anchor.diff:  
     mesonFlags = [
       "-Denable_docs=false"  # gtk-doc
  +    "-Dgir=true"
     ];
   
     # preCheck = /* Fontconfig fails to load default config in test */
  
positive.code:     optionals
      optionalString;
  
    channel = "1.40";
    version = "${channel}.14";
  in
  stdenv.mkDerivation rec {
    name = "pango-${version}";
  
negative.code: , cairo
  , fontconfig
  , freetype
  , fribidi
  , glib
  , gobject-introspection
  , harfbuzz_lib
  