From cca1925d25094f2a0b5f4ef5e564708fa876c5af Mon Sep 17 00:00:00 2001
From: "Gary E. Miller" <gem@rellim.com>
Date: Mon, 15 Aug 2016 19:57:10 -0700
Subject: C99 requires _XOPEN_SOURCE 500 for M_LN2

---
 driver_tsip.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'driver_tsip.c')

diff --git a/driver_tsip.c b/driver_tsip.c
index 5e09433b..c87a1064 100644
--- a/driver_tsip.c
+++ b/driver_tsip.c
@@ -12,6 +12,11 @@
  * This file is Copyright (c) 2010 by the GPSD project
  * BSD terms apply: see the file COPYING in the distribution root for details.
  */
+
+/* if we insist on C99, then we need this to get M_LN2 from math.h */
+/* 500 mean X/Open 1995 */
+#define _XOPEN_SOURCE 500
+
 #include <sys/time.h>		/* for select() */
 #include <string.h>
 #include <stdio.h>
-- 
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