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A general description is here.
‘R CMD INSTALL’ will now no longer install certain file types from ‘inst/doc’: these are almost certainly mistakes and for some packages are wasting a lot of space. These are ‘Makefile’, files generated by running LaTeX, and unless the package uses a ‘vignettes’ directory, PostScript and image bitmap files.
Note that only PDF vignettes have ever been supported: some of these files come from DVI/PS output from the Sweave defaults prior to R 2.13.0.