From 667d75d059384b12a4cd167a9aebc0c1c3057ef4 Mon Sep 17 00:00:00 2001
From: Ross Lagerwall <rosslagerwall@gmail.com>
Date: Thu, 22 Dec 2011 09:45:53 +0200
Subject: [PATCH] Don't redefine _GNU_SOURCE if it's already defined.

---
 Modules/_posixsubprocess.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Modules/_posixsubprocess.c b/Modules/_posixsubprocess.c
index 4e38bbe63f0..e8aedeb9fca 100644
--- a/Modules/_posixsubprocess.c
+++ b/Modules/_posixsubprocess.c
@@ -1,7 +1,7 @@
 /* Authors: Gregory P. Smith & Jeffrey Yasskin */
 #include "Python.h"
-#ifdef HAVE_PIPE2
-#define _GNU_SOURCE
+#if defined(HAVE_PIPE2) && !defined(_GNU_SOURCE)
+# define _GNU_SOURCE
 #endif
 #include <unistd.h>
 #include <fcntl.h>