[MacPorts] #56082: libsdl2 @2.0.8: error: unrecognized platform name macOS

[MacPorts]

#56082: libsdl2 @2.0.8: error: unrecognized platform name macOS
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  Reporter:  adamb2903  |      Owner:  jmroot
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:  highsierra
      Port:  libsdl2    |
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Comment (by thomaskchan):

 Ok, it's working now for me.

 Apparently I had xcode command line tools 9.3, but xcode itself was still
 on 8.3.1.

 Thanks for helping look into it!

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Ticket URL: <https://trac.macports.org/ticket/56082#comment:16>
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