I just fixed that problem last night.  It was a bug in vfprintf.c.
You will have to revert to get your compiler working again.  I
ran using 12.16 while recompiling libc and then installed the new
libc.  That fixed the problem.

-- 
Phil Nelson                       NetBSD: http://www.netbsd.org
e-mail: phil@cs.wwu.edu           LPF: http://www.lpf.org
http://www.cs.wwu.edu/~phil       !gifs: http://www.lpf.org/Patents/Gif/Gif.html