variant calculations when cleaning

[Jeremy Lavergne]

Do we have a use case for calculating variants while performing clean?

$ sudo port clean --all installed
--->  Cleaning akonadi
--->  Cleaning analitza
--->  Cleaning antlr
--->  Cleaning ark
--->  Cleaning aspell
--->  Cleaning aspell-dict-en
--->  Cleaning atk
--->  Cleaning attica
--->  Cleaning audiofile
--->  Cleaning autoconf
--->  Cleaning automake
--->  Cleaning automoc
--->  Cleaning avahi
--->  Cleaning bison
--->  Cleaning blinken
--->  Cleaning boost
--->  Cleaning build
--->  Cleaning bzip2
Error: cairo: Variant no_x11 conflicts with x11
Error: Unable to open port: Error evaluating variants

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