From 06c6fd9feb997a96610365b6280cf20484b143e1 Mon Sep 17 00:00:00 2001
From: Aaron Culliney <devnull@deadc0de.org>
Date: Tue, 22 Oct 2013 21:18:03 -0700
Subject: [PATCH] don't redefine if defined already

---
 src/common.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/common.h b/src/common.h
index 92180ac7..1ccf63ed 100644
--- a/src/common.h
+++ b/src/common.h
@@ -12,7 +12,7 @@
 #ifndef _COMMON_H_
 #define _COMMON_H_
 
-#if defined(__GNUC__)
+#if defined(__GNUC__) && !defined(_GNU_SOURCE)
 #   define _GNU_SOURCE
 #endif