final: prev: {
  retropieSetup = final.callPackage ./retropie-setup.nix {};

  joy2keyd = final.python3.pkgs.callPackage ./joy2keyd {};
  joy2key = final.callPackage ./joy2key.nix {};

  runcommand = final.callPackage ./runcommand.nix {};

  emulationstationPatched = final.emulationstation.overrideAttrs (_: previous: {
    patches = [ ./emulationstation.patch ];
  });

  symlinkJoinSubdir =
    args_@{ name
         , paths
         , subdir ? ""
         , preferLocalBuild ? true
         , allowSubstitutes ? false
         , postBuild ? ""
         , ...
         }:
    let
      args = removeAttrs args_ [ "name" "postBuild" ]
        // {
          inherit preferLocalBuild allowSubstitutes;
          passAsFile = [ "paths" ];
        }; # pass the defaults
    in final.runCommand name args
      ''
        mkdir -p $out/${subdir}
        for i in $(cat $pathsPath); do
          ${final.xorg.lndir}/bin/lndir -silent $i $out/${subdir}
        done
        ${postBuild}
      '';

  roms = final.callPackage ./roms {};

  wrapRetroarch' = { retroarch, cores ? [ ], settings ? { } }:
    final.callPackage ./wrap-retroarch.nix { inherit retroarch cores settings; };
}