From 83151ec2bbd8405bd33cadcdc2f1d05b74b1e826 Mon Sep 17 00:00:00 2001
From: jsteube <jens.steube@gmail.com>
Date: Thu, 29 Dec 2016 19:13:06 +0100
Subject: [PATCH] Do not set _GNU_SOURCE if it's set already

---
 include/common.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/common.h b/include/common.h
index 09dba8221..f8881fff2 100644
--- a/include/common.h
+++ b/include/common.h
@@ -22,7 +22,10 @@
 #error Your Operating System is not supported or detected
 #endif
 
+#ifndef _GNU_SOURCE
 #define _GNU_SOURCE
+#endif
+
 #define _FILE_OFFSET_BITS 64
 
 #define NOMINMAX 1