Milter-greylist

Hi everyone.

I realize this might be a little off-topic, though not entirely.  I
want to add spf support to my milter-greylist implementation.  I'm
having trouble getting an spf library in RPM format for a redhat 7.2
system.  Any clues?  I've searched far and wide and tried rebuilding
from various tarballs and src rpms to no avail.  Are there any rpms
available for my ancient system?

Thanks.

-Robert