An error occurred when X is launched with the latest libUMP and sunxi-mali version :
/usr/bin/X: symbol lookup error: /usr/lib/xorg/modules/drivers/fbturbo_drv.so: undefined symbol: SunxiMaliDRI2_Init
- add correct xorg config
- For mali-sunxi driver to work it also need library files from sunxi-mali-dev
package. Adding sunxi-mali-dev to XSERVER force the installation of
the -dev