{
  outputs = { nixpkgs, systems, ... }: let
    lib = nixpkgs.lib;
    eachSystem = f: lib.genAttrs (import systems) (system: f { pkgs = nixpkgs.legacyPackages.${system}; });
  in {
    packages = eachSystem (p: {
      default = import ./. p;
    });
    devShells = eachSystem (p: {
      default = import ./. p;
    });
  };
}