[MacPorts] #55105: libsdl2 doesn't compile after upgrade to High Sierra

[MacPorts]

#55105: libsdl2 doesn't compile after upgrade to High Sierra
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  Reporter:  azakkerman  |      Owner:  jmroot
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  libsdl2     |
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Comment (by jmroot):

 Looks very similar to #54940, in which the user had forgotten to update
 Xcode.

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Ticket URL: <https://trac.macports.org/ticket/55105#comment:3>
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