[MacPorts] #37427: atlas: Add gcc48 variant

[MacPorts]

#37427: atlas: Add gcc48 variant
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 Reporter:  macsforever2000@…  |      Owner:  vince@…
     Type:  enhancement        |     Status:  new
 Priority:  Normal             |  Milestone:
Component:  ports              |    Version:
 Keywords:                     |       Port:  atlas
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 Please add a gcc48 variant to atlas.

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Ticket URL: <https://trac.macports.org/ticket/37427>
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