anchor.diff:    buildInputs = [
       zimg libass
       (python3.withPackages (ps: with ps; [ sphinx cython ]))
  -  ] ++ optionals stdenv.isDarwin [ libiconv ApplicationServices ];
  +  ] ++ lib.optionals stdenv.isDarwin [ libiconv ApplicationServices ];
   
     enableParallelBuilding = true;
   
  
positive.code:     platforms   = platforms.x86_64;
      maintainers = with maintainers; [ rnhmjoj sbruder tadeokondrak ];
    };
  
  }
  
negative.code: , zimg, libass, python3, libiconv
  , ApplicationServices
  }:
  
  stdenv.mkDerivation rec {
    pname = "vapoursynth";
  