Index: shutil.py
===================================================================
--- shutil.py	(revision xxxxx)
+++ shutil.py	(working copy)
@@ -7,6 +7,7 @@
 import os
 import sys
 import stat
+import exceptions
 from os.path import abspath
 
 __all__ = ["copyfileobj","copyfile","copymode","copystat","copy","copy2",
@@ -15,6 +16,13 @@
 class Error(EnvironmentError):
     pass
 
+# Make sure shutil_WindowsError is defined even if there is no such
+# thing as WindowsError because copytree references it whenever
+# copystat fails, regardless of the OS.
+class NeverThrownException(Exception):
+    pass
+shutil_WindowsError = exceptions.__dict__.get('WindowsError', NeverThrownException)
+
 def copyfileobj(fsrc, fdst, length=16*1024):
     """copy data from file-like object fsrc to file-like object fdst"""
     while 1:
@@ -129,7 +137,7 @@
             errors.extend(err.args[0])
     try:
         copystat(src, dst)
-    except WindowsError:
+    except shutil_WindowsError:
         # can't copy file access times on Windows
         pass
     except OSError, why: