[MacPorts] #63386: R-app does not build on MacOS 11

[MacPorts]

#63386: R-app does not build on MacOS 11
---------------------------+---------------------------
  Reporter:  LenoreHorner  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.7.99
Resolution:                |   Keywords:  R-app Big Sur
      Port:                |
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Changes (by LenoreHorner):

 * Attachment "R-app_main.log" added.

 R-app main log from build attempt

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Ticket URL: <https://trac.macports.org/ticket/63386>
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