$OpenBSD: patch-os_internal_c,v 1.3 2012/01/19 16:14:11 sthen Exp $
--- src/utils/os_internal.c.orig	Tue May 29 03:08:48 2007
+++ src/utils/os_internal.c	Sat Jan 14 12:52:53 2012
@@ -178,7 +178,7 @@ int os_setenv(const char *name, const char *value, int
 
 int os_unsetenv(const char *name)
 {
-#if defined(__FreeBSD__) || defined(__NetBSD__)
+#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
 	unsetenv(name);
 	return 0;
 #else
