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