How to use/build packages in non-flake nix

[jhollowe]

Thanks for these packages.

I've been trying to test out these packages, but can't figure out how to build any of them.
How can I build/use these packages without flakes and without being on NixOS?

/workspaces $ cd nix-system/
/workspaces/nix-system (master) $ nix-build -A enroot
error: the expression selected by the selection path 'enroot' should be a set but is a function

[markuskowa]

You can use release.nix, which exposes the packages

nix-build release.nix -A enroot

default.nix exposes an overlay. This can be used to combine the package set with nixpkgs.