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

Calculating dependencies ... done!
Dependency resolution took 0.86 s (backtrack: 1/20).


!!! All ebuilds that could satisfy "x11-misc/xflux" have been masked.
!!! One of the following masked packages is required to complete your request:
- x11-misc/xflux-20170103-r1::gentoo (masked by: f.lux license(s))
A copy of the 'f.lux' license is located at '/Volumes/Disk 1/Repository/portage-git/licenses/f.lux'.

- x11-misc/xflux-20130927-r2::gentoo (masked by: f.lux license(s))

(dependency required by "x11-misc/xflux-gui-2.0-r1::gentoo" [ebuild])
(dependency required by "=x11-misc/xflux-gui-2.0-r1" [argument])
For more information, see the MASKED PACKAGES section in the emerge
man page or refer to the Gentoo Handbook.