USE Flags explained

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[edit] Introduction

The original list provided at the Gentoo homepage is a rather poor base for making an educated decision on whether you want a particular USE flag or not. The descriptions are much too terse, and don't even provide a link to relevant webpages that could clarify what the USE flag is about. Especially users with little or no Linux background are very much left in the dark. The list below is intended to provide you with links explaining what the respective flag is about.

[edit] ufed

app-portage/ufed (emerge ufed) is a use flag editor. It lists all available USE flags and lets you select which you want easily.

[edit] USE Flags

You can also figure out what a flag is with grep -i ${FLAG} /usr/portage/profiles/use.* or euse -i ${FLAG}

3dfx 
Adds support for 3dfx video cards to Xorg and XFree86
3dnow 
Adds support for 3dnow multimedia processor instructions. It is available for several non-Intel CPUs, most significantly the AMD Athlon. Check out the linked unofficial FAQ for details.
aalib 
Adds support for media-libs/aalib (ASCII-Graphics Library)
accessibility 
Adds support for accessibility (eg 'at-spi' library)
acl 
Adds support for Access Control Lists
acpi 
Adds support for Advanced Configuration and Power Interface
adabas 
Adds support for the Adabas database engine
adns 
Adds support for the adns DNS client library
afs 
AFS is a distributed filesystem product offering a client-server architecture for file sharing, providing location independence, scalability and transparent migration capabilities for data.
aim 
Enable AIM IM protocol support
alsa 
Adds support for alsa-lib. The Advanced Linux Sound Architecture (ALSA) is the de-facto standard for audio and MIDI functionality to the Linux operating system. The user-space alsa-lib simplifies application programming and provides higher level functionality. It also provides the older (deprecated) OSS API, providing binary compatibility for most OSS programs.
altivec 
Adds support for optimizations for G4 and G5/ppc970 processors
apache2 
Chooses Apache2 support when a package supports both Apache1 and Apache2
apm 
Adds APM (Advanced Power Management) support
arts 
Adds support for aRts: the KDE sound daemon
asf 
Enable support for Microsoft ASF (to play WMV/WMA). Currently only xine-lib uses this flag.
atlas 
Adds support for atlas instead of blas in dev-lang/R
audiofile 
Adds support for libaudiofile where applicable. The Audio File Library provides a uniform and elegant API for accessing a variety of audio file formats, such as AIFF/AIFF-C, WAVE, NeXT/Sun .snd/.au, Berkeley/IRCAM/CARL Sound File, Audio Visual Research, Amiga IFF/8SVX, and NIST SPHERE. Supported compression formats are currently G.711 mu-law and A-law and IMA and MS ADPCM.
avi 
Adds Win32 AVI support and also adds avifile (Library for avi) support
bash-completion 
Enables support for tab auto-completion in bash for applications that support it
bcmath 
Adds support for libbcmath, a set of PHP functions for performing arbitrary precision mathematics.
berkdb 
Adds support for sys-libs/db (Berkeley DB for MySQL)
bidi 
Enables bidirectional language support
bindist 
Flag to enable or disable options for prebuilt (GRP) packages (eg. due to licensing issues)
birdstep 
Adds support for the Birdstep Database Server
bonobo 
Adds support for gnome-base/bonobo (Gnome CORBA interfaces)
bootstrap 
 !!internal use only!! DO NOT SET THIS FLAG YOURSELF!, used during original system bootstrapping
build 
 !!internal use only!! DO NOT SET THIS FLAG YOURSELF!, used for creating build images and the first half of bootstrapping.
bzlib 
Use bzlib compression library
calendar 
Adds support for calendars (not using mcal!)
canna 
Adds support for the Canna kana to kanji conversion engine
caps 
Use Linux capabilities library to control privileges.
cdb 
Adds support for the CDB database engine from the author of qmail
cdparanoia 
Enables cdparanoia support
cdr 
Adds support for CD writer hardware (e.g. compile the koncd app in kdemultimedia)
chasen 
Enable chasen support
cjk 
Adds support for Multi-byte character languages (Chinese, Japanese, Korean)
cpdflib 
Adds support for clibpdf
cross 
Enable cross compiler workarounds and patches
crypt 
Add support for encryption -- using mcrypt or gpg where applicable
cscope 
Enables cscope interface -- in vim for example
ctype 
Enables ctype functions
cups 
Add support for CUPS (Common Unix Printing System)
curl 
Adds support for client-side URL transfer library
custom-cflags 
Use CFLAGS from /etc/make.conf rather than the default
curlwrappers 
Adds support for using curl in streams
db2 
Enables support for IBM DB2 database server
dba 
Enables dbm-compatible layers
dbase 
Adds support for dbase file format
dbm 
Adds support for generic DBM databases.
dbmaker 
Adds support for dbmaker database server
dbx 
Adds database abstraction layer
debug 
Tells configure and the makefiles to build for debugging. Effects vary across packages, but generally it will at least add -g to CFLAGS. Remember to set FEATURES=nostrip too
dedicated 
Adds support for dedicated game servers
dga 
Adds DGA Support (Xfree86) (DGA=Direct Graphic Access)
dio 
Adds direct i/o support
directfb 
Adds support for DirectFB layer (library for FB devices)
divx4linux 
Adds support for divx.com's DivX(tm) mpeg4 libary
doc 
Adds extra documentation (API, Javadoc, etc)
dvb 
Adds support for DVB (Digital Video Broadcasting)
dvd 
Adds support for DVDs
dvdr 
Adds support for DVD writer hardware (e.g. in xcdroast)
emacs 
Adds support for GNU Emacs
eds 
Add support for Evolution Data Server in Gaim and OpenOffice. Evolution Data Server is responsible for managing calendar and addressbook information in Gnome.
emacs-w3 
Add support for Emacs/W3 where applicable
empress 
Adds support for the Empress database server
empress-bcs 
Adds local access support for the Empress database server
encode 
Adds support for MEncoder or LaME encoder, wherever applicable
erandom 
Enable erandom/frandom support in glibc for ssp
escreen 
Adds screen support in eterm
esd 
Adds support for media-sound/esound (Enlightened Sound Daemon)
esoob 
Adds support for Easysoft OOD database
ev6 
Assume Alpha processor is EV6 or better
evo 
Adds support for evolution in gnumeric and multisync
exif 
Adds support for reading EXIF headers from JPEG and TIFF images
extensions
Adds 2 extensions (IMQ (intermediate queueing device) target and layer7 matching) to net-firewall/iptables
fam 
Enable FAM support
fastcgi 
Add support for the FastCGI interface
fbcon 
Adds framebuffer support for the console, via the kernel
fdftk 
Add supports for Adobe's FDF toolkit.
fftw 
Use FFTW library for computing Fourier transforms
filepro 
Adds support for filePro databases
firebird 
Adds support for the Firebird relational database
flac 
Adds support for the flac audio codec
flash 
Adds support for creating flash files using Ming
flatfile 
Adds dbm support for flat files
foomaticdb 
Adds support for the foomatic printing driver database
fpx 
Add support for libfpx (FlashPIX Images)
freetds 
Adds support for the TDS protocol to connect to MSSQL/Sybase databases
freewnn 
Adds support for FreeWnn kana to kanji conversion engine
frontbase 
Adds support for the frontbase sql server
ftp 
Adds FTP support
gb 
Adds support for Gnome Basic to gnumeric
gd 
Adds support for media-libs/gd (to generate graphics on the fly)
gd-external 
Use the external version of gd rather than the bundled one (possibly dangerous)
gdbm 
Adds support for sys-libs/gdbm (GNU database libraries)
ggi 
Adds support for media-libs/libggi (non-X video api/drivers)
gif 
Adds GIF image support
ginac 
Adds app-sci/ginac (symbolic math) support
glitz 
Adds glitz (OpenGL) support to the Cairo vector rendering library (used by X and Xgl/Compiz/AIGLX)
glx 
Adds OpenGL extensions support for X.Org
gmp 
Adds support for dev-libs/gmp (GNU MP library)
gnome 
Adds GNOME support
gnutls 
Adds support for net-libs/gnutls which is a TLS 1.0 and SSL 3.0 implementation for the GNU project.
gphoto2 
Adds digital camera support
gpm 
Adds support for sys-libs/gpm (Console-based mouse driver)
graphviz 
Enables graphviz support
gps 
Adds support for Global Positioning System
gstreamer 
Adds support for media-libs/gstreamer (Streaming media)
gtk 
Adds support for x11-libs/gtk+ (The GIMP Toolkit)
gtk2 
Use gtk+-2.x over gtk+-1.2 in cases where a program supports both.
gtkhtml 
Adds support for gnome-extra/gtkhtml
guile 
Adds support for dev-util/guile (interpreter for Scheme)
gimpprint 
Adds CUPS printing support to the image processing software "The GIMP".
hardened 
activate default security enhancements for toolchain (gcc, glibc, binutils)
hardenedphp 
include the hardened php security patch for the php group of ebuilds
hyperwave-api 
Adds support for Hyperwave document storage system
icc 
Add support for the Intel C++ Compiler (does _not_ set $CC)
icc-pgo 
Enable PGO data generation or use when use icc.
iconv 
Enable support for the iconv character set conversion library
icq 
Enable ICQ IM protocol support
ifc 
use ifc instead of g77 to build
imagemagick 
Enables support for Imagemagick (image converter)
imap 
Adds support for IMAP - application layer Internet protocol that allows a local client to access e-mail on a remote server
imlib 
Adds support for media-libs/imlib (Image loading and rendering library)
This library gives (X-only?) apps the ability to recognize and display several image formats. Without it, applications only handle the formats that have been explicitly coded in, or that are supported by another graphics library such as libjpeg. E.g. the window manager IceWm only displays icons in .xpm format, unless imlib is added as a use flag
Even with imlib set, you still have to decide on the flags jpeg, png, gif and tiff use flags because they are important to those apps that don't use imlib but use the individual libraries directly.
immqt, immqt-bc 
QT3 does not have Input Method (IM) functionality, hence to input chinese/japanese/etc, you need to patch QT. See [1] and [2] for starters.
informix 
Adds support for Informix database
ingres 
Adds support for Ingres database
inifile 
Adds dbm support for .ini files
innodb 
Adds innodb support for mySQL (transaction support)
insecure-drivers 
let xorg-x11 compile insecure drivers (for weird stuff like ATi Mach64)
interbase 
Adds support for Interbase database
iodbc 
Adds support for iODBC library
ipv6 
Adds support for IP version 6
jabber 
Enable jabber IM protocol support
jack 
Adds support for the JACK Audio Connection Kit. JACK is a low-latency audio server for professional audio work.
java 
Adds support for Java
jbig 
Add support for the JBIG compression in TIFF image file format - a lossless image compression standard
jikes 
Compile Java source code with jikes (faster)
joystick 
Add support for joysticks in all packages
jpeg 
Adds JPEG image support
junit 
Adds junit awareness -- useful for developers. JUnit is a simple framework to write repeatable unit tests in Java.
kde 
Adds support for kde-base/kde (K Desktop Enviroment)
kdeenablefinal 
Aggregates the source files of a KDE package into one big .cpp before compiling for faster compilation time and better optimizations at the expense of HUGE memory usage at compile-time. Note: setting this flag makes distcc useless during compilations, since it can't distribute a single file over several systems
kdexdelta 
Update KDE without downloading full sources.
kerberos 
Adds kerberos support. Kerberos is a network authentication protocol RFC4120
krb4 
Adds optional kerberos 4 compatibility support
ladcca 
Adds Linux Audio Developer's Configuration and Connection API support (LADCCA)
lcms 
Adds lcms support to media-gfx/imagemagick (Color management)
ldap 
Adds LDAP support (Lightweight Directory Access Protocol)
leim 
Adds input methods support to Emacs
lesstif 
Use lesstif over openmotif in cases where a program supports both
libedit 
Use the libedit library (replacement for readline)
libg++ 
Adds C++ modules in dev-db/postgresql (libpq++)
libgda 
Adds GNU Data Access (CORBA wrapper) support for gnumeric
libwww 
Adds libwww support (General purpose WEB API)
lirc 
Adds support for lirc (Linux's Infra-Red Remote Control)
livecd 
 !!internal use only!! DO NOT SET THIS FLAG YOURSELF!, used during livecd building.
mad 
Adds support for mad (high-quality mp3 decoder library and cli frontend)
maildir 
Adds support for maildir (~/.maildir) style mail spools
mailwrapper 
Adds mailwrapper support to allow multiple MTAs to be installed
matrox 
Adds Matrox MGA support to mplayer
mbox 
Adds support for mbox (/var/spool/mail) style mail spools
mcal 
Adds support for MCAL calender system
mcve 
Support for the MCVE credit card payment system
memlimit 
Adds memory usage limiting in supporting programs
mhash 
Adds support for the mhash library
mikmod 
Adds libmikmod support to allow playing of SoundTracker-style music files
milter 
Adds sendmail mail filter (milter) support
mime 
Adds MIME support. Multipurpose Internet Mail Extensions to support e.g. non-text attachments and multi-part message bodies.
ming 
Adds support for ming library for creating flash format files
mmap 
Adds mmap support
mmx 
Adds support for optimizations for Pentium MMX and Athlon class processors. Multi-Media eXtension, if unsure check /proc/cpuinfo
mng 
Adds support for libmng (MNG images)
mnogosearch 
Adds support for the mnoGoSearch search engine
mono 
Adds support for the MONO framework to certain applications (i.e. DBUS)
motif 
Adds motif support (x11-libs/openmotif x11-libs/lesstif)
motif is another set of GUI conventions alongside GTK, QT and others, and originated in the UNIX world. Unless you used motif applications before and want to hang on to it, you'll generally set this to -motif.
mozilla 
Adds mozilla support
mp3 
Adds mp3 support (needed to play mp3's in packages such as beep-media-player)
mpeg 
Adds libmpeg3 support to various packages. Moving Picture Experts Group.
mpi 
Adds MPI (Message Passing Interface) layer to the apps that support it.
msession 
Adds support for msession daemon
msn 
Enable MSN Messenger IM protocol support
msql 
Adds support for the MSQL database server
mssql 
Adds support for Microsoft SQL Server database
mule 
Adds multi-language support to XEmacs
multilib 
On 64bit systems, if you want to be able to compile 32bit and 64bit binaries
multiuser 
Enable multiuser support by setting correct permissions in app-misc/screen package
mysql 
Adds mySQL support
mysqli 
Adds support for the improved mySQL libraries
nas 
Adds support for network audio sound
ncurses 
Adds ncurses support (console display library)
netcdf 
Enable NetCDF data format support
nethack 
Adds nethack support to screen
nhc98 
Use the nhc98 Haskell compiler instead of GHC if the package supports it
nis 
Support for NIS/YP services. Network Information Service - distributing configuration data on the net.
nls 
Adds Native Language Support (using gettext - GNU locale utilities)
Enable if you want to run applications in a language other than English. I don't think this has an impact on the way applications handle unicode and windows codepages or on the handling of locales (the formatting of dates, times, numbers and monetary units), but feel free to contradict.
nptl 
This flag causes the Native Posix Thread libraries to be built and used. nptl is only compatible with kernel versions 2.6 and higher. See also 'nptlonly'
nptlonly 
The glibc package, when compiled with the nptl USE flag will normally build both the NPTL and pthread versions of the glibc library. This flag causes it to build only the nptl version, and can cause a large speedup in your compile time. Use with kernel version 2.6 and higher only.
nocardbus 
Disables cardbus support in pcmcia-cs
nocd 
Tells emerge to install all files required to run the application without a CD mounted
nsplugin 
Builds plugins for Netscape compatible browsers (Firefox, Opera, Konqueror, etc)
oav 
Adds support for the Open Anti-Virus
oci8 
Adds Oracle 8 Support
odbc 
Adds ODBC Support (Open DataBase Connectivity)
offensive 
Enables potentially offensive items in packages
ogg 
Adds support for the Ogg container format (commonly used by Vorbis, Theora and flac). A patent-free and freely-available encapsulation format for media streams.
openal 
Adds support for the Open Audio Library
opengl 
Adds support for OpenGL. Standard specification for applications that produce 3D computer graphics.
openexr 
Support for the OpenEXR graphics file format
oracle7 
Adds support for Oracle 7
oscar 
Enable Oscar (AIM/ICQ) IM protocol support
oss 
Adds support for OSS (Open Sound System)
For most packages this means that the package can use the Open Sound System for sound input/output (requires kernel support). For the alsa kernel module packages, this means that alsa provides oss emulation for packages that require oss
ovrimos 
Adds support for the Ovrimos Database engine
pam 
Adds support PAM (Pluggable Authentication Modules) - DANGEROUS to arbitrarily flip
pcmcia 
Adds support for PCMCIA slots/devices found on laptop computers
pcntl 
Adds support for process creation functions
pcre 
Adds support for Perl Compatible Regular Expressions
pda 
Adds support for portable devices.
pdflib 
Adds support for PDF (Portable Document Format)
perl 
Adds support/bindings for the Perl language.
pfpro 
Adds support for Verisign Payflow Pro
php 
Include support for php
pic 
Build Position Independent Code. Needed for prelink or the hardened toolchain
pie 
Enable support for Position Independent Executables
plotutils 
Adds plotutils support to gnuplot (library for 2-D vector graphics)
png 
Adds support for libpng (PNG images)
pnp 
Adds support for PNP in pcmcia-cs (Plug-N-Play)
posix 
Adds support for POSIX-compatible functions. Portable Operating System Interface for uniX.
postgres 
Adds support for the postgresql database
ppds 
Adds support for automatically generated ppd (printing driver) files
prelude 
Adds support/bindings for the Prelude Intrusion Detection System
python 
Adds support/bindings for the Python language
qdbm 
Adds support for the qdbm library
qt 
Adds support for Qt, the graphical widget toolkit library used by KDE.
quicktime 
Adds support for OpenQuickTime
readline 
enables support for libreadline, a GNU line-editing library that most everyone wants.
This library gives console and ncurses apps the possibility to allow data entry similar to the bash comand line (with features such as line editing, history, ...). Without it, you won't be able to easily correct typing mistakes.
I guess you'll want it unless
* you either work with extremely limited resources (linux-on-a-floppy)
* or you exclusively use X-enabled apps
recode 
enables support for the GNU recode library. The recode library converts files between character sets and usages.
ruby 
Adds support/bindings for the Ruby language
samba 
Adds support for SAMBA, which provides Windows compatible networking (file and print sharing, etc)
sapdb 
Adds support for SAP DB
sasl 
Adds support for the Simple Authentication and Security Layer
scanner 
Adds support for scanner hardware (e.g. build the sane frontend in kdegraphics)
sdl 
Adds support for Simple Direct Layer (media library)
selinux 
 !!internal use only!! Security Enhanced Linux support, this must be set by the selinux profile or breakage will occur
session 
Adds persistent session support
shared 
Adds support for building shared objects
sharedmem 
Adds support for shared memory use
simplexml 
support for simplexml
slang 
Adds support for the slang text display library (it's like ncurses, but different)
slp 
Adds Service Locator Protocol support to CUPS
snmp 
Adds support for the Simple Network Management Protocol if available
[3] sndfile 
Adds support for libsndfile
soap 
Adds support for SOAP
sockets 
Adds support for tcp/ip sockets
socks5 
Adds support for the socks5 proxy
solid 
Adds support for the Solid database engine
speex 
Adds support for the speex audio codec
spell 
Adds dictionary support
spl 
Adds support for the Standard PHP Library
sqlite 
Adds support for sqlite - embedded sql database
sse 
fast floating point optimization for PentiumIII+ class chips. If unsure check /proc/cpuinfo.
sse2 
fast floating point optimization for Pentium 4/M class chips. If unsure check /proc/cpuinfo.
ssl 
Adds support for Secure Socket Layer connections
static 
 !!do not set this during bootstrap!! Causes things to be statically linked instead of dynamically
svg 
Adds support for SVG (Scalable Vector Graphics)
svga 
Adds support for SVGAlib (graphics library)
sybase 
Adds support for the Sybase SQL Database Server
sybase-ct 
Adds support for Sybase-CT
sysvipc 
Support for System V-compatible inter-process communication
szip 
Use the szip compression library
tcltk 
Support for Tcl and/or Tk
tcpd 
Adds support for TCP wrappers
tetex 
Adds support for teTeX
theora 
Adds support for the Theora Video Compression Codec
threads 
Adds threads support for various packages. Usually pthreads
tidy 
Adds support for HTML Tidy
tiff 
Adds support for the tiff image format
tokenizer 
Adds support for the PHP file parser
truetype 
Adds support for FreeType and/or FreeType2 fonts
trusted 
used by pcmcia-cs to see if a regular user can add and remove pcmcia cards
uclibc 
Enable uclibc specific patches and build or link uclibc
unicode 
Adds support for Unicode
usb 
Adds USB support to applications that have optional USB support (e.g. cups)
userlocales 
Only build certain specified locales (e.g. glibc looks in /etc/locales.build)
vhosts 
Adds support for installing web-based applications into a virtual-hosting environment
videos 
Tells portage to install optional video files (used in some games)
vorbis 
Adds support for the OggVorbis audio codec
voodoo3 
Adds support for 3Dfx's Voodoo3 video chipset, else defaults to Voodoo4/5 support if not in USE.
wavelan 
Tells pcmcia-cs that you want to use the built-in wvlan drivers instead of the Orinoco drivers
wddx 
Adds support for WDDX
wireshark 
Adds support for Wireshark wiretap log support in wifiscanner
wmf 
Adds support for the wmf vector image format
wxwindows 
Adds support for wxWindows/wxGTK
X 
Adds support for optional X11 add-ons within packages. Note that this flag is not required to use the X11 system.
Xaw3d 
Adds support of the 3d athena widget set
xface 
Adds xface support used to allow a small image of xface format to be included in an email via the header 'X-Face'.
xine 
Add support for the XINE movie libraries
xinerama 
Add support for the xinerama X11 extension, which allows you to stretch your display across multiple monitors
xml 
Check/Support flag for XML library (version 1)
xml2 
Check/Support flag for XML library (version 2)
xmlrpc 
Support for xml-rpc library
xosd 
Sends display using the X On Screen Display library
xpm 
Support for XPM graphics format
xprint 
Provide a very advanced print module for Unix/Linux which satisfies all the needs for international printing (including languages and scripts like Arabic, Chinese, Cyrillic, Greek, Hebrew, Indic (Devanagari, Tamil, etc.), Japanese, Korean, Polish, etc.)
xsl 
Check/Support flag for XSL library (version 1)
xv 
Adds in optional support for the Xvideo extension (an X API for video playback)
xvid 
Adds support for xvid.org's open-source mpeg-4 codec
yahoo 
Enable Yahoo Messenger IM protocol support
yaz 
Adds in optional support for the Z39.50 Protocol for Information Retrieval (YAZ)
zeo 
Adds support for Zope Enterprise Objects
zlib 
Adds support for zlib (de)compression
zvbi 
Adds support for the VBI library
VBI (Vertical Blanking Interval) is the timeslot in which your TV reads the broadcast signals for teletext or closed captions. This library adds support for this (requires specific kernel options). If you don't have a TV-card in your PC, and you install any program affected by this flag (unlikely), set it to -zvbi. If you do have a TV card, you'll want +zvbi in order to be able to access teletext/closed caption in e.g. xawtv.
alpha 
indicates that architecture is 64-bit Alpha
amd64 
indicates that architecture is AMD64
arm 
indicates that architecture is ARM
hppa 
indicates that architecture is HP PA-Risc
macos 
indicates that platform is Mac OS (Jaguar, Panther or Tiger)
mips 
indicates that architecture is MIPS based
ppc 
indicates that architecture is PowerPC
ppc64 
indicates that architecture is PowerPC64
sparc 
indicates that architecture is (32-bit) Sparc
x86 
indicates that architecture is x86

[edit] Per package USE flag descriptions

This part will explain what each flag does on per-package basis. Decided to do this for the following reason: from now on, my USE setting in make.conf is -*. Per-package USE flags are added to /etc/portage/package.use. This gave me the idea to actually investigate each flag for the packages I use and store that (useful) data somewhere :) The wiki seemed like a good idea.

--Genia4 18:42, 4 Apr 2005 (GMT)

[edit] media-sound

[edit] media-sound/amarok

flac 
if 'gstreamer' USE flag is set, it emerges 'gst-plugins-flac' so that your gstreamer can play flac files.
mad  
if 'gstreamer' USE flag is set, it emerges 'gst-plugins-mad' so that your gstreamer can play mp3 files.

[edit] media-libs

[edit] media-libs/freetype

bindist 
if 'bindist' USE flag is set, freetype's TrueType bytecode interpreter will be disabled to respect Apple Computer, Inc.'s patents when producing packages for binary distribution. See FreeType and Patents

[edit] media-libs/xine-lib

To be able to play wmv, wma, asf etc, xine needs win32 codecs. Emerge win32codecs and put the USE flags "win32codecs" and "asf" before emerging xine-lib.

[edit] media-tv

[edit] media-tv/mythtv

xvmc

Adds support for X-Video Motion Compensation.

[edit] media-video

[edit] media-video/mplayer

See HOWTO Emerge MPlayer

[edit] media-video/kaffeine

kaffeine is based on the xine libraries, so you need to follow the same procedures.

[edit] media-video/ffmpeg

amr 
Adds support for Adaptive Multi-Rate Audio encoding (required for playing files recorded by many mobile phones)

[edit] x11-terms

[edit] x11-terms/eterm

escreen 
Adds screen support in eterm
etwin 
Adds support for twin in eterm
nethack 
Changes error messages to be styled like the game "nethack".
Retrieved from "http://gentoo-wiki.com/USE_Flags_explained"
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