升级gnome 2.12后，时钟没了。我该怎么找回来？

afire

gnome-base/nautilus
gnome-base/gnome-vfs
gnome-base/eel
gnome-base/gnome-menus
x11-wm/metacity
app-admin/gnome-system-tools
app-admin/system-tools-backends
gnome-base/gnome-panel
x11-libs/gtk+
dev-libs/glib
x11-libs/pango
x11-libs/cairo
gnome-base/gnome-desktop
gnome-base/gnome-applets
gnome-base/libgtop
sys-apps/hal
sys-apps/dbus
gnome-base/control-center
gnome-extra/evolution-data-server
app-text/gnome-doc-utils
app-editors/gedit
app-arch/file-roller

gentoo用户 只升级 了以上组件。