--- a/mercurial/posix.py	Fri Dec 16 21:09:40 2011 +0900
+++ b/mercurial/posix.py	Fri Dec 16 21:09:41 2011 +0900
@@ -164,6 +164,9 @@
     st2 = os.lstat(fpath2)
     return st1.st_dev == st2.st_dev
 
+encodinglower = None
+encodingupper = None
+
 # os.path.normcase is a no-op, which doesn't help us on non-native filesystems
 def normcase(path):
     return path.lower()