yabm (Yet Another Bandwidth Meter) Installation Notes

 * You must have libpng installed.
 * There is no configure/autoconf/etc, compile with
 	make
   then install by doing a
	make install

 * There is a startup script for FreeBSD in scripts/ 
   	cd scripts && make
   This will create a file called yabm.sh, copy this to /usr/local/etc/rc.d
   You will have to add the following to /etc/rc.conf to use it
   	yabm_enable="YES"

   Then, for each interface you want to monitor you add the following, where the 
   number 0 has to be increased for each interface
   Example
   yabm_if0="fxp0"
   yabm_if0_output="/path/to/image.png"
   yabm_if0_flags="-m 512k -t"

   Monitoring ip-aliases is like monitoring interfaces except the keyword
   alias is used instead of if
   Example
   yabm_alias0="192.168.0.7"
   yabm_alias0_output="/path/to/image2.png"
   yabm_alias0_flags=""