revdep-rebuild -p
Configuring search environment for revdep-rebuild

Checking reverse dependencies...

Packages containing binaries and libraries broken by a package update
will be emerged.

Collecting system binaries and libraries... using existing /root/.revdep-rebuild.1_files.

Collecting complete LD_LIBRARY_PATH... using existing /root/.revdep-rebuild.2_ldpath.

Checking dynamic linking consistency... using existing /root/.revdep-rebuild.3_rebuild.

Assigning files to ebuilds... using existing /root/.revdep-rebuild.4_ebuilds.

Evaluating package order... using existing /root/.revdep-rebuild.5_order.

All prepared. Starting rebuild...
emerge --oneshot -p =gnome-base/gnome-panel-2.18.3 =gnome-extra/gnome-power-manager-2.18.3 =app-office/gnucash-2.0.5 =gnome-base/gnome-applets-2.18.0-r2 =dev-python/gnome-python-desktop-2.18.0 =app-office/openoffice-2.3.0

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild   R   ] gnome-base/gnome-panel-2.18.3
[ebuild  N    ] app-office/gnucash-2.0.5  USE="nls -chipcard -debug -doc -hbci -ofx -quotes"
[ebuild   R   ] app-office/openoffice-2.3.0
[ebuild   R   ] gnome-extra/gnome-power-manager-2.18.3
[ebuild   R   ] gnome-base/gnome-applets-2.18.0-r2
[ebuild   R   ] dev-python/gnome-python-desktop-2.18.0
Now you can remove -p (or --pretend) from arguments and re-run revdep-rebuild.