{
  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";

  outputs = { self, nixpkgs }:
  let
    system = "x86_64-linux";
    pkgs = nixpkgs.legacyPackages.${system};
    scope = pkgs.lib.makeScope pkgs.newScope (final: {
      pigeon-toolchain = pkgs.buildEnv {
        name = "pigeon-toolchain";
        paths = with pkgs; [ bash coreutils gcc gnumake util-linux ];
      };
      pigeon-init     = final.callPackage ./init.nix { };
      pigeon-run      = final.callPackage ./run.nix { };
      pigeon-rootfs   = final.callPackage ./rootfs.nix { };
      pigeon-kernel   = final.callPackage ./kernel.nix { };
      pigeon-vmconfig = final.callPackage ./vmconfig.nix { };
      pigeon-vm       = final.callPackage ./vm.nix { };
      pigeon-hooks    = final.callPackage ./hooks.nix { };
      pigeon-webhook  = final.callPackage ./webhook.nix { };
    });
  in {
    packages.${system} = {
      inherit (scope)
        pigeon-toolchain
        pigeon-init pigeon-run pigeon-rootfs pigeon-kernel pigeon-vmconfig pigeon-vm
        pigeon-hooks pigeon-webhook;
    };
  };
}