1. Suits: R, RTools & Rstudio
2. environment variables:
Modify the variable BINPREF in the file “/R-3.6.0/etc/x64/Makeconf” to “/path/to/Rtools/mingw_64/bin/” to solve a compiling error.
3. configure R environment：~/.Rprofile, R/R-x.x.x/etc/Rprofile.site