--- plugin/workbook.c.orig	2010-11-25 16:42:23 UTC
+++ plugin/workbook.c
@@ -24,6 +24,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <glib.h>
+#include <wchar.h>
 
 #include "libgretl.h"