[pmwiki-users] How to locate local wiki local directory?

[JB]

I want to store my htpasswd file in the local wiki local 
directory, not somewhere in the farm directory.  Is there 
a better way to locate it for AuthUser than the line below
in my config.php file?

  $AuthUser['htpasswd'] = "$FarmD/../wayneswiki/local/members.htpasswd";