mod_perl PerlAccessHandler/PerlAuthenHandler question

I'm a verteran CGIer but a new mod-perl user.
I have got the mod-perl running fine for the content handling. But when I
try to step in to other stages like Authentication, and have trouble in
setting
PerlAccessHandler
PerlAuthenHandler
etc.

If I put
###======================
<Location /mpl/hello>
  SetHandler perl-script
  PerlHandler Apache::Hello
</Location>

###======================
in the perl.conf file, it's ok. I got the expected from the browser. But
when I changed above to

###======================
PerlModule Apache::AuthAnon
<Location /mpl/hello>
  AuthName Anonymous
  AuthType Basic
  PerlAuthenHandler Apache::AuthAnon
  require valid-user

  PerlSetVar Anonymous anonymous|anybody

  SetHandler perl-script
  PerlHandler Apache::Hello
</Location>

###======================

and try to restart the server, I got
Syntax error on line 9 of /usr/local/apache/conf/perl.conf:
Invalid command 'PerlAuthenHandler', perhaps mis-spelled or defined by a
module not included in the server configuration


When I set up .htaccess in a directory "test" under DocumentRoot,
###======================
PerlAccessHandler Apache::GateKeeper
PerlSetVar Gate closed

###======================
and try to access this directory, the server gives the "Internal Error":
/usr/local/apache/htdocs/test/.htaccess: Invalid command
'PerlAccessHandler', perhaps mis-spelled or defined by a module not included
in the server configuration

I can add "use Apache::GateKeeper ();" in the startup.pl and start the
server without problem, so the module itself should be in the proper path
for tyhe server to load.

Any help on this will be apprieciated.

Harry
GreatLodge.com