For example, it seems like .travis.yml uses cmake (for the tests), so this is a cmake project that pops out a library that I should link against (it seems not - cmake is just for tests?)? If I look at a module like cpu that has cpu.h and cpu.c do I just drop those into my project (probably not that simple since they may depend on other modules)?

Maybe something like a default-use case s

Building either kinetic or melodic fails since the robo_cylinder dependency isn't found. This package should be either documented as a third party source dependency or added to a .rosinstall file