# File lib/rubygems/doc_manager.rb, line 128
    def uninstall_doc
      raise Gem::FilePermissionError.new(@spec.installation_path) unless
        File.writable? @spec.installation_path

      original_name = [
        @spec.name, @spec.version, @spec.original_platform].join '-'

      doc_dir = File.join @spec.installation_path, 'doc', @spec.full_name
      unless File.directory? doc_dir then
        doc_dir = File.join @spec.installation_path, 'doc', original_name
      end

      FileUtils.rm_rf doc_dir

      ri_dir = File.join @spec.installation_path, 'ri', @spec.full_name

      unless File.directory? ri_dir then
        ri_dir = File.join @spec.installation_path, 'ri', original_name
      end

      FileUtils.rm_rf ri_dir
    end