building system's libmilter with poll() support?

[Gregory Shapiro]

> What's the procedure to configure buildworld to get sendmail to build 
> libmilter using poll() instead of select()?

Add this to /etc/make.conf:

SENDMAIL_CFLAGS+=-D_FFR_WORKERS_POOL

And then rebuild/reinstall libmilter:

cd /usr/src/lib/libmilter/
make clean
make depend
make
make install

Note that bug 118824 has already asked for this to be part of the base.
I will likely make that the case for the HEAD and then give it some
testing time before MFC'ing.