In article <200103050952.f259qQx08874@sigmet.ghs.com>,
Ross Harvey <ross@ghs.com> wrote:
>> From: Matthias Scheler <tron@netbsd.org>
>>
>> Module Name:	sharesrc
>> Committed By:	tron
>> Date:		Mon Mar  5 06:52:12 UTC 2001
>>
>> Modified Files:
>> 	sharesrc/share/mk: bsd.man.mk
>>
>> Log Message:
>> Invoke "groff" directly when building manual pages, "nroff" is just a
>> shell script wrapper. This saves at least one fork(2) and one exec(2)
>> while creating each manual page and should thus speed up builds.
>
>Just to be picky, the nroff wrapper adds no forks. :-)

I would back this out. Unix always used nroff for building man pages.
We have UPDATE=yes for that sort of optimization (we don't build manpages
too often).

christos