Unrelated to this topic, I invite you take a look at my project which a tool purpose-built to be a better version of what your makefile became:
Run: Task runner that helps you easily manage and invoke small scripts and wrappers
https://github.com/TekWizely/run
Defining commands feels like make, but comes with a bunch of extras targeted at the needs of a task-runner.
I hope you'll check it out!