[MacPorts] #74236: rsync @3.4.4_0 fails to build on macOS < 10.10

[MacPorts]

#74236: rsync @3.4.4_0 fails to build on macOS < 10.10
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  Reporter:  scrutinizer11  |      Owner:  ryandesign
      Type:  defect         |     Status:  closed
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.12.5
Resolution:  fixed          |   Keywords:  legacy-os
      Port:  rsync          |
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Comment (by fhgwright):

 Should that apply in the usual dynamically-linked cases where the
 distributed binary doesn't actually contain the `legacy-support` code?

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Ticket URL: <https://trac.macports.org/ticket/74236#comment:8>
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