[MacPorts] #64669: r fails to configure on Tiger without specifying gcc7 on command line

[MacPorts]

#64669: r fails to configure on Tiger without specifying gcc7 on command line
---------------------------+----------------------------
  Reporter:  barracuda156  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.7.1
Resolution:                |   Keywords:  powerpc, tiger
      Port:  r             |
---------------------------+----------------------------
Changes (by barracuda156):

 * Attachment "main.log" added.


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Ticket URL: <https://trac.macports.org/ticket/64669>
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