--- a/lib/C/iec_std_lib.h	Fri Apr 20 17:38:09 2018 +0100
+++ b/lib/C/iec_std_lib.h	Fri Apr 20 17:40:29 2018 +0100
@@ -35,6 +35,7 @@
 #include <math.h>
 #include <stdint.h>
 #include <ctype.h>
+#include <time.h>
 
 #include <stdio.h>
 #include <stdlib.h>