Once the driver source code has been downloaded, change the directory to the Avivo source location and generate the program files.
cd xf86-video-avivo/; ./autogen.sh --prefix=/usr/
At the time of writing, the Avivo driver contains support for many different R500 graphics cards from the Mobility FireGL V7200 to the Radeon X1950GT. However, if by chance your PCI ID or graphics card is not listed, new ID entries can be added into xorg/avivo_chipset.c and include/avivo_chipset.h. After making any modifications to the source, build the driver and then install to the system.
make; sudo make install