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Patch from teh Debian package
--- ./error.h.orig	1998-08-30 23:39:27.000000000 +0200
+++ ./error.h	2006-10-22 21:09:02.000000000 +0200
@@ -1,7 +1,7 @@
 #ifndef ERROR_H
 #define ERROR_H

-extern int errno;
+#include <errno.h>

 extern int error_intr;
 extern int error_nomem;