anchor.diff:  
     nativeBuildInputs = [ cmake ];
   
  -  buildInputs = [ boost ffmpeg ];
  +  darwinInputs = [
  +    frameworks.Accelerate
  +    frameworks.CoreGraphics
  +    frameworks.CoreVideo
  +    zlib
  +    ];
  +  buildInputs = [ boost ffmpeg ] ++ lib.optional stdenv.isDarwin darwinInputs;
   
     cmakeFlags = [ "-DBUILD_EXAMPLES=ON" "-DBUILD_TOOLS=ON" ];
   
  
positive.code: { stdenv, fetchurl, cmake, boost, ffmpeg }:
  
  stdenv.mkDerivation rec {
    pname = "chromaprint";
    version = "1.5.0";
  
  
negative.code:     description = "AcoustID audio fingerprinting library";
      maintainers = with maintainers; [ ehmry ];
      license = licenses.lgpl21Plus;
      platforms = platforms.unix;
    };
  }
  