R_HOME_USER = ${XDG_DATA_HOME}/r
R_PROFILE_USER = ${XDG_CONFIG_HOME}/r/Rprofile.r
R_MAKEVARS_USER = ${XDG_CONFIG_HOME}/r/Makevars
R_LIBS_USER = ${R_HOME_USER}/x86_64-pc-linux-gnu-library/
# this shouldn't be needed because ESS overrides it
R_HISTFILE = ${XDG_HOME_USER}/session.Rhistory