anchor.diff:      python3
       sassc
       setupHooks
  +  ] ++ optionals withGtkDoc [
  +    docbook_xml_dtd_43
  +    docbook_xsl
  +    gtk-doc
     ];
   
     buildInputs = [
  
positive.code:   '';
  
    nativeBuildInputs = [
      docbook_xml_dtd_43
      docbook_xsl
      gettext
      gtk-doc
      gobject-introspection
      makeWrapper
      meson
  
negative.code:   separateDebugInfo = stdenv.isLinux;
  
    mesonFlags = [
      "-Dgtk_doc=${boolToString withGtkDoc}"
      "-Dtests=false"
    ];
  
  