Trouble Building on FreeBSD 4.6.1 RC2.

I'm having trouble building BSD-Airtools on my system, with a copy of
the ports collection from last week.  When typing make, I got the
message that I needed to upgrade.  Looking in the makefile, I saw the
file it was looking for (if_wavelan_ieee.h).  I found it in another
location on my system (somewhere in the source) and copied it to where
it was expected.  Now when making, I get the following message:

gcc -Wall -I/usr/local/include -c main.c
main.c: In function `start_loop':
main.c:274: `WI_DEBUG_CHAN' undeclared (first use in this function)
main.c:274: (Each undeclared identifier is reported only once
main.c:274: for each function it appears in.)
*** Error code 1

Stop in /usr/ports/net/bsd-airtools/work/bsd-airtools/dstumbler.
*** Error code 1

I'm not sure what the problem is, but I'd really like to get this
working.  From what I've seen off the list archives, people seem to be
doing better with the development versions, but they are a bit difficult
to get to with the CVS being down and all that, I understand.  If
someone could throw some information my way, most especially info
regarding making it work on FreeBSD 4.6, I'd be most appreciative.

Thanks very much,

Fish