{
  outputs = { self, nixpkgs, ... }: let
    r24 = { lib, python3Packages }: let
    in python3Packages.buildPythonApplication rec {
      pname = "r24";
      version = "0.1";
      pyproject = true;
      src = ./.;

      propagatedBuildInputs = with python3Packages; [
        setuptools
        django
      ];
    };
    packages = system: pkgs: {
      r24 = pkgs.callPackage r24 {};
    };
  in {
    packages = builtins.mapAttrs packages nixpkgs.legacyPackages;
    defaultPackage = builtins.mapAttrs (_: pkgs: pkgs.r24) self.packages;
  };
}