--- setup.py.orig	2013-08-14 00:49:59.911020760 -0500
+++ setup.py	2013-08-14 00:53:33.014980410 -0500
@@ -111,7 +111,8 @@
         # add standard directories
 
         # standard locations
-        _add_directory(include_dirs, "/usr/include")
+        prefix = sysconfig.get_config_var("prefix")
+        _add_directory(include_dirs, os.path.join(prefix, "include"))
 
         #
         # insert new dirs *before* default libs, to avoid conflicts