{self, ...}: {
  flake.overlays.lap = final: prev: {
    lap = final.callPackage ./_derivation.nix {};
  };
  flake.nixosModules.lap-overlay = {
    nixpkgs.overlays = [self.overlays.lap];
  };
  perSystem = {pkgs, ...}: {
    packages.lap = pkgs.callPackage ./_derivation.nix {};
  };
}