setup.py

--- a/setup.py	Fri Jul 22 17:28:05 2016 +0200
+++ b/setup.py	Mon Jul 25 15:10:52 2016 +0200
@@ -318,7 +318,8 @@
         if self.distribution.pure:
             self.distribution.ext_modules = []
         elif self.distribution.cffi:
-            exts = []
+            import setup_mpatch_cffi
+            exts = [setup_mpatch_cffi.ffi.distutils_extension()]
             # cffi modules go here
             if sys.platform == 'darwin':
                 import setup_osutil_cffi