From 048d1eb9132455948079c217ba1c5de9ff8e5f35 Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Mon, 11 Mar 2019 14:30:10 -0400
Subject: libgomp/config/posix/lock.c: fix _XOPEN_SOURCE feature-test
 re-definition bug.

---
 libgomp/config/posix/lock.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libgomp/config/posix/lock.c b/libgomp/config/posix/lock.c
index 8cd715e64..6c9194f25 100644
--- a/libgomp/config/posix/lock.c
+++ b/libgomp/config/posix/lock.c
@@ -34,8 +34,10 @@
    the declarations are available without _XOPEN_SOURCE, which actually
    breaks compilation.  */
 #ifndef __osf__
+#ifndef _XOPEN_SOURCE
 #define _XOPEN_SOURCE 500
 #endif
+#endif
 
 #include "libgomp.h"
 
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