[MacPorts] #38820: port atlas fails to upgrade

[MacPorts]

#38820: port atlas fails to upgrade
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  Reporter:  aranoya@…  |      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 vince@…):

 r105342 should disable clang as a possible compiler and reverts default
 choice to gcc47 for all machines. Please test and tell me.

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Ticket URL: <https://trac.macports.org/ticket/38820#comment:13>
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