[MacPorts] #58443: :error:build gcc6 cannot be built whilst libunwind-headers is installed.

[MacPorts]

#58443: :error:build gcc6 cannot be built whilst libunwind-headers is installed.
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  Reporter:  dbl001  |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:  MacPorts 2.6.0
 Component:  ports   |    Version:  2.5.4
Resolution:          |   Keywords:  gcc6
      Port:          |
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Comment (by kencu):

 Yes, this is true. We need a different UI message that doesn't tell people
 to report this as a bug, though, perhaps, like poppler, actually gives
 some instructions on what to do to fix the problem.

 Sorry our instructions are not more clear.

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Ticket URL: <https://trac.macports.org/ticket/58443#comment:1>
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