[MacPorts] #63694: mpv build fails: fatal error encountered while reading from module 'Foundation'

[MacPorts]

#63694: mpv build fails: fatal error encountered while reading from module
'Foundation'
---------------------------+--------------------
  Reporter:  ShadSterling  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.7.1
Resolution:                |   Keywords:
      Port:  mpv           |
---------------------------+--------------------

Comment (by i0ntempest):

 I got a similar (or identical) error yesterday before upgrading my Hack to
 Monterey, but with the newest Xcode I seem to no longer getting it so I
 just ignored it... it's building for me on 12.0.1. So maybe update your OS
 to 11.6.1 or 12.0.1? Worst case downgrading Xcode to 12 should work just
 like last time.

-- 
Ticket URL: <https://trac.macports.org/ticket/63694#comment:1>
MacPorts <https://www.macports.org/>
Ports system for macOS