samba - Oct 2006 - FreeBSD 6.1 ACL support

Hello,

I have FreeBSD 6.1 and I know I have installed the development libraries for
ACL support.  However, the samba configure script does not seem to be able
to find the acl.h.  In fact, I even explicity enable acl support with
./configure --enable-acl-support and still no luck.  Has anyone else
experienced this and if so, what was done to correct the issue?

Thank you,
Matt