diff -Nru python-virtualenv-1.4.9/debian/changelog python-virtualenv-1.4.9/debian/changelog
--- python-virtualenv-1.4.9/debian/changelog	2010-08-22 09:55:50.000000000 -0400
+++ python-virtualenv-1.4.9/debian/changelog	2010-11-24 18:07:00.000000000 -0500
@@ -1,3 +1,12 @@
+python-virtualenv (1.4.9-3ubuntu1) natty; urgency=low
+
+  * Add weakrefset to REQUIRED_MODULES.  Backports unreleased upstream fix
+    for Python 2.7 compatibility.
+    http://bitbucket.org/ianb/virtualenv/issue/63/now-python27-requires-_weakrefset
+    (LP: #662611)
+
+ -- Barry Warsaw <barry@ubuntu.com>  Wed, 24 Nov 2010 18:05:21 -0500
+
 python-virtualenv (1.4.9-3) unstable; urgency=low
 
   * Team upload.
diff -Nru python-virtualenv-1.4.9/debian/control python-virtualenv-1.4.9/debian/control
--- python-virtualenv-1.4.9/debian/control	2010-08-21 18:05:11.000000000 -0400
+++ python-virtualenv-1.4.9/debian/control	2010-11-24 18:08:06.000000000 -0500
@@ -1,7 +1,8 @@
 Source: python-virtualenv
 Section: python
 Priority: optional
-Maintainer: Debian Python Modules Team <python-modules-team@lists.alioth.debian.org>
+Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>
+XSBC-Original-Maintainer: Debian Python Modules Team <python-modules-team@lists.alioth.debian.org>
 Uploaders: Carl Chenet <chaica@ohmytux.com>, Jeff Licquia <licquia@debian.org>
 Homepage: http://pypi.python.org/pypi/virtualenv
 Vcs-Svn: svn://svn.debian.org/svn/python-modules/packages/python-virtualenv/trunk/
diff -Nru python-virtualenv-1.4.9/debian/patches/series python-virtualenv-1.4.9/debian/patches/series
--- python-virtualenv-1.4.9/debian/patches/series	2010-08-21 18:11:09.000000000 -0400
+++ python-virtualenv-1.4.9/debian/patches/series	2010-11-24 17:59:59.000000000 -0500
@@ -1,2 +1,3 @@
 look_for_external_files.patch
 add_distribute.patch
+weakrefset-required.patch
diff -Nru python-virtualenv-1.4.9/debian/patches/weakrefset-required.patch python-virtualenv-1.4.9/debian/patches/weakrefset-required.patch
--- python-virtualenv-1.4.9/debian/patches/weakrefset-required.patch	1969-12-31 19:00:00.000000000 -0500
+++ python-virtualenv-1.4.9/debian/patches/weakrefset-required.patch	2010-11-24 18:01:58.000000000 -0500
@@ -0,0 +1,11 @@
+--- a/virtualenv.py
++++ b/virtualenv.py
+@@ -37,6 +37,8 @@
+                     're', 'sre', 'sre_parse', 'sre_constants', 'sre_compile',
+                     'lib-dynload', 'config', 'zlib']
+ 
++if sys.version_info[:2] >= (2, 7):
++    REQUIRED_MODULES.extend(['_weakrefset'])
+ if sys.version_info[:2] >= (2, 6):
+     REQUIRED_MODULES.extend(['warnings', 'linecache', '_abcoll', 'abc'])
+ if sys.version_info[:2] <= (2, 3):