Show HN: First real C project. Where to go now?
github.com
github.com
If you want to keep the custom makefile, Makefile is a more common name (but both are correct). For the clean target, you missed the `ma3c` file and the recursive option in rm is not needed. `rm -f *.o ma3c` would be more safe (or paranoid ;) )
I'm not sure what kind of comments were you looking for, but this is a maintainer's perspective.