[MacPorts] #65753: gcc7 7.5.0.3 build failure Darwin

[MacPorts]

#65753: gcc7 7.5.0.3 build failure Darwin
---------------------+--------------------
 Reporter:  geoffd2  |      Owner:  (none)
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.7.2
 Keywords:           |       Port:  gcc7
---------------------+--------------------
 Deactivated libunwind-headers as instructed, restarted, build fails , see
 log.

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Ticket URL: <https://trac.macports.org/ticket/65753>
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