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