[MacPorts] #57324: Xcysden @1.5.60 build failure in Mojave with Macport 2.5.4

[MacPorts]

#57324: Xcysden @1.5.60 build failure in Mojave with Macport 2.5.4
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  Reporter:  wcchiu1988  |      Owner:  dstrubbe
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.5.4
Resolution:              |   Keywords:  mojave
      Port:  xcrysden    |
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Comment (by wcchiu1988):

 Can you tell me more on how to use the gcc7 but not gcc8 to build the
 xcyrsden? I'm not an expert on this. Thank you.

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Ticket URL: <https://trac.macports.org/ticket/57324#comment:5>
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