diff -u dot-forward-0.71.orig/error.h dot-forward-0.71/error.h
--- dot-forward-0.71.orig/error.h	1998-05-19 05:15:50.000000000 -0500
+++ dot-forward-0.71/error.h	2004-01-29 11:16:01.000000000 -0600
@@ -1,7 +1,7 @@
 #ifndef ERROR_H
 #define ERROR_H
 
-extern int errno;
+#include <errno.h>
 
 extern int error_intr;
 extern int error_nomem;