I haven't used it for a while (been busy with hardware) but I think that's the story. I also so far have only used it for single-file projects and that's handled by the
PROJECT_NAME = test
line, where "test" is the main .c file.
I too am not a makefile expert, I cleaned up the original, got it to a useable state, and left it at that.
I will be getting back into the software side of things soon though so am happy to work with you to get a simple (and understandable to mortals) makefile up and running.
Rob