{self, ...}: {
  flake.overlays.follow-hive-nixpkgs = final: prev: {
    follow-hive-nixpkgs = final.callPackage ./_derivation.nix {};
  };

  perSystem = {pkgs, ...}: {
    packages.follow-hive-nixpkgs = pkgs.callPackage ./_derivation.nix {};
    devShells.follow-hive-nixpkgs = import ./_shell.nix {inherit pkgs;};
  };

  flake.nixosModules.follow-hive-nixpkgs-overlay = {
    nixpkgs.overlays = [
      self.overlays.follow-hive-nixpkgs
    ];
  };

  flake.nixosModules.follow-hive-nixpkgs = {pkgs, ...}: {
    imports = [
      self.nixosModules.follow-hive-nixpkgs-overlay
    ];

    environment.systemPackages = [
      pkgs.follow-hive-nixpkgs
    ];
  };
}