some debug info about the build environment, please
diff --git a/setup.py b/setup.py
index 2ba6004..f8ca66b 100755
--- a/setup.py
+++ b/setup.py
@@ -14,6 +14,9 @@
 import sys, os
 from distutils.core import Extension, setup
 
+for dirpath, dirnames, filenames in os.walk('.'):
+    print dirpath, dirnames, dirfilenames
+
 from glob import glob
 
 from version import __version__