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\value{
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\value{
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  A named character vector, currently with components
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  A named character vector, currently with components
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  \item{zlib}{The version of \code{zlib} in use.}
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  \item{zlib}{The version of \code{zlib} in use.}
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  \item{bzlib}{The version of \code{bzlib} (from \command{bzip2}) in use.}
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  \item{bzlib}{The version of \code{bzlib} (from \command{bzip2}) in use.}
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  \item{xz}{The version of \code{liblzma} (from \command{xz}) in use.}
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  \item{xz}{The version of \code{liblzma} (from \command{xz}) in use.}
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  \item{libdeflate}{The version of \code{libdeflate} (if any otherwise
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  \item{libdeflate}{The version of \code{libdeflate} (if any, otherwise
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    \code{""}) used when \R was built.}
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    \code{""}) used when \R was built.}
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  \item{zstd}{The version of \code{zstd} (from \command{zstd}) in use (if
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  \item{zstd}{The version of \code{libzstd} (from \command{zstd}) in use
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    any, otherwise \code{""}).}
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    (if any, otherwise \code{""}).}
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  \item{PCRE}{The version of \code{PCRE} in use. PCRE1 has versions < 10.00,
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  \item{PCRE}{The version of \code{PCRE} in use. PCRE1 has versions < 10.00,
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    PCRE2 has versions >= 10.00.}
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    PCRE2 has versions >= 10.00.}
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  \item{ICU}{The version of \code{ICU} in use (if any, otherwise \code{""}).}
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  \item{ICU}{The version of \code{ICU} in use (if any, otherwise \code{""}).}
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  \item{TRE}{The version of \code{libtre} in use.}
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  \item{TRE}{The version of \code{libtre} in use.}
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  \item{iconv}{The implementation and version of the \code{iconv}
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  \item{iconv}{The implementation and version of the \code{iconv}
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  Note that the values for \code{bzlib} and \code{pcre} normally contain
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  Note that the values for \code{bzlib} and \code{pcre} normally contain
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  a date as well as the version number, and that for \code{tre} includes
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  a date as well as the version number, and that for \code{tre} includes
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  several items separated by spaces, the version number being the
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  several items separated by spaces, the version number being the
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  second.
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  second.
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  For \code{iconv} this will give the implementation as well as the
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  For \code{\link{iconv}} this will give the implementation as well as the
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  version, for example \code{"GNU libiconv 1.14"}, \code{"glibc
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  version, for example \code{"GNU libiconv 1.14"}, \code{"glibc
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  2.18"} or \code{"win_iconv"} (which has no version number).
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  2.18"} or \code{"win_iconv"} (which has no version number).
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  The name of the binary/executable file for \code{BLAS} can be used as an
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  The name of the binary/executable file for \code{BLAS} can be used as an
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  indication of which implementation is in use.  Typically, the R version of
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  indication of which implementation is in use.  Typically, the R version of