[MacPorts] #67545: gnucash @5.0_1: error: no template named 'unary_function' in namespace 'std'

[MacPorts]

#67545: gnucash @5.0_1: error: no template named 'unary_function' in namespace
'std'
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  Reporter:  tenzap   |      Owner:  drkp
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.8.1
Resolution:           |   Keywords:
      Port:  gnucash  |
----------------------+----------------------

Comment (by ryandesign):

 The port was updated to 5.3 last week but this problem remains on High
 Sierra and earlier.

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Ticket URL: <https://trac.macports.org/ticket/67545#comment:4>
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