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

  outputs =
    { nixpkgs, ... }:
    let
      systems = [ "aarch64-linux" "x86_64-linux" ];
      forAllSystems =
        function:
        nixpkgs.lib.genAttrs systems (
          system: function nixpkgs.legacyPackages.${system} system
        );
    in
    {
      packages = forAllSystems (pkgs: system: rec {
        default = backgrounds;
        backgrounds = derivation
          {
            inherit system;
            inherit (pkgs) coreutils;
            name = "backgrounds";
            builder = "${pkgs.bash}/bin/bash";
            args = [ ./builder.sh ];
            src = ./.;
          };
      });
    };
}