[MacPorts] #57960: nghttp2 @1.36.0_0+python27 fails to build on OS X 10.11.6 (El Capitan)

[MacPorts]

#57960: nghttp2 @1.36.0_0+python27 fails to build on OS X 10.11.6 (El Capitan)
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  Reporter:  johnrosshunt  |      Owner:  Schamschula
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.5.4
Resolution:                |   Keywords:  elcapitan
      Port:  nghttp2       |
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Comment (by Schamschula):

 Before I put together a PR I want to know what is really going on. Having
 Travis rebuild numerous times for all OS versions makes no sense to me (as
 I'm still in the dark as what clang versions are at fault).

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Ticket URL: <https://trac.macports.org/ticket/57960#comment:5>
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