Add a parameter to control the number of retries.
diff --git a/Makefile b/Makefile
index ba58f84..62931d8 100644
--- a/Makefile
+++ b/Makefile
@@ -1,10 +1,10 @@
 tests:
 	-cd python2 && python2.4 httplib2test.py
 	-cd python2 && python2.5 httplib2test.py
-	#cd python2 && python2.6 httplib2test.py
-	#cd python2 && python2.6 httplib2test_appengine.py
-	cd python2 && ~/bin/python2.7 httplib2test.py
-	cd python2 && ~/bin/python2.7 httplib2test_appengine.py
+	cd python2 && python2.6 httplib2test.py
+	cd python2 && python2.6 httplib2test_appengine.py
+	cd python2 && python2.7 httplib2test.py
+	cd python2 && python2.7 httplib2test_appengine.py
 	cd python3 && ~/bin/python3.2 httplib2test.py
 
 VERSION = $(shell python setup.py --version)