[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):

 If you open Xcode.app, it will usually offer to upgrape the command line
 tools if they are out of date.

 It's a very easy thing to try, and I find this works after an Xcode update
 even when Software Update  isn't showing that the CLTs are out of date.

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Ticket URL: <https://trac.macports.org/ticket/61474#comment:5>
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