[MacPorts] #64558: libomp @13.0.0_1 fails to build on 10.6

[MacPorts]

#64558: libomp @13.0.0_1 fails to build on 10.6
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  Reporter:  jmroot  |      Owner:  eborisch
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:  snowleopard
      Port:  libomp  |
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Comment (by ryandesign):

 Could we make the fix for #64549 only apply on 10.7 and later then?

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Ticket URL: <https://trac.macports.org/ticket/64558#comment:4>
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