[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 jmroot):

 This code is likely trying to get `nullptr_t` in the global namespace by
 including `<stddef.h>`. Firstly, `nullptr_t` is a C++11 feature, and if a
 C++11 compiler is needed to build this port, it should indicate it by
 setting `compiler.cxx_standard 2011`. Secondly, `<stddef.h>` is a C
 compatibility header, and using those in C++ is deprecated. So while the
 headers on El Capitan may be buggy in that `<stddef.h>` doesn't provide
 all the functionality it should, it's more future-proof to include
 `<cstddef>` instead and use `std::nullptr_t`, which should neatly fix the
 El Capitan issue as well.

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Ticket URL: <https://trac.macports.org/ticket/62459#comment:2>
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