--- setup.py.orig	2019-10-17 20:23:50.000000000 -0400
+++ setup.py	2019-10-17 20:24:07.000000000 -0400
@@ -205,10 +205,7 @@
 # During package development we want to use Cython, but the distributed
 # egg shouldn't use Cython.  We use the presence of PKG-INFO to determine
 # which of these is true.
-if os.path.exists('PKG-INFO'):
-    USE_CYTHON = False
-else:
-    USE_CYTHON = True
+USE_CYTHON = True
 
 
 if USE_CYTHON: