install (Merb::RakeHelper)

    # File lib/merb-core/tasks/merb_rake_helper.rb, line 8
        def self.install(name, options = {})
          defaults = { :cache => false }
          defaults[:install_dir] = ENV['GEM_DIR'] if ENV['GEM_DIR']
          opts = defaults.merge(options)
          dir = if File.directory?(subdir = File.join(Dir.pwd, name))
            subdir
          else
            Dir.pwd
          end
          install_gem_from_source(dir, name, opts)
          ensure_wrapper(opts[:install_dir] || Gem.default_dir, name)
        end