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 =net-im/gaim-2.0.0_beta3-r2 =media-video/vlc-0.8.4a-r1 

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

Calculating dependencies... done!
[ebuild   R   ] net-im/gaim-2.0.0_beta3-r2  
[ebuild     UD] media-video/vlc-0.8.4a-r1 [0.8.5-r5] USE="aac%* -ffmpeg% -joystick%" 
Now you can remove -p (or --pretend) from arguments and re-run revdep-rebuild.
localhost ~ #