anchor.diff:      libxcb
       libxext
       libxrender
  +    xextproto
  +    xproto
     ];
   
     patches = [
  
positive.code:     optionalString;
  in
  stdenv.mkDerivation rec {
    name = "cairo-1.14.10";
  
    src = fetchurl {
      url = "https://cairographics.org/releases/${name}.tar.xz";
      multihash = "QmceAfwie7MyRPHeezGiTA7aUtMVrMKdT6v7YVq8yPavj7";
      hashOutput = false;
      sha256 = "7e87878658f2c9951a14fc64114d4958c0e65ac47530b8ac3078b2ce41b66a09";
    };
  
    nativeBuildInputs = [
  
negative.code:     "--disable-trace"
      "--enable-interpreter"
      "--disable-symbol-lookup"
      "--${boolWt opengl-dummy.glx}-x"
      #(wtFlag "skia" true "yes")
      #(wtFlag "skia-build-type" true "Release")
  