--- a/src/point-to-point-layout/model/point-to-point-star.cc	Fri Aug 31 12:24:28 2012 +0200
+++ b/src/point-to-point-layout/model/point-to-point-star.cc	Sat Sep 01 20:57:21 2012 +0200
@@ -14,6 +14,7 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
+#include <cmath>
 #include <iostream>
 #include <sstream>
 
@@ -184,8 +185,8 @@
           spokeLoc = CreateObject<ConstantPositionMobilityModel> ();
           spokeNode->AggregateObject (spokeLoc);
         }
-      Vector spokeVec (hubVec.x + cos (theta*i) * spokeDist,
-                       hubVec.y + sin (theta*i) * spokeDist,
+      Vector spokeVec (hubVec.x + std::cos (theta*i) * spokeDist,
+                       hubVec.y + std::sin (theta*i) * spokeDist,
                        0);
       spokeLoc->SetPosition (spokeVec);
     }