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-firmware/atmel-firmware-1.3-r3" have been masked.
!!! One of the following masked packages is required to complete your request:
- sys-firmware/atmel-firmware-1.3-r3::gentoo (masked by: Atmel license(s))
A copy of the 'Atmel' license is located at '/Volumes/Disk 1/Repository/portage-git/licenses/Atmel'.


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