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if [ $LIBGL_DRIVERS_PATH ] then if ! set | grep LIBGL_DRIVERS_PATH | grep /usr/lib/xorg/modules/dri/ > /dev/null then LIBGL_DRIVERS_PATH=$LIBGL_DRIVERS_PATH:/usr/lib/xorg/modules/dri/ export LIBGL_DRIVERS_PATH fi else LIBGL_DRIVERS_PATH=/usr/lib/xorg/modules/dri/ export LIBGL_DRIVERS_PATH fi