[MacPorts] #72630: gpredict fails to require correct C standard: cc1: error: unrecognized command line option "-std=c11"

[MacPorts]

#72630: gpredict fails to require correct C standard: cc1: error: unrecognized
command line option "-std=c11"
---------------------------+--------------------
  Reporter:  barracuda156  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.10.7
Resolution:                |   Keywords:
      Port:  gpredict      |
---------------------------+--------------------

Comment (by Schamschula):

 I would have to see the full log file. Please attach.

 Judging by the use of gcc-4.2, you must be on a very old macOS version.

 gcc-4.2 does not support c11, and hence must be blacklisted.

 Note: I can only suggest fixes, as I don't have access to anything older
 than macOS Ventura.

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Ticket URL: <https://trac.macports.org/ticket/72630#comment:1>
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