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A general description is here.
R_PDFLATEXCMD is added to the environment variables set by 'R CMD' and is used by R CMD Rd2dvi.
d2dvi now gives an explicit error message if latex (or pdflatex) is not available
R CMD Rd2dvi now gives an explicit error message if latex (or pdflatex) fails.
Offline help on a Unix-alike now works even if options "latexcmd" and "dvipscmd" contain spaces (e.g. "dvips -Pmy_printer").
Informative error messages are given if running latex or dvips fail.