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

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

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

  outputs = { self, nixpkgs }: let
    system = "x86_64-linux";
    pkgs = nixpkgs.legacyPackages.${system};
  in {
    packages.${system} = rec {
      icedtea-web = pkgs.icedtea8_web;
      default = icedtea-web;
    };

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