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As ROS and caktin heavily builds on CMake as a build system, you at least need an IDE that supports it. Even though it is stated that Geany can use CMake, I haven't found a way to properly configure it with a few minutes of search. You might have to use some plugins.

This is even more true that ROS also requires a few more quirks to set up, usually. There is a large list of IDEs and how to use them with ROS on the wiki. I suggest you try one of those if you want to compile from source. If you want more fancy stuff like jumping to external (out of your source) function definitions, those instructions might come in handy.

On another note: you tagged your question with Indigo. Indigo is EOL since for almost a year now, I suggest to update to a new one