# File lib/chef/knife.rb, line 156
    def load_late_dependency(dep, gem_name = nil)
      begin
        require dep
      rescue LoadError
        gem_name ||= dep.gsub('/', '-')
        Chef::Log.fatal "#{gem_name} is not installed. run \"gem install #{gem_name}\" to install it."
        exit 1
      end
    end