[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:  closed
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:  fixed       |   Keywords:  highsierra
      Port:  gcc5        |
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Comment (by BYUMcKay):

 Replying to [comment:13 ryandesign]:
 > BYUMcKay, pdftk doesn't attempt to use gcc5; it attempt to use gcc47,
 and fails as described in #48528.

 Not that it matters, since it looks like it will get fixed, but when I try
 to install pdftk, it tells me it needs gcc5, not gcc47.  I'm wondering why
 it says gcc5 if it's really looking for gcc47?  I'm just looking for
 clarification so I don't get bitten the next time.

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Ticket URL: <https://trac.macports.org/ticket/54949#comment:16>
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