samba 3.28 port compilation gives error about locking unavailable

[Dave]

Hello,
    I'm trying to install samba 3.28 on 6.3. Previously i had installed 
samba on 6.2 without seeing this error.

    LDAP_LIBS = -lldap -llber
    AUTH_LIBS = -lcrypt  -lpam
checking configure summary... ERROR: No locking available. Running Samba 
would be unsafe
configure: error: summary failure. Aborting config
===>  Script "configure" failed unexpectedly.

I believe this is something specific to this system and not a port issue, 
i've done this install in a jailed environment and the compilation worked 
fine. This 6.3 install was done using sysinstall's minimum working 
configuration option. I'm trying to configure samba as a pdc with an ldap 
backend. If anyone has an idea on this locking error i'm open to 
suggestions.
Thanks.
Dave.