Weird amd64-current build failure

[Hisashi T Fujinaka <htodd%twofifty.com@localhost>]

Compiling groff.7 with -j8 and -j4 yields:

--- groff.html7 ---
#    format  man/groff.html7
/usr/src/obj.amd64/tooldir.NetBSD-5.99.49-amd64/bin/nbmandoc -Thtml 
-Oman=../html%S/%N.html -Ostyle=../style.css  groff.7 > groff.html7.tmp &&  mv 
groff.html7.tmp groff.html7
groff.7:1776:1: FATAL: static buffer exhausted
*** [groff.html7] Error code 4

I do have 8 cores on this board.

--
Hisashi T Fujinaka - htodd%twofifty.com@localhost
BSEE(6/86) + BSChem(3/95) + BAEnglish(8/95) + MSCS(8/03) + $2.50 = latte