">=media-libs/libsdl-2.0.0_pre6964:2[abi_x86_32,multilib_abi_amd64?,multilib_abi_x86?]" have been masked.
!!! One of the following masked packages is required to complete your request:
- media-libs/libsdl-2.0.0_pre9999::steam-overlay (masked by: missing keyword)
- media-libs/libsdl-2.0.0_pre7250-r1::steam-overlay (masked by: missing keyword)
- media-libs/libsdl-2.0.0_pre7250::steam-overlay (masked by: missing keyword)

(dependency required by "games-util/steam-client-meta-0-r20130514::steam-overlay" [ebuild])
(dependency required by "@selected" [set])
(dependency required by "@world" [argument])
For more information, see the MASKED PACKAGES section in the emerge
man page or refer to the Gentoo Handbook.