[MacPorts] #65044: R @4.1.3 fails to configure on 10.4.11: Failed to configure R: Invalid value for configure.compiler

[MacPorts]

#65044: R @4.1.3 fails to configure on 10.4.11: Failed to configure R: Invalid
value for configure.compiler
---------------------------+----------------------------
  Reporter:  barracuda156  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.7.2
Resolution:                |   Keywords:  powerpc, tiger
      Port:  r             |
---------------------------+----------------------------

Comment (by barracuda156):

 That is, `gcc-4.x` have to be blacklisted, apparently. When invoked with
 `sudo port -v upgrade R configure.compiler=macports-gcc-7`, compiler value
 error does not occur.

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Ticket URL: <https://trac.macports.org/ticket/65044#comment:1>
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