arachni_web dies on unitialized Fibre error on mac (snow leopard)

Created by: rsussland

I'm using arachni v0.4 from the experimental branch. I've installed Ruby 1.9.3-p0 via macports and built the gem successfully, but when trying to use the webUI

bash-3.2$ sudo arachni_rpcd & [4] 67517 bash-3.2$ sudo arachni_web Password: /opt/local/lib/ruby1.9/1.9.1/rubygems/custom_require.rb:36:in require': iconv will be deprecated in the future, use String#encode instead. DataObjects::URI.new with arguments is deprecated, use a Hash of URI components (/opt/local/lib/ruby1.9/gems/1.9.1/gems/dm-do-adapter-1.1.0/lib/dm-do-adapter/adapter.rb:231:innew') DataObjects::URI.new with arguments is deprecated, use a Hash of URI components (/opt/local/lib/ruby1.9/gems/1.9.1/gems/dm-do-adapter-1.1.0/lib/dm-do-adapter/adapter.rb:231:in new') DataObjects::URI.new with arguments is deprecated, use a Hash of URI components (/opt/local/lib/ruby1.9/gems/1.9.1/gems/dm-do-adapter-1.1.0/lib/dm-do-adapter/adapter.rb:231:innew') DataObjects::URI.new with arguments is deprecated, use a Hash of URI components (/opt/local/lib/ruby1.9/gems/1.9.1/gems/dm-do-adapter-1.1.0/lib/dm-do-adapter/adapter.rb:231:in new') DataObjects::URI.new with arguments is deprecated, use a Hash of URI components (/opt/local/lib/ruby1.9/gems/1.9.1/gems/dm-do-adapter-1.1.0/lib/dm-do-adapter/adapter.rb:231:innew') == Sinatra/1.3.1 has taken the stage on 4567 for development with backup from Thin

Thin web server (v1.3.1 codename Triple Espresso) Maximum connections set to 1024 Listening on 0.0.0.0:4567, CTRL+C to stop /opt/local/lib/ruby1.9/gems/1.9.1/gems/eventmachine-1.0.0.beta.4/lib/eventmachine.rb:179:in run_machine': uninitialized fiber (FiberError) from /opt/local/lib/ruby1.9/gems/1.9.1/gems/eventmachine-1.0.0.beta.4/lib/eventmachine.rb:179:inrun' from /opt/local/lib/ruby1.9/gems/1.9.1/gems/arachni-0.4/bin/arachni_web:52:in <top (required)>' from /opt/local/bin/arachni_web:19:inload' from /opt/local/bin/arachni_web:19:in `' bash-3.2$

This issue doesn't appear when running arachni on my ubuntu VM.