$NetBSD: patch-aj,v 1.1 2005/06/04 10:44:29 wiz Exp $

--- agrep/maskgen.c.orig	2002-09-27 23:41:09.000000000 +0200
+++ agrep/maskgen.c
@@ -8,7 +8,9 @@ extern int AND, REGEX, NOUPPER, D_length
 extern unsigned char Progname[];
 extern int agrep_initialfd;
 extern int EXITONERROR;
+#ifndef errno
 extern int errno;
+#endif
 
 int
 maskgen(Pattern, D)