fbsd64# cd /usr/ports/net/bmon/
fbsd64# make
choose option to build with out DBI
check it works
fbsd64# ./work/bmon-2.1.0/src/bmon
get workon.sh and image
fbsd64#cd /tmp
fbsd64#wget http://chrisbuechler.com/m0n0wall/downloads/workon.sh
fbsd64#wget http://m0n0wall.jpcompserv.net/generic-pc-1.32.img
open the image
fbsd64# bash workon.sh generic-pc-1.32.img
put bmon in the image
[root@fbsd64 /tmp/mnt2]# cp /usr/ports/net/bmon/work/bmon-2.1.0/src/bmon usr/local/sbin/
now you need to edit etc/rc.initial to add the option to run it from console etc.
when finished exit and now your image is closed and modified.
[root@fbsd64 /tmp/mnt2]# exit
exit
fbsd64#