[MacPorts] #54548: clang++-mp-4.0 and clang++-mp-5.0 fail where /usr/bin/clang++ and g++-mp-6 succeed

[MacPorts]

#54548: clang++-mp-4.0 and clang++-mp-5.0 fail where /usr/bin/clang++ and g++-mp-6
succeed
----------------------------------+------------------------
  Reporter:  MarcusCalhoun-Lopez  |      Owner:  jeremyhu@…
      Type:  defect               |     Status:  new
  Priority:  Normal               |  Milestone:
 Component:  ports                |    Version:
Resolution:                       |   Keywords:
      Port:  clang-4.0            |
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Comment (by MarcusCalhoun-Lopez):

 Upstream seems to already have
 [https://github.com/ukoethe/vigra/commit/b2ff44fbffcfa3f9e2862d890f43ad7cf588f565
 committed a fix].

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Ticket URL: <https://trac.macports.org/ticket/54548#comment:4>
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