{
  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/pull/462034/head";
  };

  outputs =
    { self, nixpkgs }:
    let
      forAllSystems =
        function:
        nixpkgs.lib.genAttrs nixpkgs.lib.systems.flakeExposed (
          system: function nixpkgs.legacyPackages.${system}
        );
    in
    {
      legacyPackages = forAllSystems (pkgs: import ./default.nix { inherit pkgs; });

      overlays.default = _: prev: import ./default.nix { pkgs = prev; };
    };
}