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  environment variables: see Chapter 6 of the \sQuote{R Internals} manual.
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  environment variables: see Chapter 6 of the \sQuote{R Internals} manual.
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  By default \command{R CMD build} uses the \code{"internal"} option to
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  By default \command{R CMD build} uses the \code{"internal"} option to
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  \code{\link{tar}} to prepare the tarball.  An external \command{tar}
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  \code{\link{tar}} to prepare the tarball.  An external \command{tar}
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  program can be specified by the \env{R_BUILD_TAR} environment
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  program can be specified by the \env{R_BUILD_TAR} environment
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  variable.  This will be faster for very large packages, and can be
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  variable.  This may be substantially faster for very large packages,
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  needed for packages with long path names (over 100 bytes) or very
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  and can be needed for packages with long path names (over 100 bytes)
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  large files (over 8GB): however, the resulting tarball may not be
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  or very large files (over 8GB): however, the resulting tarball may not
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  portable.
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  be portable.
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  \command{R CMD check} by default unpacks tarballs by the internal
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  \command{R CMD check} by default unpacks tarballs by the internal
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  \code{\link{untar}} function: if needed an external \command{tar}
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  \code{\link{untar}} function: if needed an external \command{tar}
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  command can be specified by the environment variable
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  command can be specified by the environment variable
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  \env{R_INSTALL_TAR}: please ensure that it can handle the type of
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  \env{R_INSTALL_TAR}: please ensure that it can handle the type of