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

Calculating dependencies ... done!
Dependency resolution took 0.83 s (backtrack: 0/20).


!!! All ebuilds that could satisfy "=sys-block/arcconf-4.23.00.27147" have been masked.
!!! One of the following masked packages is required to complete your request:
- sys-block/arcconf-4.23.00.27147::gentoo (masked by: Microsemi license(s))
A copy of the 'Microsemi' license is located at '/Volumes/Disk 1/Repository/portage-git/licenses/Microsemi'.


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