Gentoo-like use-flags


#1

I made two demo implementations of Gentoo-like use-flags (https://github.com/NixOS/nixpkgs/issues/12877) for nixpkgs:

- Undesirable one https://github.com/NixOS/nixpkgs/pull/56109

- The, IMHO, desirable one https://github.com/NixOS/nixpkgs/pull/56110 that needs some more work (and, hence, consensus on merging that work to nixpkgs in the first place).

https://github.com/NixOS/nixpkgs/pull/56110 also has all the technical details and thoughts on the topic.

Any thoughts are welcome here or there.