Portupgrade Stale dependency: "specify -O to force"

[Rob]

Hi,

When I use commands from the portupgrade port, I get this message:

   Stale dependency: kde-3.2.3 --> autoconf-2.57_1 -- manually run
   'pkgdb -F' to fix, or specify -O to force.

I wanted to use the '-O' option, but that does not seem to exist.
I've tried 'pkgdb -O' or 'pkgdb -FO'

Is this '-O' suggestion mistake in the portupgrade port?

How can I use the force option?

Rob.