portsdb -Uu duplicate entry warnings

[bob self]

I've been told that these messages are not a problem. But I do think that they
are warnings. How can I get rid of these warnings?

Warning: Duplicate INDEX entry: freeciv-gtk2-2.0.2
Warning: Duplicate INDEX entry: mod_frontpage2-5.0.2.2635
Warning: Duplicate INDEX entry: mod_jk2-apache2-2.0.4
Warning: Duplicate INDEX entry: mod_rpaf-ap2-0.5

I get these after running 'portsdb -Uu

I've searched the archives but haven't found the solution.

Bob