How to install IPv6:
 1 - install NetBSD 1.2.1 (read NetBSD-INFO)
 2 - install IPv6 files:
  * gunziped and untar New.tar.gz (use z option of GNU tar)
  * NOTE: the script inst-new is provided for the next step.
  You use the list of new files (src-new):
   + if an entry is a directory the Makefile in the parent is up to date
     then you have nothing to do.
   + if an entry is a regular file copy it in the ordinary version
     (I use "cp -p XXX-new XXX")
 3 - rebuild everything ("make build" in /usr/src for all the
     utilities (it takes *time*)), "config XXX" and "make depend; make"
     for the kernel.
 4 - read KERNEL and HOWTO-USE

