2 files changed, 6 insertions, 1 deletions
diff --git a/ChangeLog b/ChangeLog
index a0b83569..deb83046 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
 2014-06-04  Kaz Kylheku  <kaz@kylheku.com>
 
+	* configure (lang_flags): drop -D_POSIX_C_SOURCE=199309L.
+	This is subsumed by -D_XOPEN_SOURCE=500.
+
+2014-06-04  Kaz Kylheku  <kaz@kylheku.com>
+
 	* configure: Typo in diagnostic output: wspawnlp.
 
 2014-06-04  Kaz Kylheku  <kaz@kylheku.com>
diff --git a/configure b/configure
index c112b7f7..9c3a8dd8 100755
--- a/configure
+++ b/configure
@@ -97,7 +97,7 @@ yacc='$(cross)$(tool_prefix)$(yaccname)'
 yacc_given=
 nm='$(cross)$(tool_prefix)nm'
 opt_flags=-O2
-lang_flags='-ansi -D_BSD_SOURCE -D_XOPEN_SOURCE=500 -D_POSIX_C_SOURCE=199309L'
+lang_flags='-ansi -D_BSD_SOURCE -D_XOPEN_SOURCE=500'
 diag_flags='-Wall -Werror=implicit-function-declaration -Werror=missing-prototypes -Werror=strict-prototypes'
 debug_flags=-g
 inline=