# File lib/multiruby.rb, line 382
  def self.update_rubygems
    url = "http://files.rubyforge.rubyuser.de/rubygems/"
    html = URI.parse(url).read

    versions = html.scan(/href="rubygems-update-(\d+(?:\.\d+)+).gem/).flatten
    latest = versions.sort_by { |s| s.scan(/\d+/).map { |s| s.to_i } }.last

    Multiruby.in_versions_dir do
      File.unlink(*Dir["rubygems*"])
      file = "rubygems-#{latest}.tgz"
      File.open file, 'w' do |f|
        f.write URI.parse(url+file).read
      end
    end

    Multiruby.in_install_dir do
      FileUtils.rm_rf Dir["*"]
    end
  end