diff -r 008d37c4d783 -r 3b88a7fa97d8 contrib/import-checker.py
--- a/contrib/import-checker.py	Sat Aug 13 12:08:23 2016 +0900
+++ b/contrib/import-checker.py	Sat Aug 13 12:12:50 2016 +0900
@@ -26,7 +26,6 @@
 
 # Modules that have both Python and C implementations.
 _dualmodules = (
-    'bdiff.py',
     'diffhelpers.py',
     'mpatch.py',
     'parsers.py',