--- comm-beta/mozilla/configure.in.system-python-virtualenv	2012-07-23 00:44:57.425071929 +0200
+++ comm-beta/mozilla/configure.in	2012-07-23 01:30:58.838726848 +0200
@@ -8698,7 +8698,7 @@
 AC_MSG_RESULT([Creating Python virtualenv])
 rm -rf _virtualenv
 mkdir -p _virtualenv
-MACOSX_DEPLOYMENT_TARGET= PYTHONDONTWRITEBYTECODE= $PYTHON $_topsrcdir/python/virtualenv/virtualenv.py --system-site-packages ./_virtualenv
+MACOSX_DEPLOYMENT_TARGET= PYTHONDONTWRITEBYTECODE= virtualenv --system-site-packages ./_virtualenv
 case "$host_os" in
 mingw*)
     PYTHON=$MOZ_BUILD_ROOT/_virtualenv/Scripts/python.exe