$OpenBSD: patch-src_fmacros_h,v 1.1 2011/04/11 07:54:49 dcoppa Exp $
--- src/fmacros.h.orig	Fri Apr  8 12:37:59 2011
+++ src/fmacros.h	Fri Apr  8 12:38:11 2011
@@ -3,7 +3,7 @@
 
 #define _BSD_SOURCE
 
-#ifdef __linux__
+#if defined(__linux__) || defined(__OpenBSD__)
 #define _XOPEN_SOURCE 700
 #else
 #define _XOPEN_SOURCE
