Wxruby in jruby


I want to write a wxruby app that uses Java classes for doing JMX. It
seems that it should work but it doesn’t seem that I can install the
wxruby gem into jruby’s world. I’m using OS X 10.5 and I’m using
MacPorts to install jruby. When I run gem install, I get:

sudo jruby -S gem install wxruby

JRuby limited openssl loaded. gem install jruby-openssl for full
ERROR: could not find gem wxruby locally or in a repository

But when I run:

jruby -S gem q -r

it lists wxruby as available.

Am I interacting with jruby properly?