Nothing
R_USER_CACHE_DIR<-tempfile()
dir.create(R_USER_CACHE_DIR)
Sys.setenv("R_USER_CACHE_DIR"=R_USER_CACHE_DIR)
r_version <- R.Version()$version.string
is_rdevel <- grepl("unstable", r_version)
# is_debian <- grepl("debian", tolower(Sys.info()['release']))
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