From: Michael R. Crusoe <crusoe@debian.org>
Subject: Silence cython warning, default to Python 3
--- atropos.orig/setup.py
+++ atropos/setup.py
@@ -116,7 +116,7 @@
             check_cython_version()
             from Cython.Build import cythonize
 
-            self.extensions = cythonize(self.extensions)
+            self.extensions = cythonize(self.extensions, language_level = "3")
         _build_ext.run(self)
 
 
@@ -129,7 +129,7 @@
         from Cython.Build import cythonize
 
         check_cython_version()
-        cythonize(extensions)
+        cythonize(extensions, language_level = "3")
         versioneer_sdist.run(self)
 
 
