diff -urN dot-forward-0.71/error.h dot-forward-0.71-copy/error.h
--- dot-forward-0.71/error.h	1998-05-19 12:15:50.000000000 +0200
+++ dot-forward-0.71-copy/error.h	2003-03-04 09:24:33.000000000 +0100
@@ -1,6 +1,9 @@
 #ifndef ERROR_H
 #define ERROR_H
 
+#include <sys/errno.h>
+#include <errno.h>
+
 extern int errno;
 
 extern int error_intr;