--- a/contrib/undumprevlog	Mon Nov 09 09:58:44 2020 -0800
+++ b/contrib/undumprevlog	Fri Nov 06 13:58:59 2020 -0800
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Undump a dump from dumprevlog
 # $ hg init
 # $ undumprevlog < repo.dump