These ebuilds come from http://github.com/sjnewbury/multilib-overlay.
If you have some problems, go to the official site first.
a52dec : library for decoding ATSC A/52 streams used in DVD ( http://liba52.sourceforge.net/ )
aalib : A ASCII-Graphics Library ( http://aa-project.sourceforge.net/aalib/ )
alsa-lib : Advanced Linux Sound Architecture Library ( http://www.alsa-project.org/ )
audiofile : An elegant API for accessing audio files ( http://www.68k.org/~michael/audiofile/ )
babl : A dynamic, any to any, pixel format conversion library ( http://www.gegl.org/babl/ )
exempi : Exempi is a port of the Adobe XMP SDK to work on UNIX ( http://libopenraw.freedesktop.org/wiki/Exempi )
faac : Free MPEG-4 audio codecs by AudioCoding.com ( http://www.audiocoding.com )
faad2 : AAC audio decoding library ( http://www.audiocoding.com/faad2.html )
flac : free lossless audio encoder and decoder ( http://flac.sourceforge.net )
fontconfig : A library for configuring and customizing font access ( http://fontconfig.org/ )
freealut : The OpenAL Utility Toolkit ( http://www.openal.org/ )
freeglut : A completely OpenSourced alternative to the OpenGL Utility Toolkit (GLUT) library ( http://freeglut.sourceforge.net/ )
freetype : A high-quality and portable font engine ( http://www.freetype.org/ )
ftgl : library to use arbitrary fonts in OpenGL applications ( http://ftgl.wiki.sourceforge.net/ )
gd : A graphics library for fast image creation ( http://libgd.org/ )
gegl : A graph based image processing framework ( http://www.gegl.org/ )
giflib : Library to handle, display and manipulate GIF images ( http://sourceforge.net/projects/giflib/ )
glew : The OpenGL Extension Wrangler Library ( http://glew.sourceforge.net/ )
glitz : An OpenGL image compositing library ( http://www.freedesktop.org/Software/glitz )
gst-plugins-base : Basepack of plugins for gstreamer ( http://gstreamer.sourceforge.net )
gstreamer : Streaming media framework ( http://gstreamer.sourceforge.net )
id3lib : Id3 library for C/C++ ( http://id3lib.sourceforge.net/ )
ilmbase : OpenEXR ILM Base libraries ( http://openexr.com/ )
imlib2 : Version 2 of an advanced replacement library for libraries like libXpm ( http://www.enlightenment.org/ )
jasper : software-based implementation of the codec specified in the JPEG-2000 Part-1 standard ( http://www.ece.uvic.ca/~mdadams/jasper/ )
jbigkit : data compression algorithm for bi-level high-resolution images ( http://www.cl.cam.ac.uk/~mgk25/jbigkit/ )
jpeg : Library to load, handle and manipulate images in the JPEG format ( http://jpegclub.org/ http://www.ijg.org/ )
lasi : C++ library for postscript stream output ( http://www.unifont.org/lasi/ )
lcms : A lightweight, speed optimized color management engine ( http://www.littlecms.com/ )
libart_lgpl : a LGPL version of libart ( http://www.levien.com/libart )
libcaca : A library that creates colored ASCII-art graphics ( http://libcaca.zoy.org/ )
libcanberra : Portable Sound Event Library ( http://0pointer.de/lennart/projects/libcanberra/ )
libcddb : A library for accessing a CDDB server ( http://libcddb.sourceforge.net )
libcuefile : Cue File library from Musepack ( http://www.musepack.net )
libdc1394 : Library to interface with IEEE 1394 cameras following the IIDC specification ( http://sourceforge.net/projects/libdc1394/ )
libdca : library for decoding DTS Coherent Acoustics streams used in DVD ( http://www.videolan.org/developers/libdca.html )
libdv : Software codec for dv-format video (camcorders etc) ( http://libdv.sourceforge.net/ )
libdvdcss : A portable abstraction library for DVD decryption ( http://www.videolan.org/developers/libdvdcss.html )
libexif : Library for parsing, editing, and saving EXIF data ( http://libexif.sourceforge.net/ )
libfpx : A library for manipulating FlashPIX images ( http://www.i3a.org/ )
libggi : Fast and safe graphics and drivers for about any graphics card to the Linux kernel (sometimes) ( http://www.ggi-project.org )
libgii : Fast and safe graphics and drivers for about any graphics card to the Linux kernel (sometimes) ( http://www.ggi-project.org )
libgphoto2 : Library that implements support for numerous digital cameras ( http://www.gphoto.org/ )
libid3tag : The MAD id3tag library ( http://www.underbit.com/products/mad/ )
libiptcdata : library for manipulating the International Press Telecommunication ( http://libiptcdata.sourceforge.net )
libmad : \"M\"peg \"A\"udio \"D\"ecoder library ( http://mad.sourceforge.net )
libmikmod : A library to play a wide range of module formats ( http://mikmod.raphnet.net/ )
libmng : Multiple Image Networkgraphics lib (animated png's) ( http://www.libmng.com/ )
libmodplug : Library for playing MOD-like music files ( http://modplug-xmms.sourceforge.net/ )
libmp4v2 : Functions for accessing ISO-IEC:14496-1:2001 MPEG-4 standard ( http://code.google.com/p/mp4v2 )
libreplaygain : Replay Gain library from Musepack ( http://www.musepack.net )
libsamplerate : Secret Rabbit Code (aka libsamplerate) is a Sample Rate Converter for audio ( http://www.mega-nerd.com/SRC/ )
libsdl : Simple Direct Media Layer ( http://www.libsdl.org/ )
libsndfile : A C library for reading and writing files containing sampled sound ( http://www.mega-nerd.com/libsndfile )
libtheora : The Theora Video Compression Codec ( http://www.theora.org )
libv4l : Separate libraries ebuild from upstream v4l-utils package ( http://git.linuxtv.org/v4l-utils.git )
libvorbis : The Ogg Vorbis sound file format library ( http://xiph.org/vorbis )
libwmf : library for converting WMF files ( http://wvware.sourceforge.net/ )
mesa : OpenGL-like graphic library for Linux ( http://mesa3d.sourceforge.net/ )
nas : Network Audio System ( http://radscan.com/nas.html )
openal : A software implementation of the OpenAL 3D audio API ( http://kcat.strangesoft.net/openal.html )
opencore-amr : Implementation of Adaptive Multi Rate Narrowband and Wideband speech codec ( http://opencore-amr.sourceforge.net/ )
openexr : ILM's OpenEXR high dynamic-range image file format libraries ( http://openexr.com/ )
openjpeg : An open-source JPEG 2000 codec written in C ( http://www.openjpeg.org/ )
schroedinger : C-based libraries for the Dirac video codec ( http://www.diracvideo.org/ )
sdl-image : image file loading library ( http://www.libsdl.org/projects/SDL_image/ )
sdl-mixer : Simple Direct Media Layer Mixer Library ( http://www.libsdl.org/projects/SDL_mixer/ )
sdl-net : Simple Direct Media Layer Network Support Library ( http://www.libsdl.org/projects/SDL_net/index.html )
sdl-ttf : library that allows you to use TrueType fonts in SDL applications ( http://www.libsdl.org/projects/SDL_ttf/ )
smpeg : SDL MPEG Player Library ( http://www.lokigames.com/development/smpeg.php3 )
speex : Audio compression format designed for speech. ( http://www.speex.org )
tiff : Library for manipulation of TIFF (Tag Image File Format) images ( http://www.remotesensing.org/libtiff/ )
x264 : A free library for encoding X264/AVC streams ( http://www.videolan.org/developers/x264.html )
xine-lib : Core libraries for Xine movie player ( http://xine.sourceforge.net )
xvid : XviD, a high performance/quality MPEG-4 video de-/encoding solution ( http://www.xvid.org/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a multilib
For Paludis use this rsync : rsync://gentoo.zugaina.org/multilib-portage
If you have a problem : ycarus(-at-)zugaina.org