core/flake.nix

{
  inputs = { auxlib.url = "github:auxolotl/lib"; };

  outputs = { self, auxlib, ... }:
    let
      inherit (auxlib) lib;
      forAllSystems = self.lib.genAttrs self.lib.systems.flakeExposed;
    in {
      inherit lib;

      auxPackages = forAllSystems (system:
        (let requiredVersion = import ./minver.nix;

        in if !builtins ? nixVersion
        || builtins.compareVersions requiredVersion builtins.nixVersion
        == 1 then
          abort ''
            This version of Nixpkgs requires Nix >= ${requiredVersion}, please upgrade:

            - If you are running NixOS, `nixos-rebuild' can be used to upgrade your system.

            - Alternatively, with Nix > 2.0 `nix upgrade-nix' can be used to imperatively
              upgrade Nix. You may use `nix-env --version' to check which version you have.

            - If you installed Nix using the install script (https://nixos.org/nix/install),
              it is safe to upgrade by running it again:

                  curl -L https://nixos.org/nix/install | sh

            For more information, please see the NixOS release notes at
            https://nixos.org/nixos/manual or locally at
            ${toString ./nixos/doc/manual/release-notes}.

            If you need further help, see https://nixos.org/nixos/support.html
          ''
        else
          import ./pkgs/top-level/default.nix {
            inherit lib;
            localSystem = system;
          }));
    };
}