--- a/lib/C/iec_std_lib.h	Fri Feb 02 18:36:15 2018 +0000
+++ b/lib/C/iec_std_lib.h	Thu Mar 01 19:28:38 2018 +0000
@@ -35,6 +35,7 @@
 #include <math.h>
 #include <stdint.h>
 #include <ctype.h>
+#include <time.h>
 
 #include <stdio.h>
 #include <stdlib.h>