In some mail I received from Patrick Welche, sie wrote
> 
> Can anyone tell me what I am doing wrong please?
> 
> modload -dv /usr/lkm/if_ipl.o (or anything else)
> ld -A /netbsd -e _xxxinit -o ip_fil -T 0 /usr/lkm/if_ipl.o
> Undefined entry symbol `_xxxinit'
> ld: Spurious undefined symbols: # undefined symbols 1, reported 0
> modload: can't prelink `/usr/lkm/if_ipl.o' creating `/usr/lkm/if_ipl'
> 
> in the current kernel, the options LKM and PFIL_HOOKS are enabled.

Hmmm, I'm currently updating the -current source and you may have caught
it in an inbetween state.