Which source variant contains ros_control?

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The robot variant doesn't include ros_control however:

You can download the zip for ros_control from git and include the extracted ros_control-hydro-devel folder with your other source folders in ~/ws_catkin/src during the install. Catkin will pick it up during make call.

./src/catkin/bin/catkin_make_isolated --install

Otherwise outside of installation, see the catkin Tutorial on building and using catkin packages in a workspace.