Change #! line to modern usage
diff --git a/Demo/pdist/rcvs b/Demo/pdist/rcvs
index e1d7aea..f82a27a 100755
--- a/Demo/pdist/rcvs
+++ b/Demo/pdist/rcvs
@@ -1,4 +1,4 @@
-#! /usr/local/bin/python
+#!/usr/bin/env python
 
 import addpack
 addpack.addpack('/home/guido/src/python/Demo/pdist')