undefined subroutine: get_server_description, get_server_banner

[Jeff Armstrong <suppressed>]

Folks,

<http://perl.apache.org/docs/2.0/api/Apache2/ServerUtil.html#C_get_server_description_> 
indicates that I should be able to:
  $description  = Apache2::ServerUtil::get_server_description();

however, I find that
  Apache2::ServerUtil::get_server_description();
  Apache2::ServerUtil::get_server_banner();

warn => Undefined subroutine

and
  Apache2::ServerUtil->user_id;
  Apache2::ServerUtil->group_id;

warn => Can't locate object method

Are the docs incorrect, or am I doing the wrong thing?

----
Other subs work ok: get_server_built get_server_version server_root

Debian stable (etch)
 Apache/2.2.3
 mod_ssl/2.2.3
 OpenSSL/0.9.8c
 mod_apreq2-20051231/2.6.0
 mod_perl/2.0.2
 Perl/v5.8.8


Many thanks,

Jeff