[MacPorts] #54949: gcc5 @5.4.0_2 fails to build on macOS 10.13

[MacPorts]

#54949: gcc5 @5.4.0_2 fails to build on macOS 10.13
-------------------------+------------------------
  Reporter:  matteopuel  |      Owner:
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:  highsierra
      Port:  gcc5        |
-------------------------+------------------------

Comment (by kencu):

 There are some patches out there if someone is interested to fix this, it
 appears:

 See this for gcc49:

 <https://lists.freebsd.org/pipermail/freebsd-ports-
 bugs/2016-September/346453.html> and
 <https://bugs.freebsd.org/bugzilla/attachment.cgi?id=174492&action=edit>

 and for gcc5:

 <https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216266>

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Ticket URL: <https://trac.macports.org/ticket/54949#comment:2>
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