comp.unix.bsd.freebsd is not widely propagated, so you won't
necessarily get much help here (in comp.unix.bsd.freebsd).
See http://www.freebsd.org/support.html for better ideas...
[followups redirected accordingly]
"Michael J. Pelletier" <michael_j_pellet...@hotmail.com> writes:
There's something in ports:
 (be-well) ports> make search key=ldap|grep -i pam
Info: A pam module for authenticating with LDAP
 (be-well) ports>
Looks like that might do it.