extract_files

# File lib/rubygems/installer.rb, line 121
    def extract_files(destination_dir, pattern = '*')
      FileUtils.mkdir_p destination_dir

      spec.files.each do |file|
        file = File.join destination_dir, file
        next if File.exist? file
        FileUtils.mkdir_p File.dirname(file)
        File.open file, 'w' do |fp| fp.puts "# #{file}" end
      end
    end