anchor.diff:  
     nativeBuildInputs = [
       appstream
  -    docbook-xsl-nons
  -    docbook_xml_dtd_43
       gettext
       gobject-introspection
  -    gtk-doc
  +    gi-docgen
       itstool
       meson
       ninja
  
positive.code: , pantheon
  , python3
  , texlive
  , t1lib
  , gst_all_1
  , gtk-doc
  , docbook-xsl-nons
  , docbook_xml_dtd_43
  , supportMultimedia ? true # PDF multimedia
  , libgxps
  , supportXPS ? true # Open XML Paper Specification via libgxps
  
negative.code:     gappsWrapperArgs+=(--prefix XDG_DATA_DIRS : "${shared-mime-info}/share")
    '';
  
    postFixup = ''
      # Cannot be in postInstall, otherwise _multioutDocs hook in preFixup will move right back.
      moveToOutput "share/doc" "$devdoc"
    '';
  
    passthru = {
      updateScript = gnome.updateScript {
        packageName = pname;
  