[MacPorts] #57543: root6 build stage fails with Exit code: 2

[MacPorts]

#57543: root6 build stage fails with Exit code: 2
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  Reporter:  jfcaron3  |      Owner:  cjones051073
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.5.4
Resolution:            |   Keywords:
      Port:  root6     |
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Comment (by cjones051073):

 I might have an idea for a work around... Currently I configure root6 to
 use MacPorts provided TBB (I always favour this, than allowing root to use
 its own 'builtin' whenever I can) but maybe on 10.11 and older will work
 around this... I'll give it a try.

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Ticket URL: <https://trac.macports.org/ticket/57543#comment:4>
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