Nonexistent mpi.default variable lets port upgrade fail

[Marko Käning]

Ooops, what does this error suddenly happen?

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--->  Updating MacPorts base sources using rsync
MacPorts base version 2.3.4 installed,
MacPorts base version 2.3.4 downloaded.
--->  Updating the ports tree
--->  MacPorts base is already the latest version

The ports tree has been updated. To upgrade your installed ports, you should run
  port upgrade outdated
The following installed ports are outdated:
kdetoys4                       4.10.5_0 < 4.10.5_1       
Error: Unable to open port: can't read "mpi.default": no such variable
To report a bug, follow the instructions in the guide:
    http://guide.macports.org/#project.tickets
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Greets,
Marko