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

[MacPorts]

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

 Replying to [comment:24 i0ntempest]:
 > For 10.15 use Xcode 11. If you don't know the version you need to build
 this, take a look at the buildbot log of your system version, here on the
 right: https://ports.macports.org/port/mpv/details/
 Thank you for input, but it doesn't explain why this is the only port that
 refuses to build for me when all other builds just fine. The last working
 mpv
 (@0.33.1_1+audiocd+bluray+bundle+caca+dvd+jack+libarchive+network+opengl+osd+pulseaudio+python39+rubberband+screenshot+uchardet+x11)
 I have was built in April this year with this exact Xcode etc. I have been
 using Xcode 12 for the better part of a year now and 12.4 since soon after
 its release. I do not see any reason why this would be the point where I
 would need to ''downgrade'' a system that works in all other cases except
 for mpv.

 Do you know what might be the issue here though? Because nothing about the
 Apple originated build system has changed between the build of 0.33.1_1
 and now. Something in the updated port must be at fault here rather than a
 "too new" Xcode. I have tried to dig around myself, but not really been
 able to pinpoint the exact issue. I suspect something to do with waf (that
 I know almost nothing about at this point), but both seem to use wav
 v2.0.22, so I don't know.

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Ticket URL: <https://trac.macports.org/ticket/63694#comment:25>
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