proclint hangs

I was running proclint to test a new rc.file when proclint just hung,
well after the new rc.file. It hung at a point where another rc.file
would be called. That rc.file selects delivery options for my
sometimes-gzipped mail folders. The weird thing is, is that mail is
still filtered and delivered ok through this portion of my procmail.
So why does proclint hang here without giving any indication why? The
file that it hangs on is called rc.zipset, and that continues to work.
I don't get it. :-( 
David

Here is the proclint output at the point where it stops. I have to ^C
to get out at this point.

   32:R<1> :0
   33:C<1> * ^TO_procmail
   34:A<2>         {
   35:R<2>         :0fh
   36:A<2>         | egrep -v '^(Resent-|X-)'
   37:=<2>         CURRENT_FOLDER=$HOME/IN/IN.Procmail

And here is the recipe from the rc.file that hangs proclint.

:0
* ^TO_procmail
        {   
        :0fh
        | egrep -v '^(Resent-|X-)'
        CURRENT_FOLDER=$HOME/IN/IN.Procmail
        INCLUDERC=$DELIVER
        }

# DELIVER is defined at the top of that file. This is the first call
# DELIVER, which is just another rc.file. DELIVER=$PMDIR/rc.zipset