[MacPorts] #70156: knot fails to build on 10.6: error: unknown type name 'sa_endpoints_t'

[MacPorts]

#70156: knot fails to build on 10.6: error: unknown type name 'sa_endpoints_t'
---------------------------+-----------------------------------------
  Reporter:  barracuda156  |      Owner:  catap
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.9.3
Resolution:                |   Keywords:  tiger, leopard, snowleopard
      Port:  knot          |
---------------------------+-----------------------------------------

Comment (by jmroot):

 This does of course set `platforms {darwin >= 15}`.

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Ticket URL: <https://trac.macports.org/ticket/70156#comment:1>
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