[MacPorts] #72144: keybase @6.4.0_0: build fails on 10.14.6 with "fatal error: 'UniformTypeIdentifiers/UniformTypeIdentifiers.h' file not found"

[MacPorts]

#72144: keybase @6.4.0_0: build fails on 10.14.6 with "fatal error:
'UniformTypeIdentifiers/UniformTypeIdentifiers.h' file not found"
----------------------+--------------------
  Reporter:  larryv   |      Owner:  (none)
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  keybase  |
----------------------+--------------------

Comment (by ryandesign):

 That header is
 [https://developer.apple.com/documentation/uniformtypeidentifiers only in
 macOS 11 and later].

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Ticket URL: <https://trac.macports.org/ticket/72144#comment:1>
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