portupgrade installing unexpected dependencies

[Patrick Lamaiziere]

Le Tue, 12 Feb 2008 21:18:56 +0800,
"Rong-en Fan" <grafan at gmail.com> a écrit :

> > cd /usr/ports/security/amavisd-new/ && make install clean
> > the whole installation is successfuly done without installing CURL
> > and openldap-client. (it is expected result for me)
> >
> > ...or em I wrong and I must add 'security/gnupg' =>
> > 'security/gnupg1' in to ALT_PKGDEP in pkgtools.conf?
> 
> Yes, according to /usr/ports/UPDATING.

Is there a way or a tool to know the alternate dependencies ? I've got
720 ports installed on my box...

Thanks, regards.