PHONY help default etc ...
https://medium.com/aigent/makefiles-for-python-and-beyond-5cf28349bf05
https://antonz.org/makefile-automation/
https://gist.github.com/brutus/2dfd02917a939577a8dd561fb091e872
https://serverfault.com/a/205504
https://devhints.io/makefile
https://tech.davis-hansson.com/p/make/
https://gist.github.com/gmolveau/a6331c21e8973f4a1ea51185096e37b8
