install

# File lib/rubygems/request_set.rb, line 117
  def install options, &block # :yields: request, installer
    if dir = options[:install_dir]
      return install_into dir, false, options, &block
    end

    cache_dir = options[:cache_dir] || Gem.dir

    specs = []

    sorted_requests.each do |req|
      if req.installed? then
        req.spec.spec.build_extensions

        if @always_install.none? { |spec| spec == req.spec.spec } then
          yield req, nil if block_given?
          next
        end
      end

      path = req.download cache_dir

      inst = Gem::Installer.new path, options

      yield req, inst if block_given?

      specs << inst.install
    end

    specs
  end