mhonarc -scan producing unwanted output for iso-8859-1 special characters

[Michael de Beer <michael@xxxxxxxxxx>]

People email into my mhonarc installation with a Subject line like

  Subject: =?iso-8859-1?q?Norwegischer_Bischof_Gunnar_J=2E_St=E5lsett_feier?=

In the mhonarc output pages this is all correctly rendered in HTML.

  Subject: Norwegischer Bischof Gunnar J. Stålsett feier

However, when I do
  shell> mhonarc -quiet -nolock -reverse -scan -outdir www/2005/02

It produces subject lines like
  =?iso-8859-1?q?Norwegischer_Bischof_Gunnar_J=2E_St=E5lsett_feier?=

That is not what I want -- I want it to produce the subject like the
mhonarc output pages.  Is there a
 -  switch in mhonarc or 
 -  a patch to mhonarc or 
 -  a conversion utility or 
 -  a perl library function
that will produce/convert the text into what I want?

Thank you
Michael de Beer
michael@xxxxxxxxxx