diff -up tevent-0.9.37/buildtools/bin/waf.envpy tevent-0.9.37/buildtools/bin/waf
--- tevent-0.9.37/buildtools/bin/waf.envpy	2018-07-12 13:54:01.482844881 +0200
+++ tevent-0.9.37/buildtools/bin/waf	2018-07-12 13:54:22.183967196 +0200
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python2
 # encoding: ISO-8859-1
 # Thomas Nagy, 2005-2010