OPTIONFILE=${OPTIONFILE:-/etc/X11/Xsession.options}
SYSRESOURCES=${SYSRESOURCES:-/etc/X11/Xresources}
USRRESOURCES=${USRRESOURCES:-$HOME/.Xresources}
SYSSESSIONDIR=${SYSSESSIONDIR:-/etc/X11/Xsession.d}
USERXSESSION=${USERXSESSION:-$HOME/.xsession}
USERXSESSIONRC=${USERXSESSIONRC:-$HOME/.xsessionrc}
ALTUSERXSESSION=${ALTUSERXSESSION:-$HOME/.Xsession}
ERRFILE=${ERRFILE:-$HOME/.xsession-errors}