[MacPorts] #62177: mpv @0.33.0_2+audiocd+bluray+bundle+dvd+libarchive+network+opengl+osd+python39+rubberband: cannot convert value of type 'CALayerContentsFormat' to specified type 'String'

[MacPorts]

#62177: mpv
@0.33.0_2+audiocd+bluray+bundle+dvd+libarchive+network+opengl+osd+python39+rubberband:
cannot convert value of type 'CALayerContentsFormat' to specified type
'String'
---------------------+----------------------
  Reporter:  JDLH    |      Owner:  ionic@…
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.6.4
Resolution:          |   Keywords:
      Port:  mpv     |
---------------------+----------------------

Comment (by i0ntempest):

 If you don't trust the SDKs in that repo, there's http://xcodereleases.com
 to download any version of Xcode. SDKs can be extracted from Xcode app
 bundle. Release versions need a free Apple dev account and beta versions
 need a paid one.
 Looks like the root of the problem is mpv incorrectly enabling features
 only available on 10.14 on 10.13 because of the presence of 10.14 SDK. Idk
 if the upstream will accept this as a bug, but for now I may make a
 conditional patch based on Ken's discovery.

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Ticket URL: <https://trac.macports.org/ticket/62177#comment:18>
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