[MacPorts] #61647: mpv build fails on Mojave

[MacPorts]

#61647: mpv build fails on Mojave
---------------------------+----------------------
  Reporter:  ShadSterling  |      Owner:  Ionic
      Type:  defect        |     Status:  reopened
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.6.4
Resolution:                |   Keywords:
      Port:  mpv           |
---------------------------+----------------------

Comment (by ra1nb0w):

 {{{
 cd
 /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs
 sudo ln -s MacOSX.sdk MacOSX10.14.sdk
 }}}
 fix the problem but it is a hack.

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Ticket URL: <https://trac.macports.org/ticket/61647#comment:11>
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