$NetBSD$

--- xgraph.c.orig	2005-12-19 16:09:11.000000000 +0000
+++ xgraph.c
@@ -2662,7 +2662,6 @@ XErrorEvent *evt;
 
 
 #include <errno.h>
-extern int errno;
 #ifndef __WIN32__
 #define HAVE_MMAP
 #endif
