root /usr/portage/profiles # emerge -pv =media-video/mplayer-1.0_pre8

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

Calculating dependencies
!!! All ebuilds that could satisfy "=media-video/mplayer-1.0_pre8" have been masked.
!!! One of the following masked packages is required to complete your request:
- media-video/mplayer-1.0_pre8 (masked by: )

For more information, see MASKED PACKAGES section in the emerge man page or
refer to the Gentoo Handbook.