anchor.diff:      cairo
       fontconfig
       freetype
  +    fribidi
       glib
       gobject-introspection
       harfbuzz_lib
  
positive.code: 
    mesonFlags = [
      "-Denable_docs=false"  # gtk-doc
    ];
  
    # preCheck = /* Fontconfig fails to load default config in test */
  
negative.code:     optionals
      optionalString;
  
    channel = "1.42";
    version = "${channel}.0";
  in
  stdenv.mkDerivation rec {
    name = "pango-${version}";
  