Ports Name changes

[bsd at perimeter.co.za]

Hi all. 

Occasionally ports have their names changed (as happened yesterday with 
autoconf and automake).  Now when I run portupgrade I keep getting warnings 
that the names have changed, though there is no upgrade required. 

What steps should I follow to correct the names of my installed ports to 
match the latest names in the ports tree? 

would a portupgrade -f of each renamed port do the trick?  Or would that be 
like using a bulldozer to skim a bowl of custard? 

Regards,
Patrick.