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You can run Hydro code in Indigo by cloning the repository to an Ubuntu 14.04 based system that also has ROS Indigo sourced. You can then make a catkin_workspace and put the code in that workspace to build it. If it builds, great. If not, you'll have to fight with it until it builds. Once it builds however, you will be able to use it alongisde your existing ROS system as long as you have that workspace sourced in whatever terminal you're using it with. I suggest adding it to your ~/.bashrc if it will be a continuing occurrence.