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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.
R CMD Rd2dvi now gives an explicit error message if latex (or pdflatex) is not available.
R CMD config could echo messages from GNU make if called from within a Makefile (as e.g. package Rcpp does), especially from within a parallel make run.
Runding error could affect window(extend=TRUE) when applied to monthly series. (PR#13272)