[MacPorts] #68332: py39-pyobjc-9.0.1_0.darwin_17.x86_64 fails to build on macOS 10.13.6

[MacPorts]

#68332: py39-pyobjc-9.0.1_0.darwin_17.x86_64 fails to build on macOS 10.13.6
--------------------------+--------------------
  Reporter:  jlg89        |      Owner:  (none)
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.8.1
Resolution:               |   Keywords:
      Port:  py39-pyobjc  |
--------------------------+--------------------
Changes (by jlg89):

 * Attachment "py39-pyobjc_error_log.txt" added.

 Build log

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Ticket URL: <https://trac.macports.org/ticket/68332>
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