[MacPorts] #55831: postgis2 fails to compile on Snow Leopard

[MacPorts]

#55831: postgis2 fails to compile on Snow Leopard
-----------------------+-------------------------
  Reporter:  fvaccari  |      Owner:  Veence
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.4.2
Resolution:            |   Keywords:  snowleopard
      Port:  postgis2  |
-----------------------+-------------------------

Comment (by kencu):

 old versions of `gcc` don't have that header, but new versions do, and all
 clangs that we care about should have it too.
 {{{

 $ locate x86intrin.h
 /opt/local/lib/gcc48/gcc/x86_64-apple-darwin10/4.8.5/include/x86intrin.h
 /opt/local/lib/gcc5/gcc/x86_64-apple-darwin10/5.5.0/include/x86intrin.h
 /opt/local/lib/gcc6/gcc/x86_64-apple-darwin10/6.5.0/include/x86intrin.h
 /opt/local/lib/gcc8/gcc/x86_64-apple-darwin10/8.3.0/include/x86intrin.h
 /opt/local/libexec/llvm-3.4/lib/clang/3.4/include/x86intrin.h
 /opt/local/libexec/llvm-3.7/lib/clang/3.7/include/x86intrin.h
 /opt/local/libexec/llvm-3.8/lib/clang/3.8.1/include/x86intrin.h
 /opt/local/libexec/llvm-3.9/lib/clang/3.9.1/include/x86intrin.h
 /opt/local/libexec/llvm-4.0/lib/clang/4.0.1/include/x86intrin.h
 /opt/local/libexec/llvm-5.0/lib/clang/5.0.2/include/x86intrin.h
 /opt/local/libexec/llvm-8.0/lib/clang/8.0.1/include/x86intrin.h
 /opt/local/libexec/llvm-9.0/lib/clang/9.0.0/include/x86intrin.h
 }}}

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Ticket URL: <https://trac.macports.org/ticket/55831#comment:5>
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