anchor.diff:        pkgs.stdenv.mkDerivation rec {
           name = "nixui";
           src = nixui;
  -        buildInputs = with pkgs; [ psmisc nettools ];
           shellHook = ''
             ${nixui}/bin/nixui
           '';
  
positive.code:     if action == "env" then
        pkgs.stdenv.mkDerivation rec {
          name = "nixui-env";
          buildInputs = (with pkgs; [ nodejs psmisc nettools ]) ++ [ nodewebkit
            npm2nix ];
          shellHook = ''
            export NODE_PATH="`pwd`/node_modules:$NODE_PATH"
          '';
  
negative.code:   nixui = pkgs.stdenv.mkDerivation rec {
      name = "nixui";
      src = [ { name = "nixui-src"; outPath = ./.; } ];
      buildPhase = "";
      installPhase = ''
        mkdir -p $out/bin
  