--- mozilla-release/configure.in.system-virtualenv	2012-11-20 06:45:51.000000000 +0400
+++ mozilla-release/configure.in	2012-11-22 12:30:08.020356523 +0400
@@ -8698,7 +8698,7 @@ dnl Create a virtualenv where we can ins
 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