This package has an All-Rights-Reserved LICENSE, but no MIRROR="mirror bindist".
Nothing in the tree depends on this, so my vote would be to mask this for removal. If people need it they can install it via rubygems instead. @mrueg: you added this initially, what do you think?
IIRC I added this for gitlab, which never made it to the tree because of other issues. So feel free to mask.
# Hans de Graaff <graaff@gentoo.org> (15 Feb 2015) # Masked for removal due to licensing issues, bug 539778 dev-ruby/gemoji