diff -urN checkpassword-0.90/error.h checkpassword-0.90-modify/error.h
--- checkpassword-0.90/error.h	2000-12-23 07:40:46.000000000 +0100
+++ checkpassword-0.90-modify/error.h	2003-03-04 10:18:09.000000000 +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;