#18236: support xz compressed tarballs
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       Reporter:  rws          |        Owner:
           Type:  enhancement  |       Status:  new
       Priority:  major        |    Milestone:  sage-6.7
      Component:  build        |   Resolution:
       Keywords:               |    Merged in:
        Authors:               |    Reviewers:
Report Upstream:  N/A          |  Work issues:
         Branch:               |       Commit:
   Dependencies:               |     Stopgaps:
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Comment (by fbissey):

 `-J`  is the right option for `.xz` I am not sure what is happening
 internally but `-a` smartly identify the compression and applies the right
 filter if available. The big problem is that you need a GNU tar recent
 enough to support xz and that xz is present. I am not sure that BSD tar
 shipped with OS X supports it at all, or even if xz/lzma is present. I can
 check though.

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Ticket URL: <http://trac.sagemath.org/ticket/18236#comment:1>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
and MATLAB

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