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I ran into the same problem, and thought it to be an error of rosbuild because download_checkmd5.py was there but could no longer be found using rospack or roscd. I opened up a ticket on github (https://github.com/ros/ros/issues/17).
One of the answers Thomas provided helped me solve the issue: Using the environment variable $ROS_ROOT to get to the script. The line to download the tarball in my Makefile now looks like this:
$(shell echo $$ROS_ROOT)/core/rosbuild/bin/download_checkmd5.py $(TARBALL_URL) $(TARBALL)
I did not try the second solution he proposed (using one of the rosbuild-macros) -- it sure sounds promising.