[MacPorts] #68536: libretroshare fails to build on Sonoma: error: no template named 'binary_function' in namespace 'std'; did you mean '__binary_function'?

[MacPorts]

#68536: libretroshare fails to build on Sonoma: error: no template named
'binary_function' in namespace 'std'; did you mean '__binary_function'?
----------------------------+--------------------------
  Reporter:  barracuda156   |      Owner:  barracuda156
      Type:  defect         |     Status:  assigned
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.8.1
Resolution:                 |   Keywords:  sonoma
      Port:  libretroshare  |
----------------------------+--------------------------

Comment (by kencu):

 no log, but presumably need to set suitable older c++ standard

 https://en.cppreference.com/w/cpp/utility/functional/binary_function

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Ticket URL: <https://trac.macports.org/ticket/68536#comment:1>
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