anybody else having trouble with tng cvs, configure, and locking?

[Gregory Leblanc]

It's entirely possible that I've fouled something up on my machine when I
did a rebuild, but I've done two more re-installs of RH6.1 since then, and
can't figure it out.  I did a checkout of samba tng this morning, and when I
run configure --prefix=/opt/samba, it zips (well, ponders) through a zillion
checks, but pukes on the check for locking.  To be more specific 
'checking configure summary
ERROR: No locking available. Running Samba would be unsafe
configure: error: summary failure. Aborting config'

Seems to me that I'm probably broken, but how?  Thanks,
	Greg