anchor.diff:  
   stdenv.mkDerivation rec {
     pname = "rambox-pro";
  -  version = "1.2.2";
  +  version = "1.3.1";
   
     dontBuild = true;
     dontStrip = true;
  
positive.code: 
    meta = with stdenv.lib; {
      description = "Messaging and emailing app that combines common web applications into one";
      homepage = https://rambox.pro;
      license = licenses.unfree;
      maintainers = with maintainers; [ chrisaw ];
      platforms = [ "i686-linux" "x86_64-linux" ];
  
negative.code: 
    src = fetchurl {
      url = "https://github.com/ramboxapp/download/releases/download/v${version}/RamboxPro-${version}-linux-x64.tar.gz";
      sha256 = "1cy4h2yzrpr3gxd16p4323w06i67d82jjlyx737c3ngzw7aahmq1";
    };
  
    installPhase = ''
  