$OpenBSD: patch-src_data_c,v 1.1 2016/03/17 21:08:28 naddy Exp $
--- src/data.c.orig	Wed Sep 15 09:04:59 2004
+++ src/data.c	Thu Mar 17 22:04:56 2016
@@ -55,7 +55,7 @@
 #include <stats.h>
 #include <config.h>
 
-extern int errno, verbose, progress, bits;
+extern int verbose, progress, bits;
 extern tnode_t **treap;
 extern bnode_t *bintree;
 size_t size = 0;