anchor.diff:  
     nativeBuildInputs = [ pkgconfig ];
     propagatedBuildInputs = [ cairo libsigcxx ];
  -  buildInputs = [ fontconfig freetype ];
  +  buildInputs = [ fontconfig freetype ]
  +  ++ stdenv.lib.optionals stdenv.isDarwin (with darwin.apple_sdk.frameworks; [
  +    ApplicationServices
  +  ]);
   
     doCheck = true;
   
  
positive.code:     homepage = http://cairographics.org/;
  
      license = with licenses; [ lgpl2Plus mpl10 ];
      platforms = platforms.linux;
    };
  }
  
negative.code: { fetchurl, stdenv, pkgconfig, darwin, cairo, xlibsWrapper, fontconfig, freetype, libsigcxx }:
  let
    ver_maj = "1.12";
    ver_min = "0";
  