How can I make my Makefiles better?

Question

I\'ve trying to learn the \"best practice\" makefile\'s for a project.

Please review my Makefile file below and suggest changes to enhance it.

The dir layout:

Answer 1

If you expect other people to use your Makefile, always include a help target that prints out a message detailing the various targets that are sensible to call from the command line, and the various environment vars which can be reasonably set to do various things...