[MacPorts] #60345: R-app: error: Compiling for earlier than macOS 10.6 is no longer supported

[MacPorts]

#60345: R-app: error: Compiling for earlier than macOS 10.6 is no longer supported
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  Reporter:  LenoreHorner  |      Owner:  kjellpk
      Type:  defect        |     Status:  reopened
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.6.2
Resolution:                |   Keywords:
      Port:  R-app         |
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Comment (by kencu):

 FYI, you see that ibtool error quite often since xcode 10; I usually just
 reinplace 10.5 to 10.6 in the xib files affected.

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Ticket URL: <https://trac.macports.org/ticket/60345#comment:5>
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