Add a modified patch from craigcitro@ to handle namespace sharing.
diff --git a/python/google/__init__.py b/python/google/__init__.py
index de40ea7..5585614 100755
--- a/python/google/__init__.py
+++ b/python/google/__init__.py
@@ -1 +1,4 @@
-__import__('pkg_resources').declare_namespace(__name__)
+try:
+  __import__('pkg_resources').declare_namespace(__name__)
+except ImportError:
+  __path__ = __import__('pkgutil').extend_path(__path__, __name__)