diff -u checkpassword-0.90.old/error.h checkpassword-0.90/error.h
--- checkpassword-0.90.old/error.h	2000-12-23 00:40:46.000000000 -0600
+++ checkpassword-0.90/error.h	2003-01-14 00:49:57.000000000 -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;