anchor.diff:  
     src = fetchurl {
       url = "mirror://gnome/sources/${pname}/${lib.versions.majorMinor version}/${pname}-${version}.tar.xz";
  -    sha256 = "sha256-RmueAmwfnrO2WWb1MNl3A6ghLar5EXSMFF6cuEPb1v4=";
  +    sha256 = "sha256-acE3tXgik1OTcbzb0VuRzB8PSi9U2b3jszmGB6WIkKI=";
     };
   
     nativeBuildInputs = [
  -    docbook_xml_dtd_43
  -    docbook-xsl-nons
       gobject-introspection
  -    gtk-doc
  -    libxml2
  +    gi-docgen
       meson
       ninja
       pkg-config
  
positive.code:     runHook postCheck
    '';
  
    passthru = {
      updateScript = gnome.updateScript {
        packageName = pname;
  
negative.code:   buildInputs = [
      gdk-pixbuf
      gtk3
    ] ++ lib.optionals enableGlade [
      glade
    ];
  