From: Trans <transfire@...>
Date: 2006-10-22T06:54:45+09:00
Subject: Re: How to test if a module/gem is installed

I wrote this extension for that. Not sure how robust it is though.

  module Gem

    def self.active?(gemname)
      @loaded_specs ||= Hash.new
      @loaded_specs.key? gemname
    end

  end

T.