nixpkgs.config = {
    allowUnfree = true;
    packageOverrides = pkgs: {
        docker =   pkgs.docker.dockerGen rec {
            version = "18.06.1-ce";
            rev = "a18523ea63537a12d0063bd1c7d4b344c3ae5aa2"; # git commit
            sha256 = "04pqararnlzi0lyr78rfqdaqfzp2y65z54rdjiqlfngisz264460";
            runcRev = "69663f0bd4b60df09991c08812a60108003fa340";
            runcSha256 = "1l37r97l3ra4ph069w190d05r0a43s76nn9jvvlkbwrip1cp6gyq";
            containerdRev = "468a545b9edcd5932818eb9de8e72413e616e86e";
            containerdSha256 = "1rp015cm5fw9kfarcmfhfkr1sh0iz7kvqls6f8nfhwrrz5armd5v";
            tiniRev = "fec3683b971d9c3ef73f284f176672c44b448662";
            tiniSha256 = "1h20i3wwlbd8x4jr2gz68hgklh0lb0jj7y5xk1wvr8y58fip1rdn";
        };
    };

    chromium.enableWideVine = true;
  };