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A general description is here.
‘R CMD build’ now weaves and tangles all vignettes, so suggested packages are not required during package installation if the source tarball was prepared with current ‘R CMD build’.
LaTeX style file ‘upquote.sty’ is no longer included (the version was several years old): it is no longer used in R. A much later version is commonly included in LaTeX distributions but does not play well with the ‘ae’ fonts which are the default for Sweave vignettes.