These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 0.89 s (backtrack: 0/20).


!!! All ebuilds that could satisfy "=app-benchmarks/cpuburn-1.4a-r5" have been masked.
!!! One of the following masked packages is required to complete your request:
- app-benchmarks/cpuburn-1.4a-r5::gentoo (masked by: package.mask)
/Volumes/Disk 1/Repository/portage-git/profiles/arch/amd64/no-multilib/package.mask:
# AMD64 Team <amd64@gentoo.org>
# Mask packages that rely on amd64 multilib


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