--- xulrunner-27.0/mozilla/python/mozbuild/mozbuild/virtualenv.py~	2013-05-11 21:19:23.000000000 +0200
+++ xulrunner-27.0/mozilla/python/mozbuild/mozbuild/virtualenv.py	2013-05-14 22:51:32.136719267 +0200
@@ -71,9 +71,7 @@
     @property
     def virtualenv_script_path(self):
         """Path to virtualenv's own populator script."""
-        return os.path.join(
-            self.topsrcdir, "third_party", "python", "virtualenv", "virtualenv.py"
-        )
+        return '/usr/bin/virtualenv-3'
 
     @property
     def version_info(self):