I've learned GNU Make
I've also wasted several days writing a makefile for a project consisting of multiple assemblies each being one of a few types. (Shared object, executable, assetlib, beverage)

Useful tool, horrible syntax rules straight from the dawn of parsing. Wish there was something more modern that wasn't a horrorshow.

@FrodoSwaggins I actually really like how it works. The whitespace sensitivity is a bit irritating but the feature set is really convenient and it reads very easily despite the incredibly dense structure and little liberty to make it readable.

@Jilano