Both ybin and mkofboot set their PATH to:
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

mkofboot calls ybin to do all the actual work aside from creating the
filesystem so ybin must be in the PATH known to mkofboot.  I would
suggest /usr/local/sbin

mkofboot can be anywhere but /usr/local/sbin makes sense.

ybin.conf should be in /etc later it will be possible to specify the
config file on the ybin command line. Right now you can change this by
editing the mkofboot and ybin scripts and changing the CONF variable
at the beginning.

yaboot can be installed where you like but /boot/yaboot and
/etc/yaboot.conf would make sense. This is where the default
configuration file assumes they are.

The included ofboot.b script should be in /boot but you may put it
anywhere, just change the wrapper= line in ybin.conf to the full path
to this file.
