Apache匿名认证配置，Anonymous_Authoritative错误？狂郁闷！

cupid

部分配置代码如下：

<Directory "/usr/local/apache2/htdocs/xxx">

       AuthName "Haha,Welcome anonymous guest"
       AuthType Basic
       Anonymous_Authoritative on
       require valid-user
       Anonymous guest www
       Anonymous_MustGiveEmail on
       Anonymous_logemail on
       Anonymous_VerifyEmail on

</Directory>

当我启动apache的时候，提示错误如下：
[root@localhost apache2]# bin/httpd -k restart
Syntax error on line 414 of /usr/local/apache2/conf/httpd.conf:
Invalid command 'Anonymous_Authoritative', perhaps mis-spelled or defined by a module not included in the server configuration

真是奇怪啊，我查了apache手册，Anonymous_Authoritative是这么写的啊？难道错了吗？
我把这句话注释掉就可以了啊？