I notice this issue came up a few weeks ago, but I am running into it just
now. I have a new 1.6 ftp install, so I cvs'd the current src tree in order
to build a new kernel kernel:

nbsdubar: {35} config GENERIC
../../../../netinet6/files.netipsec:4: syntax error
../../../../conf/files:169: syntax error
../../../../conf/files:217: syntax error
../../../../conf/files:407: undefined attribute `wlan'
../../../../conf/files:413: undefined attribute `wlan'
*** Stop.

I have the file as fixed by Jason:

#       $NetBSD: files.netipsec,v 1.2 2002/10/12 15:41:24 thorpej Exp $

Weird, huh?

I reproduced this identical error on another machine on which I have tracked
current since early last month. Same thing, after cvs updating src.

Best,

-- 
Bob Bernstein
at                          
Esmond, Rhode Island
USA