[MacPorts] #61805: gd2: clang: error: invalid version number in 'MACOSX_DEPLOYMENT_TARGET=11.1'

[MacPorts]

#61805: gd2: clang: error: invalid version number in
'MACOSX_DEPLOYMENT_TARGET=11.1'
----------------------+------------------------
  Reporter:  k6wx     |      Owner:  ryandesign
      Type:  defect   |     Status:  closed
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:  invalid  |   Keywords:  bigsur
      Port:  gd2      |
----------------------+------------------------

Comment (by ryandesign):

 Installing the matching Xcode command line tools should resolve the issue.
 You will also need to clean the affected port(s) before trying again e.g.
 `sudo port clean gd2`

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Ticket URL: <https://trac.macports.org/ticket/61805#comment:15>
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