[MacPorts] #55507: port upgrade harfbuzz 1.4.5 to 1.7.2_0 fails

[MacPorts]

#55507: port upgrade harfbuzz 1.4.5 to 1.7.2_0 fails
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  Reporter:  tomemm    |      Owner:  ryandesign
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.4.2
Resolution:            |   Keywords:  lion
      Port:  harfbuzz  |
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Comment (by ryandesign):

 Ok, I see you're using clang 139 from Xcode 4.0.2. I don't see the problem
 with clang 211 from Xcode 4.2. And on Xcode 3, gcc-4.2 would be used
 instead. We can blacklist old clang versions in the port, and I can file a
 bug report with the developers to see if they want to fix it another way.

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Ticket URL: <https://trac.macports.org/ticket/55507#comment:7>
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