$NetBSD: patch-ak,v 1.1 2006/01/24 19:01:45 joerg Exp $

--- lib/mbox.c.orig	2006-01-24 15:25:06.000000000 +0000
+++ lib/mbox.c
@@ -23,7 +23,6 @@ static char rcsid[] = "@(#)$Id: mbox.c,v
 DEBUG_VAR(Debug,__FILE__,"mbox");
 
 #include <errno.h>
-extern int errno;
 
 static unsigned char *s2us P_((char *str));
 static unsigned char *s2us(str)