new-host etc # emerge =sys-apps/paludis-0.24.6     
--- Invalid atom in /etc/portage/package.keywords: =sys-apps/paludis
Calculating dependencies /
!!! All ebuilds that could satisfy "=sys-apps/paludis-0.24.6" have been masked.
!!! One of the following masked packages is required to complete your request:
- sys-apps/paludis-0.24.6 (masked by: ~x86 keyword)

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