No worries. I think Make vs Ninja is a whole another discussion but how it relates to this project is that Ninja has less features than Make (e.g. no globs, etc) which makes it attractive as a simple build graph format.

Nix provides the toolchain and dependency management (like where boost is from), as well as ability to remotely execute it which makes it attractive to scale out large builds like a `-j 999`. Nix also lets you do things like patching boost and then recompiling both boost and the downstreams (incrementally and with early cut-off if using nix-ninja) all in one build graph.

All in all, probably not useful if you're not already needing features from Nix. But if you are, this should speed up your builds by a significant amount.