[MacPorts] #52606: atlas: add gcc6 variant.

[MacPorts]

#52606: atlas: add gcc6 variant.
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  Reporter:  Schamschula  |      Owner:  Veence
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:  haspatch
      Port:  atlas        |
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Comment (by Schamschula):

 Any news?

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Ticket URL: <https://trac.macports.org/ticket/52606#comment:5>
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