[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>
------------------------+---------------------------------------
  Reporter:  kencu      |      Owner:  jeremyhu
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:  snowleopard leopard tiger
      Port:  clang-4.0  |
------------------------+---------------------------------------

Comment (by kencu):

 I needed to adjust the path a bit, to
 {{{
 --- ./tools/clang/lib/Headers/float.h.orig      2017-05-06
 10:27:32.000000000 -0700
 +++ ./tools/clang/lib/Headers/float.h   2017-05-06 10:28:08.000000000
 -0700
 }}}
 but after that it installed fine. I have clang-4.0 built with this on 10.6
 now, and I'm just running a glib2 build to make sure it works correctly.
 I'll make you a PR for this tomorrow, as I assume that's easier for you.

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Ticket URL: <https://trac.macports.org/ticket/54135#comment:17>
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