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  \item{what}{character vector or \code{NULL}, specifying
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  \item{what}{character vector or \code{NULL}, specifying
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    required components.  \code{NULL} implies that all are required.}
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    required components.  \code{NULL} implies that all are required.}
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}
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}
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\value{
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\value{
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  A named logical vector. Current components are
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  A named logical vector. Current components are
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    \item{jpeg}{Is the \code{\link{jpeg}} function operational?}
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    \item{jpeg}{Is the \code{\link[graphics]{jpeg}} function operational?}
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    \item{png}{Is the \code{\link{png}} function operational?}
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    \item{png}{Is the \code{\link[graphics]{png}} function operational?}
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    \item{tcltk}{Is the \pkg{tcltk} package operational?}
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    \item{tcltk}{Is the \pkg{tcltk} package operational?}
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    \item{X11}{(Unix)  Are \code{X11} and the data editor available?}
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    \item{X11}{(Unix)  Are \code{X11} and the data editor available?}
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    \item{GNOME}{(Unix)  Is the GNOME GUI in use and are \code{GTK} and
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    \item{GNOME}{(Unix)  Is the GNOME GUI in use and are \code{GTK} and
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      \code{GNOME} graphics devices available?}
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      \code{GNOME} graphics devices available?}
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    \item{libz}{Is \code{\link{gzfile}} available?  From \R 1.5.0 this
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    \item{libz}{Is \code{\link{gzfile}} available?  From \R 1.5.0 this
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      will always be true.}
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      will always be true.}
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    \item{http/ftp}{Are \code{\link{url}} and the internal method for
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    \item{http/ftp}{Are \code{\link{url}} and the internal method for
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      \code{\link{download.file}} available?}
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      \code{\link[utils]{download.file}} available?}
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    \item{sockets}{Are \code{\link{make.socket}} and related functions
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    \item{sockets}{Are \code{\link[utils]{make.socket}} and related functions
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      available?}
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      available?}
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    \item{libxml}{Is there support for integrating \code{libxml} with
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    \item{libxml}{Is there support for integrating \code{libxml} with
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      the \R event loop?}
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      the \R event loop?}
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    \item{cledit}{Is command-line editing available in the current \R
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    \item{cledit}{Is command-line editing available in the current \R
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      session?  This is false in non-interactive sessions.
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      session?  This is false in non-interactive sessions.