diff -r 31553c22f318 -r e666763ac743 lib/iec_std_lib.h
--- a/lib/iec_std_lib.h	Thu Nov 15 22:28:53 2012 +0100
+++ b/lib/iec_std_lib.h	Fri Nov 16 00:39:35 2012 +0100
@@ -31,6 +31,7 @@
 #include <math.h>
 #include <time.h>
 #include <stdint.h>
+#include <ctype.h>
 
 #include <stdio.h>
 #include <stdlib.h>