{
  releaseName ? "dev",
  buildNumber ? "1",

  buildSystem ? builtins.currentSystem,
  pkgsNix ? (import ./nix/pkgs.nix),
  supportedSystems ? pkgsNix.supportedSystems,
}: let

  pkgs = pkgsNix.default { inherit buildSystem; };

  mkRelease = hostSystem: let

    build = ((import ./default.nix) {
      inherit buildSystem hostSystem releaseName buildNumber;
    }).build;

  in pkgs.stdenv.mkDerivation {
    name = "isle-release-${hostSystem}";
    inherit releaseName buildNumber hostSystem;

    appImage = build.appImage;
    archPkg = build.archPkg;
    debPkg = build.debPkg;

    builder = builtins.toFile "build.sh" ''
      source $stdenv/setup

      mkdir -p "$out"/
      cp "$appImage"/bin/isle "$out"/isle-$releaseName-$buildNumber-$hostSystem.AppImage
      cp "$archPkg"/* "$out"/
      cp "$debPkg"/* "$out"/
    '';
  };

  releases = builtins.map mkRelease supportedSystems;

in

  pkgs.stdenv.mkDerivation {
    name = "isle-release-${releaseName}";
    inherit releases;

    nativeBuildInputs = [ pkgs.coreutils ];

    builder = builtins.toFile "build.sh" ''
      source $stdenv/setup

      mkdir -p "$out"
      for p in $releases; do
        cp "$p"/* "$out"/
      done

      (cd "$out" && sha256sum * > sha256.txt)
    '';
  }