[MacPorts] #64113: xxhashlib @0.8.1_0: build failure: static_assert undefined

[MacPorts]

#64113: xxhashlib @0.8.1_0: build failure: static_assert undefined
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  Reporter:  macdeport  |      Owner:  Schamschula
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.7.1
Resolution:             |   Keywords:  yosemite
      Port:  xxhashlib  |
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Comment (by ryandesign):

 I didn't have a 10.6 or 10.10 machine handy but I did have a 10.7 machine
 and I was able to reproduce the issue there if I forced the use of
 macports-clang-9.0, which IIRC defaults to C11 mode, so maybe that's
 significant. I was able to build successfully with macports-clang-9.0 by
 adding `-std=c99` to CFLAGS. So this PR should fix the build failure on
 10.6 and might fix it on 10.10 too:

 https://github.com/macports/macports-ports/pull/13233

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Ticket URL: <https://trac.macports.org/ticket/64113#comment:7>
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