Those are ATI drivers for XFree 4.3.0 with full Xvideo support.
Don't even bother if your card is not an ATI card.

To see whether you need these drivers, look at the output of
xdpyinfo
xvinfo

If there is no XVideo extension in xdpyinfo, or if xvinfo does not mention
something like:
    Number of image formats: 4
      id: 0x32595559 (YUY2)
        guid: 59555932-0000-0010-8000-00aa00389b71
        bits per pixel: 16
        number of planes: 1
        type: YUV (packed)
      id: 0x59565955 (UYVY)
        guid: 55595659-0000-0010-8000-00aa00389b71
        bits per pixel: 16
        number of planes: 1
        type: YUV (packed)
      id: 0x32315659 (YV12)
        guid: 59563132-0000-0010-8000-00aa00389b71
        bits per pixel: 12
        number of planes: 3
        type: YUV (planar)
      id: 0x30323449 (I420)
        guid: 49343230-0000-0010-8000-00aa00389b71
        bits per pixel: 12
        number of planes: 3
        type: YUV (planar)

you probably need them.

Once the package is installed, just edit your xorg.conf file, to add
${PREFIX}/lib/X11/modules, e.g.,

     ModulePath "${PREFIX}/lib/X11/modules"
     ModulePath "${X11BASE}/lib/modules"