[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):

 I'm having this same issue with libsdl2 today when doing "port upgrade
 outdated".

 High Sierra 10.13.4
 Xcode command line tools 9.3

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Ticket URL: <https://trac.macports.org/ticket/56082#comment:3>
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