Although I can now burn CDs just fine using a combination of mkhybrid
and cdrecord, I've found that all symlinks just show up a 0 length
files. Additionally, all files end up being owned by root/wheel. Here's
the mkhybrid command I use:

mkhybrid -b boot-big.fs -c boot.catalog -J -R -T -o NetBSD.iso /

The -R is supposed to turn on RockRidge, which should give me my
symlinks, but it doesn't seem to do that. Filenames with leading .'s and
long filenames (up to a point) seem to be created just fine.

Any idea what I am doing wrong?