R: Could not find package - using ports

[Luca Presotto]

> The reason that portupgrade -P was not using packages is that, by
> default it fetches packages  built against the tree that's on the
> install disks, so there wont be any for updated ports.
> 
> You can set portupgrade to fetch packages for the 7-stable development
> branch (you can google for how to do this). For the most part this
will
> work, but occasionally there will be library problems.

Thank you, now it's clear.
I will  try this as soon as I can.

Luca