xf86-video-modesetting build steps

sudo apt-get install xutils-dev xorg-dev autoconf automake make libtool libdrm-dev 

git clone git://anongit.freedesktop.org/xorg/driver/xf86-video-modesetting

git checkout -b 0.5.0 xf86-video-modesetting-0.5.0  # use git tag to find out

./autogen --prefix=/usr

make

sudo make install