revdep_check()
.check_cran(pkgs, libpath = file.path(tempdir(), "R-lib"), srcpath = libpath,
bioconductor = FALSE, type = getOption("pkgType"),
threads = getOption("Ncpus", 1), check_dir = tempfile("check_cran"),
env_vars = NULL)
install.packages()
."Ncpus"
or 1
if unset.R CMD check