[MacPorts] #40685: atlas: add gnutar dependency

[MacPorts]

#40685: atlas: add gnutar dependency
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  Reporter:  sebastian@…  |      Owner:  vince@…
      Type:  defect       |     Status:  reopened
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.2.0
Resolution:               |   Keywords:  mavericks
      Port:  atlas        |
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Comment (by jmr@…):

 Yeah, I now see that it has a custom extract phase. If bsdtar works too it
 could just call "tar" instead of "gnutar".

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Ticket URL: <https://trac.macports.org/ticket/40685#comment:8>
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