What's matter?

Hemingway

HappyStation azureus # emerge -uDv world --usepkg --pretend

These are the packages that I would merge, in order:

Calculating world dependencies |
!!! All ebuilds that could satisfy ">=mail-client/evolution-2" have been masked.!!! One of the following masked packages is required to complete your request:
- mail-client/evolution-2.0.2 (masked by: package.mask)

For more information, see MASKED PACKAGES section in the emerge man page or
section 2.2 "Software Availability" in the Gentoo Handbook.
!!!    (dependency required by "gnome-base/gnome-2.8.0-r1" [ebuild])


!!! Problem with ebuild gnome-base/gnome-2.8.0-r1
!!! Possibly a DEPEND/*DEPEND problem.

!!! Depgraph creation failed.

I don't know what I did something wrong.
And I want to know how to change my locale because I want to use scim input method.
It always is POSIX.
I changed it in .xinitrc, but no effect.