- include opt_inet6.h of FreeBSD[34]/NetBSD(correct?) - '#if 0'-fy encap4_input() in FreeBSD4 temporally   struct protosw is not changed in FreeBSD4. some fixing is needed
- include opt_inet6.h of FreeBSD[34]/NetBSD(correct?)
- '#if 0'-fy encap4_input() in FreeBSD4 temporally
  struct protosw is not changed in FreeBSD4. some fixing is needed

MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame