ad
 .SH DESCRIPTION
diff --git a/man3/strtoul.3 b/man3/strtoul.3
index 2f9fafe6a..fc31e3016 100644
--- a/man3/strtoul.3
+++ b/man3/strtoul.3
@@ -52,8 +52,8 @@ Feature Test Macro Requirements for glibc (see
 .ad l
 .BR strtoull ():
 .RS 4
-_BSD_SOURCE || _SVID_SOURCE || _ISOC99_SOURCE ||
-_POSIX_C_SOURCE\ >=\ 200112L
+_ISOC99_SOURCE ||
+    || /* Glibc versions <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE
 .RE
 .ad
 .SH DESCRIPTION