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  %% even RHEL6 had GNU tar 1.23, Ubuntu 14.04 has 1.27
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  %% even RHEL6 had GNU tar 1.23, Ubuntu 14.04 has 1.27
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  %% macOS has bsdtar from 2010: this supports xz but does not document it.
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  %% macOS has bsdtar from 2010: this supports xz but does not document it.
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  %% bsdtar had lzma/xz support before April 2009 when it added
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  %% bsdtar had lzma/xz support before April 2009 when it added
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  %% support for command-line unxz etc, not just libraries.
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  %% support for command-line unxz etc, not just libraries.
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  \item{support_old_tars}{logical.  If false (the default), the external
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  \item{support_old_tars}{logical.  If false (the default), the external
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    \command{tar} command is assumed to be able handle compressed
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    \command{tar} command is assumed to be able to handle compressed
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    tarfiles and if \code{compressed} does not specify it, to
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    tarfiles and if \code{compressed} does not specify it, to
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    automagically detect the type of compression.  (The major
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    automagically detect the type of compression.  (The major
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    implementations have done so since 2009; for GNU \command{tar} since
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    implementations have done so since 2009; for GNU \command{tar} since
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    version 1.22.)
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    version 1.22.)
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