# emerge -p --complete-graph media-video/mplayer

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

Calculating dependencies... done!
[ebuild   R   ] media-video/mplayer-1.0_rc2_p20090731  USE="-jack*"
# emerge -DNp world

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

Calculating dependencies... done!
# emerge -C media-video/mplayer
 media-video/mplayer
    selected: 1.0_rc2_p20090731
   protected: none
     omitted: none

>>> 'Selected' packages are slated for removal.
>>> 'Protected' and 'omitted' packages will not be removed.

>>> Waiting 5 seconds before starting...
>>> (Control-C to abort)...
>>> Unmerging in: 5 4 3 2 1
>>> Unmerging media-video/mplayer-1.0_rc2_p20090731...

 * GNU info directory index is up-to-date.
# emerge -DNp world

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

Calculating dependencies  ... done!