[MacPorts] #61531: R @4.0.3 build failed with MacOS BigSur

[MacPorts]

#61531: R @4.0.3 build failed with MacOS BigSur
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  Reporter:  Tommaso93  |      Owner:  kjellpk
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.6.4
Resolution:             |   Keywords:
      Port:  R          |
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Comment (by thermalecology):

 Yep,

  clang: error: invalid version number in 'MACOSX_DEPLOYMENT_TARGET=11.0'

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Ticket URL: <https://trac.macports.org/ticket/61531#comment:5>
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