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

[MacPorts]

#63694: mpv: fatal error encountered while reading from module 'Foundation'
---------------------------+------------------------
  Reporter:  ShadSterling  |      Owner:  i0ntempest
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.7.1
Resolution:                |   Keywords:
      Port:  mpv           |
---------------------------+------------------------

Comment (by Gandoon):

 I have a similar, but not identical issue as I am on MacOS 10.15.7
 (19H1519) with Swift 5.3.2 from Xcode 12.4 (12D4e).
 The log is not identical, but it does seem to end with a similar error,
 and I cannot really figure out how to get it to build. Fortunately I still
 have a working version installed, but it is still not possible to build
 the 0.34.0_0 version. The dependencies have already been rebuilt but that
 does not help.


 I cannot (and have little interest in due to software that will break) at
 this point upgrade to MacOS 11.\\
 All other ports I have installed upgrades fine (albeit sometimes with some
 manual tweaking needed).
 \\
 I append my log as well
 (mpv-0.34.0_0-OSX_10.15.7_(19H1519)-Swift_5.3.2-Xcode_12.4_(12D4e)-main.log)


 Any input would be appreciated.

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Ticket URL: <https://trac.macports.org/ticket/63694#comment:23>
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