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  The \R home directory is often referred to as \var{R_HOME},
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  The \R home directory is often referred to as \var{R_HOME},
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  and is the value of an environment variable of that name in an \R
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  and is the value of an environment variable of that name in an \R
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  session.
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  session.
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#ifdef unix
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#ifdef unix
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  It can be found outside an \R session by \code{R \link{RHOME}}.
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  It can be found outside an \R session by \code{R \link{RHOME}}.
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#endif
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#endif
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}
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}
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\value{
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\value{
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  A character string giving the \R home directory or path to a
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  A character string giving the \R home directory or path to a
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  particular component.  Normally the components are all subdirectories
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  particular component.  Normally the components are all subdirectories
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  of the \R home directory, but this may not be the case in a Unix-like
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  of the \R home directory, but this may not be the case in a Unix-like
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  to a sub-architecture-specific location.
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  to a sub-architecture-specific location.
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  The function \code{R.home()} bases the constructed paths on the
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  The function \code{R.home()} bases the constructed paths on the
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  current value of the environment variable \env{R_HOME} which is
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  current value of the environment variable \env{R_HOME} which is
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  normally set on startup.
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  normally set on startup.
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  On Windows the values of \code{R.home()} and \env{R_HOME} are
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  On Windows the values of \code{R.home()} and \env{R_HOME} are
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  guaranteed not to contain spaces, switching to the 8.3 short form of
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  guaranteed not to contain spaces, switching to the 8.3 short form of
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  path elements if required. From \R 2.13.0 the value of \env{R_HOME}
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  path elements if required. From \R 2.13.0 the value of \env{R_HOME}
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  is set on startup to use forward slashes (since many package
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  is set on startup to use forward slashes (since many package
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  maintainers pass it unquoted to shells, for example in Makefiles).
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  maintainers pass it unquoted to shells, for example in Makefiles).