[MacPorts] #69840: R-app on Mojave requires install of Xcode 11

[MacPorts]

#69840: R-app on Mojave requires install of Xcode 11
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  Reporter:  dyne2meter  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.9.3
Resolution:              |   Keywords:
      Port:  R-app       |
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Changes (by dyne2meter):

 * Attachment "main.log.gz" added.

 main.log

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Ticket URL: <https://trac.macports.org/ticket/69840>
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