请问如何emerge transset-df

nainaide

请问如何emerge这个包
x11-misc/transset-df
     Available versions:  *6
     Homepage:            http://forchheimer.se/transset-df/
     Description:         a patched version of xorg's transset

server abc # emerge transset-df
Calculating dependencies \
!!! All ebuilds that could satisfy "x11-misc/transset-df" have been masked.
!!! One of the following masked packages is required to complete your request:
- x11-misc/transset-df-6 (masked by: missing keyword)

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

Kingo

要先emerge x11-misc/transset-df-6吧？