[MacPorts] #67145: After recent clang_compilers update R fails to configure on 10.7 (all other macOS are fine)

[MacPorts]

#67145: After recent clang_compilers update R fails to configure on 10.7 (all other
macOS are fine)
---------------------------+------------------------
  Reporter:  barracuda156  |      Owner:  i0ntempest
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.8.1
Resolution:                |   Keywords:  lion
      Port:  R             |
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Comment (by barracuda156):

 An easy fix would be perhaps to blacklist Clang-15 on 10.7, but maybe
 anything better?

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Ticket URL: <https://trac.macports.org/ticket/67145#comment:2>
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