{
  description = "java web applet resurrection";

  inputs = {
    nixpkgs.url = "nixpkgs/nixos-22.05";
    old-nixpkgs = {
      flake = false;

      # See https://lazamar.co.uk/nix-versions/?channel=nixpkgs-unstable&package=icedtea-web

      # 1.5.2 - 2015-04-13
      # url = "https://github.com/NixOS/nixpkgs/archive/df31a338dcfbbc1561905eb02224912c82a92fc7.tar.gz";

      # 1.6 - 2015-08-31
      # url = "https://github.com/NixOS/nixpkgs/archive/00abee22bee06fdb57ee67cc514ab387deb186c9.tar.gz";

      # 1.6.1 -	2016-02-08
      url = "https://github.com/NixOS/nixpkgs/archive/dd7e6bd97fc26b72fb6ac9e9d6f9750980fd3f56.tar.gz";
      
      # 1.6.2 -	2018-03-12
      # url = "https://github.com/NixOS/nixpkgs/archive/2c9d2d65266c2c3aca1e4c80215de8bee5295b04.tar.gz";
      
      # 1.7.1 -	2019-06-24
      # url = "https://github.com/NixOS/nixpkgs/archive/4599f2bb9a5a6b1482e72521ead95cb24e0aa819.tar.gz";
    };
  };

  outputs = { self, nixpkgs, old-nixpkgs }: let
    system = "x86_64-linux";
    pkgs = import nixpkgs { inherit system; };
    old-pkgs = import old-nixpkgs { inherit system; };
  in {
    apps.${system} = {
      default = self.apps.${system}.javaws-adjusted-viewer;
      javaws = {
        type = "app";
        program = "${self.packages.${system}.icedtea-web}/bin/javaws";
      };
      javaws-adjusted-viewer = {
        type = "app";
        program = let
          inherit (self.packages.${system}) icedtea-web adjusted-viewer;
          executable = pkgs.writeShellScriptBin "javaws-adjusted-viewer"''
            ${icedtea-web}/bin/javaws --verbose ${adjusted-viewer}/viewer.jnlp
          '';
        in "${executable}/bin/javaws-adjusted-viewer";
      };
    };

    packages.${system} = {
      icedtea-web = old-pkgs.icedtea8_web;
      adjusted-viewer = pkgs.callPackage ./adjust-viewer.nix {
        ip = "localhost";
        https-port = 8000;
        kmport = 5900;
        vport = 5900;

        original-viewer-path = ./viewer.jnlp;
      };
    };

    devShells.${system}.default = pkgs.mkShell {
      packages = with self.packages.${system}; [ icedtea-web ];
    };
  };
}