SENDMAIL_MC & making world

[Yar Tikhiy]

All,

I'd like to set SENDMAIL_MC in my /etc/make.conf files conditionally
so that it is not set when I'm making {build,install}world.  I
upgrade several machines over NFS from a single build server, and
of course installworld breaks if SENDMAIL_MC differs from what was
set during buildworld.  At the same time, I'd like to have SENDMAIL_MC
set for the rest of the time on the machines because `hostname` is
not a suitable way to construct the .mc names on them due to local
setup peculiarities.  Any ideas how to achieve this effect?

-- 
Yar