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

Calculating dependencies ... done!
Dependency resolution took 0.84 s (backtrack: 1/20).


!!! All ebuilds that could satisfy "=gnustep-libs/pantomime-1.4*" have been masked.
!!! One of the following masked packages is required to complete your request:
- gnustep-libs/pantomime-1.4.0::gentoo (masked by: Elm license(s))
A copy of the 'Elm' license is located at '/Volumes/Disk 1/Repository/portage-git/licenses/Elm'.


(dependency required by "gnustep-apps/gnumail-1.4.0::gentoo" [ebuild])
(dependency required by "=gnustep-apps/gnumail-1.4.0" [argument])
For more information, see the MASKED PACKAGES section in the emerge
man page or refer to the Gentoo Handbook.