This already is fixed in -current. I'd been defopt'ing a lot more
options, one by one; a couple of files got updated in my tree but 
didn't get committed.

If you can't wait for tomorrow's sup you can apply the patch below to
sys/conf/files.


Index: sys/conf/files
===================================================================
RCS file: /cvsroot/src/sys/conf/files,v
retrieving revision 1.217
retrieving revision 1.219
diff -c -r1.217 -r1.219
*** files	1998/07/05 07:20:27	1.217
--- files	1998/07/05 18:59:40	1.219
***************
*** 1,4 ****
! #	$NetBSD: files,v 1.217 1998/07/05 07:20:27 jonathan Exp $
  
  #	@(#)files.newconf	7.5 (Berkeley) 5/10/93
  
--- 1,4 ----
! #	$NetBSD: files,v 1.219 1998/07/05 18:59:40 jonathan Exp $
  
  #	@(#)files.newconf	7.5 (Berkeley) 5/10/93
  
***************
*** 35,41 ****
  defopt	COMPAT_SUNOS
  defopt	COMPAT_SVR4
  defopt	COMPAT_ULTRIX
! 
  # networking protocols
  defopt	INET
  defopt	opt_atalk.h	NETATALK
--- 35,42 ----
  defopt	COMPAT_SUNOS
  defopt	COMPAT_SVR4
  defopt	COMPAT_ULTRIX
! defopt  opt_compat_netbsd.h	COMPAT_09 COMPAT_10 COMPAT_11 COMPAT_12
! 				COMPAT_13 COMPAT_NOMID
  # networking protocols
  defopt	INET
  defopt	opt_atalk.h	NETATALK