anchor.diff:  , meson
   , ninja
   , pkg-config
  -, gtk-doc
  +, gi-docgen
   , docbook-xsl-nons
   , gettext
   , libxml2
  
positive.code:     meson
      ninja
      pkg-config
      gtk-doc
      docbook-xsl-nons
      wrapGAppsHook4
    ];
  
negative.code:     )
    '';
  
    postFixup = ''
      # Cannot be in postInstall, otherwise _multioutDocs hook in preFixup will move right back.
      moveToOutput "share/doc" "$devdoc"
    '';
  
    passthru = {
      updateScript = gnome.updateScript {
        packageName = pname;
  