[MacPorts] #60161: fish @3.1.0: error: field has incomplete type 'struct itimerval'

[MacPorts]

#60161: fish @3.1.0: error: field has incomplete type 'struct itimerval'
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  Reporter:  kencu   |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:  haspatch
      Port:  fish    |
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Comment (by kencu):

 looks like at least 10.12 and less need this patch. Probably fine to apply
 it always -- must be getting pulled in some other way on 10.14 and up. Not
 sure about 10.13 -- no buildbot at present.

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Ticket URL: <https://trac.macports.org/ticket/60161#comment:2>
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