[MacPorts] #70865: qt6-qtmultimedia: error: use of undeclared identifier 'kAudioObjectPropertyElementMain'

[MacPorts]

#70865: qt6-qtmultimedia: error: use of undeclared identifier
'kAudioObjectPropertyElementMain'
-------------------------------+---------------------------------
  Reporter:  mouse07410        |      Owner:  MarcusCalhoun-Lopez
      Type:  defect            |     Status:  assigned
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:
Resolution:                    |   Keywords:  bigsur
      Port:  qt6-qtmultimedia  |
-------------------------------+---------------------------------

Comment (by mouse07410):

 Help would be appreciated! This problem prevents upgrades of other
 Macports packages (e.g., mkvtoolnix and x264transcode).

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Ticket URL: <https://trac.macports.org/ticket/70865#comment:2>
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