[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 BYUMcKay):

 Replying to [comment:1 ryandesign]:
 > Yeah, I noticed that too. Here's the log from the buildbot:
 >
 >
 https://build.macports.org/builders/ports-10.13_x86_64-builder/builds/1170
 >
 > We've already marked gcc49 and earlier incompatible with High Sierra.
 Simplest would be to mark gcc5 incompatible too. gcc6 and later build fine
 on High Sierra.

 Right now pdftk breaks because of gcc5.  I did a (very simple) test and
 could not get pdftk to compile using gcc6 because gcj is no longer
 present. So, this is a request not to mark it as incompatible, but rather
 to apply the changes to fix gcc5 for now.  I have reached out to the
 author of pdftk as to whether it is possible to compile using gcc6, but
 have not had a response yet.

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Ticket URL: <https://trac.macports.org/ticket/54949#comment:5>
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