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 ">=sci-physics/geant-4.11.3:=[opengl,geant3?]" have been masked.
!!! One of the following masked packages is required to complete your request:
- sci-physics/geant-4.11.4.1::gentoo (masked by: geant4 license(s))
A copy of the 'geant4' license is located at '/Volumes/Disk 1/Repository/portage-git/licenses/geant4'.

- sci-physics/geant-4.11.4.0::gentoo (masked by: geant4 license(s))
- sci-physics/geant-4.11.3.2-r2::gentoo (masked by: geant4 license(s))

(dependency required by "sci-physics/geant4_vmc-6.8::gentoo" [ebuild])
(dependency required by "=sci-physics/geant4_vmc-6.8" [argument])
For more information, see the MASKED PACKAGES section in the emerge
man page or refer to the Gentoo Handbook.