--- a/setup.py	Tue May 02 21:04:40 2017 +0900
+++ b/setup.py	Tue May 02 21:08:38 2017 +0900
@@ -582,6 +582,7 @@
 
 packages = ['mercurial',
             'mercurial.cext',
+            'mercurial.cffi',
             'mercurial.hgweb',
             'mercurial.httpclient',
             'mercurial.pure',