anchor.diff:  , meson
   , pkg-config
   , ninja
  -, wayland
  +, wayland-scanner
   , expat
   , libxml2
   , withLibraries ? stdenv.isLinux
  
positive.code:     docbook_xml_dtd_42
    ];
  
    meta = with lib; {
      description = "Core Wayland window system code and protocol";
      longDescription = ''
  
negative.code:     pkg-config
      ninja
    ] ++ lib.optionals isCross [
      wayland-scanner
    ] ++ lib.optionals withDocumentation [
      (graphviz-nox.override { pango = null; }) # To avoid an infinite recursion
      doxygen
  