Undefined method `register' for Polyglot:Module

Getting this error. I have the treetop, polyglot, and rspec libraries
in the load_path (not installed as a gem). Any ideas? What defines
the register method?

/home/jvandyk/dev/web/wpn_rails/…/…/rcommon/lib/test/treetop/lib/treetop.rb:16:
undefined method register' for Polyglot:Module (NoMethodError) from /home/jvandyk/dev/rcommon/lib/test/cucumber/bin/../lib/cucumber/parser/treetop_ext.rb:2:inrequire’
from
/home/jvandyk/dev/rcommon/lib/test/cucumber/bin/…/lib/cucumber/parser/treetop_ext.rb:2
from
/home/jvandyk/dev/rcommon/lib/test/cucumber/bin/…/lib/cucumber/parser.rb:4:in
require' from /home/jvandyk/dev/rcommon/lib/test/cucumber/bin/../lib/cucumber/parser.rb:4 from /home/jvandyk/dev/rcommon/lib/test/cucumber/bin/../lib/cucumber.rb:6:inrequire’
from
/home/jvandyk/dev/rcommon/lib/test/cucumber/bin/…/lib/cucumber.rb:6

Oh, hm. Looks like there’s a lot of projects with the name ‘polyglot’.
Hm.