From e3271e0c994c4f0c88e749d0eedda12d501ef583 Mon Sep 17 00:00:00 2001
From: "Roger A. Light" <roger@atchoo.org>
Date: Thu, 25 Jul 2019 21:08:00 +0100
Subject: [PATCH] Don't define _GNU_SOURCE where already defined. Closes #1357.

---
 config.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/config.h b/config.h
index f717d00c..5cce39ee 100644
--- a/config.h
+++ b/config.h
@@ -16,7 +16,10 @@
 #  define _POSIX_C_SOURCE 200809L
 #endif
 
-#define _GNU_SOURCE
+
+#ifndef _GNU_SOURCE
+#  define _GNU_SOURCE
+#endif
 
 #define OPENSSL_LOAD_CONF