--- src/gmtmath.c.orig	2016-03-07 01:35:42 UTC
+++ src/gmtmath.c
@@ -61,11 +61,7 @@
  */
 
 /* Circumvent Solaris problem. See bug #817 */
-#ifdef __FreeBSD__
-#define _XOPEN_SOURCE
-#else
 #define _XOPEN_SOURCE 600
-#endif
 
 #include "gmt.h"