$NetBSD: patch-aa,v 1.4 2014/09/25 13:47:59 jperkin Exp $

--- igs/datetime.cc.orig	2008-04-21 17:41:47.000000000 +0000
+++ igs/datetime.cc
@@ -7,7 +7,10 @@
  * published by the Free Software Foundation.
  */
 
+#ifndef __sun
 #define _XOPEN_SOURCE
+#endif
+#define _NETBSD_SOURCE
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE 1
 #endif