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

Calculating dependencies ... done!
Dependency resolution took 0.85 s (backtrack: 1/20).


!!! All ebuilds that could satisfy "dev-java/hashcash:1" have been masked.
!!! One of the following masked packages is required to complete your request:
- dev-java/hashcash-1.1::gentoo (masked by: GregoryRubin license(s))
A copy of the 'GregoryRubin' license is located at '/Volumes/Disk 1/Repository/portage-git/licenses/GregoryRubin'.


(dependency required by "net-vpn/i2p-2.13.0::gentoo" [ebuild])
(dependency required by "=net-vpn/i2p-2.13.0" [argument])
For more information, see the MASKED PACKAGES section in the emerge
man page or refer to the Gentoo Handbook.