anchor.diff: -{
  -  alsa-lib,
  -  autoPatchelfHook,
  -  callPackage,
  -  fetchzip,
  -  gnome2,
  -  gtk2,
  -  gtk3,
  -  lib,
  -  mesa,
  -  nss,
  -  stdenv,
  -  udev,
  -  unzip,
  -  wrapGAppsHook,
  -  xorg,
  +{ alsa-lib
  +, autoPatchelfHook
  +, callPackage
  +, fetchzip
  +, gnome2
  +, gtk2
  +, gtk3
  +, lib
  +, mesa
  +, nss
  +, stdenv
  +, udev
  +, unzip
  +, wrapGAppsHook
  +, xorg
   }:
   
   stdenv.mkDerivation rec {
  
positive.code:     description = "Fast, easy and reliable testing for anything that runs in a browser";
      homepage = "https://www.cypress.io";
      license = licenses.mit;
      platforms = ["x86_64-linux"];
      maintainers = with maintainers; [ tweber mmahut ];
    };
  }
  
negative.code:   nativeBuildInputs = [ autoPatchelfHook wrapGAppsHook unzip ];
  
    buildInputs = with xorg; [
      libXScrnSaver
      libXdamage
      libXtst
      libxshmfence
    ] ++ [
      nss
      gtk2
      alsa-lib
      gnome2.GConf
      gtk3
      mesa # for libgbm
    ];
  
  