[MacPorts] #60816: openal-soft build failure on libc++ SnowLeopard: requires cxa_thread_atexit to support thread_local_storage

[MacPorts]

#60816: openal-soft build failure on libc++ SnowLeopard: requires cxa_thread_atexit
to support thread_local_storage
------------------------------+----------------------
  Reporter:  programmingkidx  |      Owner:  kencu
      Type:  defect           |     Status:  assigned
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.6.2
Resolution:                   |   Keywords:
      Port:  libcxx           |
------------------------------+----------------------

Comment (by programmingkidx):

 Your instruction worked :)

 Openal-soft installed. I suggest having this port try to determine if the
 correct version of libcxx is being used.

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Ticket URL: <https://trac.macports.org/ticket/60816#comment:9>
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