diff -r a9c71d578a1c -r 008d37c4d783 contrib/import-checker.py
--- a/contrib/import-checker.py	Fri Aug 12 11:35:17 2016 +0900
+++ b/contrib/import-checker.py	Sat Aug 13 12:08:23 2016 +0900
@@ -26,7 +26,6 @@
 
 # Modules that have both Python and C implementations.
 _dualmodules = (
-    'base85.py',
     'bdiff.py',
     'diffhelpers.py',
     'mpatch.py',