--- a/tests/printenv.py	Fri Jul 03 18:10:58 2015 +0100
+++ b/tests/printenv.py	Sat Jul 18 17:32:38 2015 -0500
@@ -1,3 +1,5 @@
+#!/usr/bin/env python
+#
 # simple script to be used in hooks
 #
 # put something like this in the repo .hg/hgrc: