Include ez_setup.py
diff --git a/setup.py b/setup.py
index 9516b2d..f5cbe34 100755
--- a/setup.py
+++ b/setup.py
@@ -1,5 +1,9 @@
 #!/usr/bin/env python
 
+# Ensure that setuptools are installed.
+import ez_setup
+ez_setup.use_setuptools()
+
 from setuptools import setup
 
 import rsa