--- sysdeps/linux-gnu/proc.c.orig	2012-11-24 14:16:38.143412974 -0500
+++ sysdeps/linux-gnu/proc.c	2012-11-24 14:15:37.118929507 -0500
@@ -21,7 +21,9 @@
  * 02110-1301 USA
  */
 
+#ifndef _GNU_SOURCE
 #define _GNU_SOURCE /* For getline.  */
+#endif
 #include "config.h"
 
 #include <sys/stat.h>
--- handle_event.c.orig	2012-11-24 14:18:49.381152430 -0500
+++ handle_event.c	2012-11-24 14:19:04.720771399 -0500
@@ -25,7 +25,9 @@
 
 #include "config.h"
 
+#ifndef _GNU_SOURCE
 #define _GNU_SOURCE
+#endif
 #include <assert.h>
 #include <errno.h>
 #include <signal.h>
--- output.c.orig	2012-11-24 14:20:09.904152447 -0500
+++ output.c	2012-11-24 14:20:33.040577878 -0500
@@ -24,7 +24,9 @@
 
 /* glibc before 2.10, eglibc and uClibc all need _GNU_SOURCE defined
  * for open_memstream to become visible.  */
+#ifndef _GNU_SOURCE
 #define _GNU_SOURCE
+#endif
 
 #include "config.h"