[MacPorts] #71592: qt5-qtbase @ 5.11.3_12 -- Failed to Configure "error: invalid value 'c++17' in '-std=c++17"

[MacPorts]

#71592: qt5-qtbase @ 5.11.3_12 -- Failed to Configure "error: invalid value 'c++17'
in '-std=c++17"
-------------------------+-----------------------
  Reporter:  RobK88      |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.10.5
Resolution:              |   Keywords:  elcapitan
      Port:  qt5-qtbase  |
-------------------------+-----------------------
Description changed by RobK88:

Old description:

> I am unable to upgrade `qt511-qtbase` to @ 5.11.3_12 on El Capitan. The
> port fails to configure.
>
> `error: invalid value 'c++17' in '-std=c++17`
>
> See attached configure.log

New description:

 I am unable to upgrade `qt511-qtbase` to @ 5.11.3_12 on El Capitan. The
 port fails to configure.

 `error: invalid value 'c++17' in '-std=c++17'`

 See attached configure.log

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Ticket URL: <https://trac.macports.org/ticket/71592#comment:2>
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