# File lib/pry/rubygem.rb, line 59
      def install(name)
        gemrc_opts = Gem.configuration['gem'].split(' ')
        destination = if gemrc_opts.include?('--user-install')
                        Gem.user_dir
                      elsif File.writable?(Gem.dir)
                        Gem.dir
                      else
                        Gem.user_dir
                      end
        installer = Gem::DependencyInstaller.new(:install_dir => destination)
        installer.install(name)
      rescue Errno::EACCES
        raise CommandError,
          "Insufficient permissions to install #{ Pry::Helpers::Text.green(name) }."
      rescue Gem::GemNotFoundException
        raise CommandError,
          "Gem #{ Pry::Helpers::Text.green(name) } not found. Aborting installation."
      else
        Gem.refresh
      end