[MacPorts] #54785: R-app 1.68.1 fails to build on 10.13 beta 9 (high sierra) with Xcode 9.0 beta 6

[MacPorts]

#54785: R-app 1.68.1 fails to build on 10.13 beta 9 (high sierra)  with Xcode 9.0
beta 6
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 Reporter:  AP1010  |      Owner:
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.4.1
 Keywords:          |       Port:  R-app
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 The build fails with:
 ** BUILD FAILED **

 and numerous:
  '_tableView' is unavailable

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Ticket URL: <https://trac.macports.org/ticket/54785>
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