[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 haspatch
      Port:  atlas        |
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Comment (by ryandesign@…):

 Oh I do add a dependency. It's just a bit hidden amongst other cleanup of
 the portfile.

 It's not a file ownership issue; it's just a messed-up archive.
 [https://code.google.com/p/libarchive/issues/detail?id=299 This bug
 report] explains what's wrong with the atlas-3.10.1 archive, and also
 suggests a flag we can use to let bsd tar extract it ("`-k`").

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Ticket URL: <https://trac.macports.org/ticket/40685#comment:11>
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