Index: trunk/MagicSoft/Mars/manalysis/MHillas.cc
===================================================================
--- trunk/MagicSoft/Mars/manalysis/MHillas.cc	(revision 708)
+++ trunk/MagicSoft/Mars/manalysis/MHillas.cc	(revision 713)
@@ -9,4 +9,6 @@
 /////////////////////////////////////////////////////////////////////////////
 #include "MHillas.h"
+
+#include <math.h>
 
 #include <TEllipse.h>