Strange behaviour of 'w'

Hi.

I noticed w does not show loged in users.
I just cvsuped and recompiled it but it just does not do its intended
job. Running as root:

:/usr/obj/usr/src/usr.bin/w]# ./w
 7:31AM  up 7 mins, 0 users, load averages: 0.00, 0.13, 0.10
USER             TTY      FROM              LOGIN_at_  IDLE WHAT

I am not sure why this happens since w seems to be working on my  other
boxes.

System: 
FreeBSD 6.0-RC1 #12: Wed Oct 12 09:06:40 UTC 2005

/etc/make.conf:

CPUTYPE?=pentiumpro
CFLAGS=         -O -pipe -march=pentiumpro
CXXFLAGS+=      -O -pipe -march=pentiumpro
COPTFLAGS=      -O -pipe -march=pentiumpro


Cheers,
Marcin.