[MacPorts] #55534: valgrind: failed check for a supported compiler on macOS Sierra (Version 10.12.6)

[MacPorts]

#55534: valgrind:  failed check for a supported compiler on macOS Sierra (Version
10.12.6)
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  Reporter:  ierofant  |      Owner:
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  valgrind  |
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Comment (by kencu):

 see also [ticket:55496].

 This looks to be essentially a duplicate of that ticket, but it looks like
 the error is not so much 10.12 or 10.13 but Xcode 9.x.

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Ticket URL: <https://trac.macports.org/ticket/55534#comment:1>
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