install_lib

# File lib/rubygems/commands/setup_command.rb, line 286
  def install_lib(lib_dir)
    libs = { 'RubyGems' => 'lib' }
    libs['Bundler'] = 'bundler/lib' if Gem::USE_BUNDLER_FOR_GEMDEPS
    libs.each do |tool, path|
      say "Installing #{tool}" if @verbose

      lib_files = rb_files_in path
      lib_files.concat(template_files) if tool == 'Bundler'

      pem_files = pem_files_in path

      Dir.chdir path do
        lib_files.each do |lib_file|
          install_file lib_file, lib_dir
        end

        pem_files.each do |pem_file|
          install_file pem_file, lib_dir
        end
      end
    end
  end