[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 ballapete):

 After figuring out that the patch will only be applied to Clang I build
 LLVM first and then studied which patches were applied to Clang. So I
 managed to add the patch to Portfile. Clang built as well.

 It would be easier to work with the pieces if line numbers would be
 displayed or diff output would exist.

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Ticket URL: <https://trac.macports.org/ticket/54135#comment:6>
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