Index: config.auto.h.in
===================================================================
--- config.auto.h.in	(revision 2540)
+++ config.auto.h.in	(revision 2541)
@@ -52,10 +52,6 @@
 #ifndef _ALL_SOURCE
 # define _ALL_SOURCE 1
 #endif
-/* Enable GNU extensions on systems that have them.  */
-#ifndef _GNU_SOURCE
-# define _GNU_SOURCE 1
-#endif
 /* Enable threading extensions on Solaris.  */
 #ifndef _POSIX_PTHREAD_SEMANTICS
 # define _POSIX_PTHREAD_SEMANTICS 1