diff -Naur a/setup.py b/setup.py
--- a/setup.py	2019-01-08 23:06:33.082873069 +0000
+++ b/setup.py	2019-01-08 23:06:47.707165225 +0000
@@ -356,7 +356,7 @@
                 for d in os.environ[k].split(os.path.pathsep):
                     _add_directory(library_dirs, d)
 
-        prefix = sysconfig.get_config_var("prefix")
+        prefix = None
         if prefix:
             _add_directory(library_dirs, os.path.join(prefix, "lib"))
             _add_directory(include_dirs, os.path.join(prefix, "include"))