[MacPorts] #39030: upgrade outdated fails (due to atlas upgrade problem) on OSX 10.6.8

[MacPorts]

#39030: upgrade outdated fails (due to atlas upgrade problem) on OSX 10.6.8
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  Reporter:  joel@…  |      Owner:  vince@…
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.1.3
Resolution:          |   Keywords:
      Port:  atlas   |
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Comment (by joel@…):

 #39065 states "As an immediate workaround, you can rebuild atlas with the
 +clang33 option, which should work fine."

 I'd like to try this, but I'm not sure what command I should run. I tried
 "sudo port upgrade atlas +clang33", but got an error. Before I risk
 mucking anything else up, I thought I'd ask how to rebuild atlas
 correctly.

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Ticket URL: <https://trac.macports.org/ticket/39030#comment:6>
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