samba 3.28 on 6.3 produces configure no locking error

[Dave]

Hello,
I am trying to install samba
3.28 on a freebsd 6.3 machine via ports. I've done this before many times,
on this particular machine configure is failing with the error: no locking
is available, running samba would be unsafe. I've googled and have seen this 
error, but no fixes. Any suggestions welcome. If it matters this is on a 
ufs2 filesystem with acls, and softupdates on it. It's also not mounted with 
any special mount options.
    Thanks.
Dave.