[MacPorts] #71688: xxhashlib build issue on older Mac Pro

[MacPorts]

#71688: xxhashlib build issue on older Mac Pro
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 Reporter:  aedolphin  |      Owner:  (none)
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.10.5
 Keywords:             |       Port:  xxhashlib
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 I've been refreshing my port installations on an older Mac Pro (Quad-core
 Intel Xeon using El Capitan 10.11.6).  All have worked, except that
 texlive cannot be installed due to one of its dependencies (xxhashlib)
 having build errors ("Failed to build xxhashlib: command execution
 failed").

 There may be a header that cannot be found, as xxhash.h uses
 _mm512_loadu_si512, which does not appear to be found anywhere in the
 package source or system headers.  The log file is attached.

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Ticket URL: <https://trac.macports.org/ticket/71688>
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