SDL2 and tslib

Hi,
Could some one give me some information how to manage touch screen
input from tslib with sdl2?

With sdl1 I used this configuration:
export TSLIB_TSDEVICE=/dev/input/event0
export TSLIB_TSEVENTTYPE=INPUT
export TSLIB_CONFFILE=/etc/ts.conf
export TSLIB_CALIBFILE=/etc/pointercal
export TSLIB_PLUGINDIR=/usr/lib/ts
export SDL_MOUSEDRV=TSLIB
export SDL_MOUSEDEV=/dev/input/event0
export SDL_NOMOUSE=1

but with SDL2 seems that tslib isn’t implemented, SDL_INPUT_TSLIB
variable and video/fbcon/SDL_fbevents.c there aren’t more…

thank you
Andrea