[MacPorts] #61541: gd2 2.3.0_0 +x11.darwin on Intel/BigSur: clang: error: invalid version number in 'MACOSX_DEPLOYMENT_TARGET=11.0'

[MacPorts]

#61541: gd2 2.3.0_0 +x11.darwin on Intel/BigSur: clang: error: invalid version
number in 'MACOSX_DEPLOYMENT_TARGET=11.0'
------------------------+--------------------
  Reporter:  shibukawa  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.6.4
Resolution:             |   Keywords:
      Port:             |
------------------------+--------------------
Changes (by shibukawa):

 * Attachment "config.log" added.


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Ticket URL: <https://trac.macports.org/ticket/61541>
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