[MacPorts] #67922: macports-libcxx does not support +universal on Intel?

[MacPorts]

#67922: macports-libcxx does not support +universal on Intel?
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  Reporter:  barracuda156     |      Owner:  kencu
      Type:  defect           |     Status:  closed
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.8.1
Resolution:  fixed            |   Keywords:
      Port:  macports-libcxx  |
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Comment (by ryandesign):

 Seems like you would at least want to enforce that if the universal
 variant of macports-libcxx is selected, then the universal variant of
 clang-11 must be selected (via the active_variants 1.1 portgroup), and
 similarly when the variant is not selected.

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Ticket URL: <https://trac.macports.org/ticket/67922#comment:14>
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