[MacPorts] #39065: atlas: build failure on 10.6.8

[MacPorts]

#39065: atlas: build failure on 10.6.8
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  Reporter:  atif.azad@…  |      Owner:  vince@…
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.1.3
Resolution:               |   Keywords:  snowleopard
      Port:  atlas        |
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Comment (by atif.azad@…):

 Replying to [comment:12 vince@…]:
 > Replying to [comment:11 atif.azad@…]:
 > > Unfortunately I can't provide that output until Monday as the problem
 was on ,my office machine. But I appreciate you quickly looking into it.
 > > Thanks very much
 >
 > You’re most welcome. I hope I’ll be able to find an easy workaround
 using the cpufamily ID. Otherwise, I’ll have no choice but disabling AVX
 build on 10.6, which means you would get an halved performance compared to
 what clang delivers.
 > As an immediate workaround, you can rebuild atlas with the +clang33
 option, which should work fine.

 can you please advise on how to use +clang33 option. I don't want to mess
 it up given my little background in changing macport files.
 Thanks

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Ticket URL: <https://trac.macports.org/ticket/39065#comment:14>
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