--- a/glcddriver.c	
+++ a/glcddriver.c	
@@ -4,6 +4,7 @@ 
  *
  * (c) 2005-2009 Lucian Muresan <lucianm AT users.sourceforge.net>
  */
+#include <stdio.h>
 #include <syslog.h>
 #include <stdlib.h>
 #include "glcddriver.h"