XBMC is an award winning media center application for Linux, Mac OS X,
Windows and XBox. The ultimate hub for all your media, XBMC is easy to
use, looks slick, and has a large helpful community.  XBMC supports
viewing and playing a vast library of audio, video and image formats.
XBMC has a sophisticated library management system that allows you to
organize all your media to give you quick and immediate access.

XBMC requires libmpeg2, faad2, libmodplug, libmms and enca.

Optional: vobcopy, lirc, faac, cwiid, pybluez, libdvdcss, libssh,
lightblue, libvdpau, libass, rtmpdump, libmicrohttpd, libva, avahi,  
ffmpeg, libdca (aka libdts), a52dec (aka liba52) (all available at 
slackbuilds.org).

Optional: pulseaudio, libcrystalhd and libbluray (not available at 
slackbuilds.org)

Below are some paramaters that can be passed to the slackbuild to turn
on some optional components.

EXT_FFMPEG=yes|no (Default is no), requires ffmpeg
EXT_A52DEC=yes|no (Default is no), requires a52dec
EXT_DTS=yes|no (Default is no), requires libdca
EXT_ALL=yes|no (Default is no), turns on all of the above options
USE_WII=yes|no (Default is no), requires cwiid and pybluez
WEBSERVER=yes|no (Default is no), requires libmicrohttpd