[MacPorts] #58031: harfbuzz @2.3.0 test errors

[MacPorts]

#58031: harfbuzz @2.3.0 test errors
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  Reporter:  kencu     |      Owner:  ryandesign
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  harfbuzz  |
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Comment (by kencu):

 Data point:

 Building `harfbuzz` `2.5.3` with `clang-5.0` against the `macports-
 libstdc++` headers using the PG `cxx11 1.1` on `10.7.5` passes all tests.
 This is the current default for 10.6 to 10.8.

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Ticket URL: <https://trac.macports.org/ticket/58031#comment:1>
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