Does not work correctly with dev-ruby/timers-4.x installed. Works with dev-ruby/timers-2.x https://github.com/celluloid/timers/issues/43
Fixed, thanks.
The gemspec for celluloid locks to timers 1.1.x, so I've updated the celluloid ebuild to match that. Ah, and I see now we did not install the correct gemspec. Both not fixed in celluloid-0.15.2-r3.