Add #! line.
diff --git a/Lib/base64.py b/Lib/base64.py
index c5a7ca7..c8363fd 100755
--- a/Lib/base64.py
+++ b/Lib/base64.py
@@ -1,3 +1,5 @@
+#! /usr/bin/env python
+
 # Conversions to/from base64 transport encoding as per RFC-MIME (Dec 1991
 # version).