[MacPorts] #54135: clang-4.0 error building software on 10.6 (or less) due to #include_next <float.h>

[MacPorts]

#54135: clang-4.0 error building software on 10.6 (or less) due to #include_next
<float.h>
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  Reporter:  kencu      |      Owner:  jeremyhu
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:  snowleopard leopard tiger
      Port:  clang-4.0  |
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Comment (by devernay):

 I've been using this patch for weeks to build a full macports + a 600k LOC
 application (Natron). We are even using the OpenMP implementation from
 clang-4.0.

 Note that LLVM 4.0.1 is out

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Ticket URL: <https://trac.macports.org/ticket/54135#comment:14>
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