# File lib/fog/bin/virtual_box.rb, line 26
    def available?
      availability = if Gem::Specification.respond_to?(:find_all_by_name)
        !Gem::Specification.find_all_by_name('virtualbox').empty? # newest rubygems
      else
        !Gem.source_index.find_name('virtualbox').empty? # legacy
      end
      if availability
        for service in services
          for collection in self.class_for(service).collections
            unless self.respond_to?(collection)
              self.class_eval "def self.\#{collection}\nself[:\#{service}].\#{collection}\nend\n", __FILE__, __LINE__
            end
          end
        end
      end
      availability
    end