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.