[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
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 Reporter:  jlg89   |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.8.1
 Keywords:          |       Port:  py39-pyobjc
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 Darwin kim.kairosnet.com 17.7.0 Darwin Kernel Version 17.7.0: Fri Oct 30
 13:34:27 PDT 2020; root:xnu-4570.71.82.8~1/RELEASE_X86_64 x86_64

 Probably has something to do with the lack of Metal.

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