ks@ub.uni-mainz.de said:
> 	  .PATH: ${.CURDIR}/../lib/crt/bootsec/
> 	  SRCS+= fraglist.S 

This should be unnecessary. This is set in ../Makefile.booters.
I admit that there is some lossage in the Makefiles which
makes that a single "make netboot.sym" doesn't work. This
does the job for me:
make
make netboot.sym

>    /usr/mdec/installboot -b 17 -v netboot.sym /dev/rvnd0a 

It should be installed like a normal disk bootblock,
ie without the "-b 17".

best regards
Matthias