anchor.diff:  
     configureFlags = [
       "--enable-iconv"
  -    #"--enable-libxml2"
       "--disable-docs"
       # This is what you get when loading fontconfig's config fails
       # for any reason.
  
positive.code:   buildInputs = [
      expat
      freetype
    ];
  
    patches = [
  
negative.code: 
  let
    # bump whenever fontconfig breaks compatibility with older configurations
    configVersion = "2.13";
  in
  stdenv.mkDerivation rec {
    name = "fontconfig-2.13.0";
  
    src = fetchurl {
      urls = [
        "https://www.freedesktop.org/software/fontconfig/release/${name}.tar.bz2"
        "http://fontconfig.org/release/${name}.tar.bz2"
      ];
      sha256 = "91dde8492155b7f34bb95079e79be92f1df353fcc682c19be90762fd3e12eeb9";
    };
  
    nativeBuildInputs = [
  