[MacPorts] #67244: svt-av1 fails on Tiger: error: '_SC_NPROCESSORS_ONLN' undeclared (first use in this function)

[MacPorts]

#67244: svt-av1 fails on Tiger: error: '_SC_NPROCESSORS_ONLN' undeclared (first use
in this function)
---------------------------+--------------------
  Reporter:  barracuda156  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.8.1
Resolution:                |   Keywords:  tiger
      Port:  svt-av1       |
---------------------------+--------------------

Comment (by ryandesign):

 legacysupport should help with this (https://github.com/macports/macports-
 legacy-support/pull/8)

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Ticket URL: <https://trac.macports.org/ticket/67244#comment:1>
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