# File lib/rubygems/commands/setup_command.rb, line 160
  def install_sources
    say "Installing sources"

    $: << "lib"
   require 'rubygems'
   require 'rubygems/builder'
   require 'rubygems/installer'
   require 'rubygems/config_file'

    Dir.chdir("pkgs/sources") do
        load "sources.gemspec"
        spec = Gem.sources_spec
        gem_file = Gem::Builder.new(spec).build
        Gem::Installer.new(gem_file).install
    end
  end