--- a/wutils.py	Mon Sep 19 19:56:58 2011 +0100
+++ b/wutils.py	Tue Sep 20 11:23:59 2011 +0100
@@ -229,5 +229,5 @@
         cwd = Options.cwd_launch
     if visualize:
         execvec.append("--SimulatorImplementationType=ns3::VisualSimulatorImpl")
-    return run_argv([env['PYTHON']] + execvec, env, cwd=cwd)
+    return run_argv([env['PYTHON'][0]] + execvec, env, cwd=cwd)