[MacPorts] #69697: Error: Failed to configure mpv: no files matched glob pattern "MacOSX*.sdk"

[MacPorts]

#69697: Error: Failed to configure mpv: no files matched glob pattern "MacOSX*.sdk"
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  Reporter:  jf      |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:  mpv     |
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Comment (by jf):

 I do have my Xcode.app install selected, with `sudo xcode-select -s
 ~/USR_LOCAL/Xcode.app/Contents/Developer/`, and in fact I just set it
 again, just to be sure. I still have the same issue.

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Ticket URL: <https://trac.macports.org/ticket/69697#comment:6>
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