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It seems like the tutorial is a bit out of date for the Groovy release. If using a catkin workspace, and catkin_make to build, then the C++ message definition should be in ~/Dropbox/RoboticsResearch/Bablumer/trunk/catkin_ws/devel/include/beginner_tutorials, and the Python message definition should be exactly where you found it. This isn't really in inconvenience thanks to the internal workings of catkin_make, and the setup.bash files that are provided in your workspace. If you #include the C++ file in a piece of source code, as long as the package.xml and CMakeLists.txt files are correct, then catkin will know how to find that file. The same is true for importing modules in Python.