$NetBSD: patch-ab,v 1.1 2005/12/09 13:47:58 joerg Exp $

--- bm_unix.c.orig	2005-12-09 13:38:29.000000000 +0000
+++ bm_unix.c
@@ -25,6 +25,7 @@
 
 
 #include "bmore.h"
+#include <errno.h>
 #include <termios.h>
 
 #define TBUFSIZ 1024
@@ -257,7 +258,6 @@ int
 vgetc()
 {
     char cha;
-    extern int errno;
 
     errno = 0;
     if (read(2, &cha, 1) <= 0) {