I try to append unionfs package to livecd-stage1-minimal.spec ( from 2006.0)
, build for x86,  but got error that
it is masked by ~x86 keyword

I checked the unionfs ebuild files, the KEYWORD variable is ""~x86 ~amd64
~ppc", I append "sys-fs/unionfs ~x86"
to /etc/portage/packages.keywords, it doesn't work.

so, what can I do?