rec {

  mkPkgs = src: let

    normalPkgs = (import src) {};

    config = {
      allowUnfree = true;
      packageOverrides = pkgs: {

        nixgl = let

          src = builtins.fetchTarball {
            name = "nixgl-unstable";
            url = "https://github.com/guibou/nixGL/archive/7165ffbccbd2cf4379b6cd6d2edd1620a427e5ae.tar.gz";
            sha256 = "1wc85xqnq2wb008y9acb29jbfkc242m9697g2b8j6q3yqmfhrks1";
          };

          nixgl = (import src) {
            inherit pkgs;
            enable32bits = false;
          };

        in nixgl.auto.nixGLDefault;

      };
    };

  in pkgsArg: (import src) (
    normalPkgs.lib.attrsets.recursiveUpdate { config = config; } pkgsArg
  );

  stable = mkPkgs (builtins.fetchTarball {
    name = "nixpkgs-2405";
    url = "https://github.com/nixos/nixpkgs/archive/63dacb46bf939521bdc93981b4cbb7ecb58427a0.tar.gz";
    sha256 = "sha256:1lr1h35prqkd1mkmzriwlpvxcb34kmhc9dnr48gkm8hh089hifmx";
  });
}