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  \code{compilePKGS} enables or disables compiling packages when they
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  \code{compilePKGS} enables or disables compiling packages when they
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  are installed.  This requires that the package uses lazy loading as
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  are installed.  This requires that the package uses lazy loading as
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  compilation occurs as functions are written to the lazy loading data
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  compilation occurs as functions are written to the lazy loading data
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  base. This can also be enabled by starting \R with the environment
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  base. This can also be enabled by starting \R with the environment
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  variable \code{_R_COMPILE_PKGS_} set to a positive integer value.
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  variable \env{_R_COMPILE_PKGS_} set to a positive integer value.
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  This should not be enabled outside package installation, because it
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  This should not be enabled outside package installation, because it
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  causes any serialized function to be compiled, which comes with
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  causes any serialized function to be compiled, which comes with
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  time and space overhead. \code{R_COMPILE_PKGS} can be used, instead,
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  time and space overhead. \code{R_COMPILE_PKGS} can be used, instead,
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  to instruct \code{INSTALL} to enable/disable compilation of packages
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  to instruct \code{INSTALL} to enable/disable compilation of packages
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  during installation.
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  during installation.