[MacPorts] #67212: spdlog @1.11.0: error: 'pthread_threadid_np' was not declared in this scope

[MacPorts]

#67212: spdlog @1.11.0: error: 'pthread_threadid_np' was not declared in this scope
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  Reporter:  barracuda156  |      Owner:  judaew
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.8.1
Resolution:                |   Keywords:  tiger, leopard
      Port:  spdlog        |
---------------------------+----------------------------

Comment (by ryandesign):

 Does this patch work for you on 10.5? It should have no effect on 10.6 or
 later.

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Ticket URL: <https://trac.macports.org/ticket/67212#comment:2>
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