Index: trunk/MagicSoft/Cosy/caos/Ring.cc
===================================================================
--- trunk/MagicSoft/Cosy/caos/Ring.cc	(revision 9435)
+++ trunk/MagicSoft/Cosy/caos/Ring.cc	(revision 9515)
@@ -2,4 +2,6 @@
 
 #include <iostream>
+
+#include <math.h>
 
 #include "Led.h"