diff -Naur google_appengine.orig//google/appengine/tools/dev_appserver.py google_appengine//google/appengine/tools/dev_appserver.py
--- google_appengine.orig//google/appengine/tools/dev_appserver.py	2010-06-23 03:40:09.000000000 +0900
+++ google_appengine//google/appengine/tools/dev_appserver.py	2010-07-10 13:47:14.000000000 +0900
@@ -1395,6 +1395,7 @@
       '_lsprof',
       '_md5',
       '_multibytecodec',
+      '_multiprocessing',
       '_scproxy',
       '_random',
       '_sha',