[MacPorts] #62459: wxMaxima @21.02.0: error: unknown type name 'nullptr_t'; did you mean 'std::nullptr_t'?

[MacPorts]

#62459: wxMaxima @21.02.0: error: unknown type name 'nullptr_t'; did you mean
'std::nullptr_t'?
-------------------------+--------------------------
  Reporter:  dyne2meter  |      Owner:  MSoegtropIMC
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.4
Resolution:              |   Keywords:  elcapitan
      Port:  wxMaxima    |
-------------------------+--------------------------

Comment (by MSoegtropIMC):

 I reported this upstream (https://github.com/wxMaxima-
 developers/wxmaxima/issues/1523) and asked if they want to change their
 code to use std::bullptr_t and <cstddef> or force C++11. As far as I
 understood @jmroot, both options would work.

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Ticket URL: <https://trac.macports.org/ticket/62459#comment:3>
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