[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
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  Reporter:  matteopuel  |      Owner:
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:  highsierra
      Port:  gcc5        |
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Comment (by ryandesign):

 Replying to [comment:3 kencu]:
 > Also this is relevant
 <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81037>

 Ok, so from that bug report, this is what they committed to fix it:

 https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=253181

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Ticket URL: <https://trac.macports.org/ticket/54949#comment:4>
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