[MacPorts] #56237: Use /usr/bin/gzip to decompress .xz files on macOS >= 10.10

[MacPorts]

#56237: Use /usr/bin/gzip to decompress .xz files on macOS >= 10.10
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  Reporter:  raimue       |      Owner:  (none)
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:  MacPorts Future
 Component:  base         |    Version:
Resolution:               |   Keywords:
      Port:               |
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Comment (by ryandesign):

 xz support is available in 10.9 and later, isn't it?

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Ticket URL: <https://trac.macports.org/ticket/56237#comment:1>
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