anchor.diff:  
     configureFlags = [
       "--enable-user-session"
  +    "--enable-xml-docs"
       "--libexecdir=${placeholder ''out''}/libexec"
       "--datadir=/etc"
       "--localstatedir=/var"
  
positive.code:       --replace 'DBUS_DAEMONDIR"/dbus-daemon"' '"/run/current-system/sw/bin/dbus-daemon"'
    '';
  
    outputs = [ "out" "dev" "lib" "doc" ];
  
    nativeBuildInputs = [
      pkgconfig
    ];
  
    propagatedBuildInputs = [
  
negative.code: , libSM ? null
  , x11Support ? (stdenv.isLinux || stdenv.isDarwin)
  , dbus
  , docbook_xml_dtd_44
  , docbook-xsl-nons
  , xmlto
  }:
  
  assert
  