diff -r 1266e98fd04c Tools/scripts/pyvenv
--- a/Tools/scripts/pyvenv	Fri Sep 25 13:05:13 2015 -0700
+++ b/Tools/scripts/pyvenv	Fri Sep 25 13:11:53 2015 -0700
@@ -1,6 +1,12 @@
 #!/usr/bin/env python3
 if __name__ == '__main__':
     import sys
+    import os.path
+
+    executable_name = os.path.basename(sys.executable or 'python3')
+    print('WARNING: the pyvenv script is deprecated in favour of '
+          '`{} -m venv`'.format(executable_name), file=sys.stderr)
+
     rc = 1
     try:
         import venv