[Mimedefang] Installing clamav with MIMEDefang

[Al Sparks]

I'm looking at installing clamav on a system running MIMEDefang.  This
HOWTO
   http://sial.org/howto/mimedefang/clamav/#s2.1
says that I should install clamav before installing MIMEDefang.  I
already have MIMEDefang installed.

Is there docs out there that tells how to install clamav with an
already running MIMEDefang system?
  === Al