--- Tools/DefMod2/vapi.c.orig	2017-09-19 11:57:15.559547484 +0100
+++ Tools/DefMod2/vapi.c	2017-09-19 11:57:31.067750029 +0100
@@ -23,6 +23,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <ctype.h>
+#include <stdbool.h>
 
 #include "oslib/os.h"