[MacPorts] #66250: xz fails to build with libunwind active

[MacPorts]

#66250: xz fails to build with libunwind active
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  Reporter:  opencoff      |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.8.0
Resolution:                |   Keywords:
      Port:  libunwind xz  |
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Comment (by kencu):

 that will break dozens of existing builds, but has to be done eventually

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Ticket URL: <https://trac.macports.org/ticket/66250#comment:3>
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