[MacPorts] #59584: macports-clang versions <= 3.7 don't understand -stdlib=macports-libstdc++

[MacPorts]

#59584: macports-clang versions <= 3.7 don't understand -stdlib=macports-libstdc++
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  Reporter:  kencu   |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  base    |    Version:  2.6.2
Resolution:          |   Keywords:
      Port:          |
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Comment (by programmingkidx):

 Good news, I was able to build icu using gcc7. Thank you both for the
 help. Is there anything I could do to help with fixing the icu building
 problem?

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Ticket URL: <https://trac.macports.org/ticket/59584#comment:13>
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