[MacPorts] #39030: upgrade outdated fails (due to atlas upgrade problem) on OSX 10.6.8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#39030: upgrade outdated fails (due to atlas upgrade problem) on OSX 10.6.8
---------------------+---------------------
  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 macsforever2000@…):

 You might have to clean it first. Also it is easier to simply install it:

 {{{
 sudo port clean atlas
 sudo port install atlas +mpclang33
 }}}

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Ticket URL: <https://trac.macports.org/ticket/39030#comment:8>
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