port -v selfupdate
Next, upgrade the ports as usual :
port -v upgrade outdated
After a while, the port "db46" it hit an error :
configure: error: The Java compiler javac failed
It seems like after the installation of XCodes 4.1, java is not included.
After meddling around for a while, this is how to trigger Lion to install java. Execute the program "java" as a normal user and it should prompt to install the required software component. Install it and re-run "port -v upgrade outdated"