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

Calculating dependencies ... done!
Dependency resolution took 1.40 s (backtrack: 3/20).


!!! All ebuilds that could satisfy "sci-libs/inchi" have been masked.
!!! One of the following masked packages is required to complete your request:
- sci-libs/inchi-1.07.5::gentoo (masked by: IUPAC-InChi license(s))
A copy of the 'IUPAC-InChi' license is located at '/Volumes/Disk 1/Repository/portage-git/licenses/IUPAC-InChi'.

- sci-libs/inchi-1.06-r1::gentoo (masked by: IUPAC-InChi license(s))

(dependency required by "sci-chemistry/openbabel-3.2.1::gentoo[inchi]" [ebuild])
(dependency required by "sci-chemistry/gnome-chemistry-utils-0.14.17_p6-r4::gentoo" [ebuild])
(dependency required by "=sci-chemistry/gnome-chemistry-utils-0.14.17_p6-r4" [argument])
For more information, see the MASKED PACKAGES section in the emerge
man page or refer to the Gentoo Handbook.