[MacPorts] #71859: boost187 build error: pid.cpp: error: 'PROC_PPID_ONLY' was not declared in this scope

[MacPorts]

#71859: boost187 build error: pid.cpp: error: 'PROC_PPID_ONLY' was not declared in
this scope
---------------------------+--------------------
  Reporter:  barracuda156  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.10.5
Resolution:                |   Keywords:
      Port:  boost187      |
---------------------------+--------------------

Comment (by barracuda156):

 Issue with upstream: https://github.com/boostorg/process/issues/452

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Ticket URL: <https://trac.macports.org/ticket/71859#comment:1>
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