[MacPorts] #55001: R-app 1.68 on macOS 10.13 build failure

[MacPorts]

#55001: R-app 1.68 on macOS 10.13 build failure
--------------------------+-------------------
 Reporter:  tempesti0n1c  |      Owner:
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.4.1
 Keywords:                |       Port:  R-app
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 R-app can be built successfully on macOS 10.12 but not 10.13. main.log
 attached.

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Ticket URL: <https://trac.macports.org/ticket/55001>
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