$NetBSD: patch-ac,v 1.13 2002/08/25 18:40:32 jlam Exp $

--- zvt/subshell-includes.h.orig	Fri Jun 15 02:04:52 2001
+++ zvt/subshell-includes.h	Thu Aug  1 15:15:35 2002
@@ -3,7 +3,7 @@
 
 #include <stdio.h>      
 #include <fcntl.h>	/* for close-on-exec stuff	      */
-#ifndef _XOPEN_SOURCE
+#if !defined(__NetBSD__) && !defined(_XOPEN_SOURCE)
 #define _XOPEN_SOURCE 1
 #endif
 #define __EXTENSIONS__ 1	/* needed for winsize struct