[MacPorts] #64777: mpv 0.34.1: Xcode is required even for the precompiled binary

[MacPorts]

#64777: mpv 0.34.1: Xcode is required even for the precompiled binary
------------------------+--------------------
 Reporter:  dardo82     |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.7.1
 Keywords:  highsierra  |       Port:  mpv
------------------------+--------------------
 MPV needs Xcode, otherwise it prints an error:

 {{{
 dyld: Library not loaded: @rpath/libswiftAVFoundation.dylib
   Referenced from: /opt/local/bin/mpv
   Reason: image not found
 }}}

 All the missing libraries are available in {{{/usr/lib/swift}}}, \\
 but LC_RPATH (checked with {{{otool -l $(which mpv)}}}) \\
 points only to {{{/opt/local/lib}}} and the Xcode directory. \\
 \\
 Is this issue caused by the way the port is built \\
 or should it be fixed upstream instead of here?

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Ticket URL: <https://trac.macports.org/ticket/64777>
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