[MacPorts] #61474: gmp @6.2.0_1: clang: error: invalid version number in 'MACOSX_DEPLOYMENT_TARGET=11.0'

[MacPorts]

#61474: gmp @6.2.0_1: clang: error: invalid version number in
'MACOSX_DEPLOYMENT_TARGET=11.0'
-----------------------+--------------------
  Reporter:  pavibhai  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.6.4
Resolution:            |   Keywords:  bigsur
      Port:            |
-----------------------+--------------------

Comment (by kencu):

 it hasn't changed...your CLTs are out of date.

 Try opening Xcode.

 If that doesn't work, and the update doesn't show up in software update,
 you'll have to get them from Apple's Dev website.

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Ticket URL: <https://trac.macports.org/ticket/61474#comment:8>
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