Index: teardrops.c
===================================================================
--- teardrops.c	(revision 4523)
+++ teardrops.c	(revision 4524)
@@ -17,6 +17,7 @@
 #include <math.h>
 
 #include "config.h"
+#include "math_helper.h"
 #include "board.h"
 #include "config.h"
 #include "data.h"