$OpenBSD: patch-support_stdio_c,v 1.1 2013/12/04 21:31:13 naddy Exp $
--- support/stdio.c.orig	Tue Nov 15 18:22:44 2011
+++ support/stdio.c	Wed Dec  4 21:39:35 2013
@@ -26,7 +26,7 @@ Mono_Posix_Syscall_L_ctermid (void)
 gint32
 Mono_Posix_Syscall_L_cuserid (void)
 {
-#ifdef __APPLE__
+#if defined(__APPLE__) || defined(__OpenBSD__)
 	return -1;
 #else
 	return L_cuserid;