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USE Flags

Flag	Description	Used in Ebuild(s)
3dfx	Enable support for Voodoo chipsets, also called as 3DFX and TDFX	12
3dnow	Adds support for 3dnow multimedia processor instructions	31
a52	Enables support for decoding ATSC A/52 streams used in DVD	16
aac	Enables support for MPEG-4 AAC Audio	56
aalib	Adds support for media-libs/aalib (ASCII-Graphics Library)	34
accessibility	Adds support for accessibility (eg 'at-spi' library)	25
acl	Adds support for Access Control Lists	95
acpi	Adds support for Advanced Configuration and Power Interface	55
adabas	Adds support for the Adabas database engine	2
adns	Adds support for the adns DNS client library	5
afs	Adds OpenAFS support (distributed file system)	25
aim	Enable AIM IM protocol support	0
alsa	Adds support for media-libs/alsa-lib (Advanced Linux Sound Architecture)	423
altivec	Adds support for optimizations for G4 and G5/ppc970 processors	78
ao	Use libao audio output library for sound playback	26
apache2	Add Apache2 support	42
apm	Adds APM (Advanced Power Management) support	18
aqua	Include support for the Aqua / Carbon GUI	14
arts	Adds support for aRts: the KDE sound daemon	741
atm	Enable Asynchronous Transfer Mode protocol support	25
audiofile	Adds support for libaudiofile where applicable	19
avahi	Add avahi/Zeroconf support	99
bash-completion	Enable bash-completion support	171
bcmath	Adds support for libbcmath	2
berkdb	Adds support for sys-libs/db (Berkeley DB for MySQL)	172
bidi	Enables bidirectional language support	23
bindist	Flag to enable or disable options for prebuilt (GRP) packages (eg. due to licensing issues)	68
birdstep	Adds support for the Birdstep Database Server	2
blas	Adds support for the virtual/blas numerical library	17
bluetooth	Enables Bluetooth Support	76
bootstrap	!!internal use only!! DO NOT SET THIS FLAG YOURSELF!, used during original system bootstrapping [make stage2]	23
boundschecking	Adds the bounds checking patch by Haj Ten Brugge, this will DISABLE the hardened PIE+SSP patches	2
branding	Enable Gentoo specific branding	34
bsf	Enable support for Apache Bean Scripting Framework (dev-java/bsf)	5
build	!!internal use only!! DO NOT SET THIS FLAG YOURSELF!, used for creating build images and the first half of bootstrapping [make stage1]	190
bzip2	Use the bzlib compression library	86
cairo	Enable support for the cairo graphics library	58
calendar	Adds support for calendars (not using mcal!)	9
canna	Adds support for the Canna kana to kanji conversion engine	11
caps	Use Linux capabilities library to control privilege	46
cdb	Adds support for the CDB database engine from the author of qmail	10
cddb	Access cddb servers to retrieve and submit information about compact disks	20
cdinstall	Copies files from the CD rather than asking the user to copy them, mostly used with games	23
cdparanoia	Enables cdparanoia (audio CD ripper) support	13
cdr	Adds support for CD writer hardware	14
cgi	Add CGI script support	28
chasen	Enable chasen (Japanese Morphological Analysis System) support	4
cjk	Adds support for Multi-byte character languages (Chinese, Japanese, Korean)	61
clamav	Adds support for Clam AntiVirus software (usually with a plugin)	30
coreaudio	Build the CoreAudio driver on Mac OS X systems	2
cracklib	Support for cracklib strong password checking	14
crypt	Add support for encryption -- using mcrypt or gpg where applicable	192
cscope	Enables cscope interface -- in vim for example	14
css	Enables ripping of encrypted DVDs	11
ctype	Enables ctype functions	2
cups	Add support for CUPS (Common Unix Printing System)	154
curl	Adds support for client-side URL transfer library	86
curlwrappers	Adds support for using curl in streams	2
custom-cflags	Build with user-specified CFLAGS (unsupported)	49
custom-cxxflags	Build with user-specified CXXFLAGS (unsupported)	27
cvs	Enable CVS (Concurrent Versions System) integration	27
cxx	Builds support for C++ (bindings, extra libraries, code generation, ...)	15
db2	Enables support for IBM DB2 database server	2
dbase	Adds support for dbase file format	2
dbm	Adds support for generic DBM databases	7
dbmaker	Adds support for dbmaker database server	2
dbus	Enable dbus support for anything that needs it (gpsd, gnomemeeting, etc)	221
dbx	Adds database abstraction layer	2
debug	Enable extra debug codepaths, like asserts and extra output. If you want to get meaningful backtraces see http://www.gentoo.org/proj/en/qa/backtraces.xml	4944
dedicated	Adds support for dedicated game servers (some packages do not provide clients and servers at the same time)	126
dga	Adds DGA (Direct Graphic Access) support for X	30
directfb	Adds support for DirectFB layer (library for FB devices)	33
djvu	support DjVu, a PDF-like document format esp. suited for scanned documents	9
doc	Adds extra documentation (API, Javadoc, etc)	3789
dri	Enable direct rendering: used for accelerated 3D and some 2D, like DMA	41
dts	Enables DTS Coherent Acoustics decoder support	10
dv	Enables support for a codec used by many camcorders	20
dvb	Adds support for DVB (Digital Video Broadcasting)	26
dvd	Adds support for DVDs	35
dvdr	Adds support for DVD writer hardware (e.g. in xcdroast)	17
eds	Enables support for Evolution-Data-Server (EDS)	40
emacs	Adds support for GNU Emacs	268
emboss	Adds support for the European Molecular Biology Open Software Suite	11
empress	Adds support for the Empress database server	2
empress-bcs	Adds local access support for the Empress database server	2
encode	Adds support for encoding of audio or video files	44
enscript	Add enscript support to colourize code stored in the repository	6
esd	Adds support for media-sound/esound (Enlightened Sound Daemon)	158
esoob	Adds support for Easysoft OOD database	2
evo	Adds support for mail-client/evolution	13
examples	Install examples, usually source code	915
exif	Adds support for reading EXIF headers from JPEG and TIFF images	56
expat	Enable the use of dev-libs/expat for XML parsing	35
fam	Enable FAM (File Alteration Monitor) support	69
fastcgi	Add support for the FastCGI interface	38
fbcon	Adds framebuffer support for the console, via the kernel	53
ffmpeg	Enable ffmpeg-based audio/video codec support	70
fftw	Use FFTW library for computing Fourier transforms	57
firebird	Adds support for the Firebird relational database	46
firefox	Build against Firefox instead of Seamonkey/Mozilla	19
flac	Adds support for FLAC: Free Lossless Audio Codec	94
flatfile	Adds dbm support for flat files	4
fltk	Adds support for the Fast Light Toolkit gui interface	24
fontconfig	Support for configuring and customizing font access via media-libs/fontconfig	14
foomaticdb	Adds support for the foomatic printing driver database	6
fortran	Adds support for fortran (formerly f77)	48
freetds	Adds support for the TDS protocol to connect to MSSQL/Sybase databases	9
freewnn	Adds support for FreeWnn kana to kanji conversion engine	5
frontbase	Adds support for the frontbase sql server	2
ftp	Adds FTP (File Transfer Protocol) support	11
gcj	Enable building with gcj (The GNU Compiler for the Javatm Programming Language)	11
gd	Adds support for media-libs/gd (to generate graphics on the fly)	47
gd-external	Use the external version of gd rather than the bundled one (possibly dangerous)	2
gdbm	Adds support for sys-libs/gdbm (GNU database libraries)	109
geoip	Add geoip support for country and city lookup based on IPs	24
ggi	Adds support for media-libs/libggi (non-X video api/drivers)	22
gif	Adds GIF image support	67
gimp	Build a plugin for the GIMP	14
ginac	Adds sci-mathematics/ginac (symbolic math) support	5
glut	Build an OpenGL plugin using the GLUT library	4
gmp	Adds support for dev-libs/gmp (GNU MP library)	57
gnome	Adds GNOME support	375
gnome-keyring	Enable support for storing passwords via gnome-keyring	37
gnuplot	Enable support for gnuplot (data and function plotting)	17
gnustep	Adds integration with GNUstep environment	1
gnutls	Adds support for net-libs/gnutls (TLS 1.0 and SSL 3.0 support)	165
gphoto2	Adds digital camera support	19
gpm	Adds support for sys-libs/gpm (Console-based mouse driver)	75
gps	Adds support for Global Positioning System	9
graphviz	Adds support for the Graphviz library	30
gsl	Use the GNU scientific library for calculations	16
gsm	Adds support for the gsm lossy speech compression codec	20
gstreamer	Adds support for media-libs/gstreamer (Streaming media)	70
gtk	Adds support for x11-libs/gtk+ (The GIMP Toolkit)	468
gtkhtml	Adds support for gnome-extra/gtkhtml	17
guile	Adds support for the guile Scheme interpreter	28
gzip	just to commit	39
hal	Enable Hardware Abstraction Layer (HAL) support	173
handbook	Enable handbooks generation for KDE4.	1
hardened	activate default security enhancements for toolchain (gcc, glibc, binutils)	87
hddtemp	Enable monitoring of hdd temperature (app-admin/hddtemp)	12
hdf5	Adds support for the Hierarchical Data Format v5	20
ibm	Add support for IBM ppc64 specific systems	12
iconv	Enable support for the iconv character set conversion library	67
icq	Enable ICQ IM protocol support	0
icu	Enable ICU (Internationalization Components for Unicode) support, using dev-libs/icu	32
idn	Enable support for Internationalized Domain Names	36
ieee1394	Enable FireWire/iLink IEEE1394 support (dv, camera, ...)	21
imagemagick	Enables support for Imagemagick (image converter)	51
imap	Adds support for IMAP (Internet Mail Application Protocol)	23
imlib	Adds support for imlib, an image loading and rendering library	37
inifile	Adds dbm support for .ini files	2
innodb	Adds innodb support for mySQL (transaction support)	1
interbase	Adds support for Interbase database	2
iodbc	Adds support for iODBC library	13
ipod	Enable support for iPod device access	25
ipv6	Adds support for IP version 6	542
jabber	Enable jabber IM protocol support	23
jack	Adds support for the JACK Audio Connection Kit	157
java	Adds support for Java	261
java5	Use Java 1.5 to build package || ( reduced deps, 1.5 features, source/target 1.5 )	19
java6	Use Java 1.6 to build package || ( reduced deps, 1.6 features, source/target 1.6 )	12
javascript	Enables javascript support	14
jbig	enables jbig-kit support for tiff, Hylafax, ImageMagick, etc	12
jingle	Enables voice calls for jabber	15
joystick	Add support for joysticks in all packages	32
jpeg	Adds JPEG image support	249
jpeg2k	Support for JPEG 2000, a wavelet-based image compression format	41
kde	Adds support for kde-base/kde (K Desktop Enviroment)	182
kdeenablefinal	EXPERIMENTAL: KDE ebuilds will use the enable-final flag, yielding compilation speedups at the cost of heavy mem usage and potentially causing problems. We strongly discourage setting this	329
kdehiddenvisibility	Makes KDE symbols hidden by default, requires GCC 4.1 (experimental)	324
kdeprefix	Makes a KDE prefixed install into /usr/kde/$ if enabled or into /usr (FHS compatible) otherwise	289
kerberos	Adds kerberos support	202
kolab	Adds support for the Kolab groupware server	11
kontact	Enable support for the KDE personal information manager (kde-base/kdepim*)	1
krb4	Adds optional kerberos 4 compatibility support	14
ladcca	Adds Linux Audio Developer's Configuration and Connection API support (LADCCA) - DEPRECATED, will be replaced by lash	3
ladspa	Enables the ability to support ladspa plugins	23
lame	Prefer using LAME libraries for MP3 encoding support	24
lapack	Adds support for the virtual/lapack numerical library	23
lash	Adds LASH Audio Session Handler support	13
latex	Adds support for LaTeX (typesetting package)	56
lcms	Adds lcms support (color management engine)	57
ldap	Adds LDAP support (Lightweight Directory Access Protocol)	330
libcaca	Add support for colored ASCII-art graphics	12
libedit	Use the libedit library (replacement for readline)	17
libgda	Adds GNOME Data Access support	9
libnotify	Enable desktop notification support	104
libsamplerate	Build with support for converting sample rates using libsamplerate	37
libwww	Adds libwww support (General purpose WEB API)	13
lirc	Adds support for lirc (Linux's Infra-Red Remote Control)	72
livecd	!!internal use only!! DO NOT SET THIS FLAG YOURSELF!, used during livecd building	13
lm_sensors	Adds linux lm_sensors (hardware sensors) support	21
lua	Enable Lua scripting support	66
lzo	Enables support for lzo compression	17
m17n-lib	Enable m17n-lib support	15
mad	Adds support for mad (high-quality mp3 decoder library and cli frontend)	37
maildir	Adds support for maildir (~/.maildir) style mail spools	13
mailwrapper	Adds mailwrapper support to allow multiple MTAs to be installed	32
matroska	Adds support for the matroska container format (extensions .mkv, .mka and .mks)	13
matrox	Adds Matrox MGA support to mplayer	2
mbox	Adds support for mbox (/var/spool/mail) style mail spools	25
mcve	Support for the MCVE credit card payment system	2
memlimit	Adds memory usage limiting in supporting programs	1
mhash	Adds support for the mhash library	4
migemo	Enables migemo support for Japanese	12
mikmod	Adds libmikmod support to allow playing of SoundTracker-style music files	11
milter	Adds sendmail mail filter (milter) support	6
mime	Adds MIME support	4
minimal	Install a very minimal build (disables, for example, plugins, fonts, most drivers, non-critical features)	317
mmap	Adds mmap (memory map) support	11
mmx	Adds support for optimizations for Pentium MMX and Athlon class processors	158
mng	Adds support for libmng (MNG images)	27
modplug	Adds libmodplug support	16
mono	Build Mono bindings to support dotnet type stuff	32
motif	Adds support for the Motif toolkit	59
mozilla	Adds support for the Mozilla web-browser	20
mp3	Add support for reading mp3 files	88
mpeg	Adds libmpeg3 support to various packages	21
mpi	Adds MPI (Message Passing Interface) layer to the apps that support it	63
mplayer	Enable mplayer support for playback or encoding	22
msn	Enable MSN Messenger IM protocol support	15
msql	Adds support for the MSQL database server	3
mssql	Adds support for Microsoft SQL Server database	25
mtp	Enable support for Media Transfer Protocol	20
mule	Adds multi-language support to XEmacs	2
multilib	On 64bit systems, if you want to be able to compile 32bit and 64bit binaries	46
musepack	Enable support for the musepack audio codec	42
musicbrainz	Lookup audio metadata using MusicBrainz community service (musicbrainz.org)	14
mysql	Adds mySQL Database support	418
mysqli	Adds support for the improved mySQL libraries	6
nas	Adds support for network audio sound	77
ncurses	Adds ncurses support (console display library)	193
netboot	Enables network booting	11
netcdf	Enable NetCDF data format support	9
networkmanager	Enable net-misc/networkmanager support	35
neXt	Enable neXt toolkit	10
nis	Support for NIS/YP services	50
nls	Adds Native Language Support (using gettext - GNU locale utilities)	1306
nntp	Add support for newsgroups (Network News Transfer Protocol)	17
nocd	Install all files required to run the application without a CD mounted	4
nocxx	Disable support for C++ (DON'T USE THIS UNLESS YOU KNOW WHAT YOU'RE DOING)	55
nptl	Enable support for Native POSIX Threads Library, the new threading module (requires linux-2.6 or better usually)	33
nsplugin	Build plugin for browsers supporting the Netscape plugin architecture (that is almost any modern browser)	70
ocaml	Adds support/bindings for the Ocaml language	12
ocamlopt	Enables ocamlopt support (ocaml native code compiler) -- Produces faster programs (Warning: you have to disable/enable it at a global scale)	0
oci8	Adds Oracle 8 Database Support	12
oci8-instant-client	Use dev-db/oracle-instantclient-basic as Oracle provider instead of requiring a full Oracle server install	10
odbc	Adds ODBC Support (Open DataBase Connectivity)	144
offensive	Enables potentially offensive items in packages	17
ofx	Enable support for importing (and exporting) OFX (Open Financial eXchange) data files	16
ogg	Adds support for the Ogg container format (commonly used by Vorbis, Theora and flac)	61
old-linux	Add support for linux-2.4 and older	8
openal	Adds support for the Open Audio Library	25
openexr	Support for the OpenEXR graphics file format	43
opengl	Adds support for OpenGL (3D graphics)	387
openmp	Build support for the OpenMP (support parallel computing), requires >=sys-devel/gcc-4.2 built with USE="openmp"	28
oracle	Enable Oracle Database support	26
osc	Enables support for Open Sound Control	3
oscar	Enable Oscar (AIM/ICQ) IM protocol support	6
oss	Adds support for OSS (Open Sound System)	202
pam	Adds support PAM (Pluggable Authentication Modules) - DANGEROUS to arbitrarily flip	303
pch	Enable precompiled header support for faster compilation at the expense of disk space and memory (>=sys-devel/gcc-3.4 only)	63
pcmcia	Adds support for PCMCIA slots/devices found on laptop computers	16
pcntl	Adds support for process creation functions	2
pcre	Adds support for Perl Compatible Regular Expressions	92
pda	Adds support for portable devices	21
pdf	Adds general support for PDF (Portable Document Format), this replaces the pdflib and cpdflib flags	58
perl	Adds support/bindings for the Perl language	331
php	Include support for the PHP language	34
plasma	Build optional plasma widgets that require kde-base/libplasma	3
plotutils	Add support for plotutils (library for 2-D vector graphics)	9
png	Adds support for libpng (PNG images)	254
policykit	Use sys-auth/policykit to gain privileges	34
portaudio	Adds support for the crossplatform portaudio audio API	16
posix	Adds support for POSIX-compatible functions	2
postgres	Adds support for the postgresql database	346
ppds	Adds support for automatically generated ppd (printing driver) files	11
prefix	Defines if a Gentoo Prefix offset installation is used	0
prelude	Adds support/bindings for the Prelude Intrusion Detection System	15
profile	Adds support for software performance analysis (will likely vary from ebuild to ebuild)	255
pulseaudio	Adds support for PulseAudio sound server	83
python	Adds support/bindings for the Python language	433
qdbm	Adds support for the qdbm (Quick Database Manager) library	7
qmail-spp	Adds support for qmail SMTP plugins	6
qt3	Adds support for the Qt GUI/Application Toolkit version 3.x	103
qt4	Adds support for the Qt GUI/Application Toolkit version 4.x	83
quicktime	Adds support for OpenQuickTime	22
radius	Adds support for RADIUS authentication	31
raw	Add support for raw image formats	13
rdesktop	Adds support for the remote desktop protocol, usually used to connect to Windows servers	9
readline	Enables support for libreadline, a GNU line-editing library that almost everyone wants	244
recode	Enables support for the GNU recode library	4
rss	Enables support for RSS feeds	10
ruby	Adds support/bindings for the Ruby language	91
samba	Adds support for SAMBA (Windows File and Printer sharing)	118
sapdb	Adds support for SAP DB	2
sasl	Adds support for the Simple Authentication and Security Layer	92
savedconfig	Use this to restore your config from /etc/portage/savedconfig $/$. Make sure you USE flags allow for approprate dependencies	23
scanner	Adds support for scanner hardware (e.g. build the sane frontend in kdegraphics)	46
sdl	Adds support for Simple Direct Layer (media library)	158
seamonkey	Adds support for the Seamonkey web-browser	36
selinux	!!internal use only!! Security Enhanced Linux support, this must be set by the selinux profile or breakage will occur	359
semantic-desktop	Cross-KDE support for semantic search and information retrieval	3
session	Adds persistent session support	22
sharedext	Adds support for building shared extensions in PHP	2
sharedmem	Adds support for shared memory use	5
shorten	Adds support for the shorten audio compressor	2
simplexml	support for SimpleXML	2
skey	Enable S/Key (Single use password) authentication support	14
slang	Adds support for the slang text display library (it's like ncurses, but different)	25
slp	Adds Service Locator Protocol support	32
smartcard	Enables smartcard support	18
smp	Enable support for multiprocessors or multicore systems	18
sndfile	Adds support for libsndfile	29
snmp	Adds support for the Simple Network Management Protocol if available	84
soap	Adds support for SOAP (Simple Object Access Protocol)	3
sockets	Adds support for tcp/ip sockets	7
socks5	Adds support for the socks5 proxy	44
solid	Adds support for the Solid database engine	2
source	Zip the sources and install them	759
sox	Adds support for Sound eXchange (SoX)	11
speex	Adds support for the speex audio codec (used for speech)	44
spell	Adds dictionary support	169
spl	Adds support for the Standard PHP Library	2
sqlite	Adds support for sqlite - embedded sql database	192
sqlite3	Adds support for sqlite3 - embedded sql database	55
sse	fast floating point optimization for PentiumIII+ class chips	66
sse2	faster floating point optimization for SSE2 capable chips	55
ssl	Adds support for Secure Socket Layer connections	821
startup-notification	Enable application startup event feedback mechanism	31
static	!!do not set this during bootstrap!! Causes binaries to be statically linked instead of dynamically	441
subversion	Enable subversion (version control system) support	45
suid	Enable setuid root program, with potential security risks	25
svg	Adds support for SVG (Scalable Vector Graphics)	81
svga	Adds support for SVGAlib (graphics library)	66
sybase	Adds support for the Sybase SQL Database Server	4
sybase-ct	Adds support for Sybase-CT	2
symlink	Force kernel ebuilds to automatically update the /usr/src/linux symlink	125
syslog	Enables support for syslog	39
sysvipc	Support for System V-compatible inter-process communication	2
szip	Use the szip compression library	8
taglib	Enable tagging support with taglib	17
tcl	Adds support the Tcl language	126
tcpd	Adds support for TCP wrappers	142
test	Workaround to pull in packages needed to run with FEATURES=test. Portage-2.1.2 handles this internally, so don't set it in make.conf/package.use anymore	894
theora	Adds support for the Theora Video Compression Codec	37
threads	Adds threads support for various packages. Usually pthreads	275
tidy	Adds support for HTML Tidy	9
tiff	Adds support for the TIFF image format	139
timidity	Build with Timidity++ (MIDI sequencer) support	12
tk	Adds support for Tk GUI toolkit	160
tokenizer	Adds support for the PHP file parser	2
truetype	Adds support for FreeType and/or FreeType2 fonts	158
uclibc	Enable uclibc specific patches and build or link uclibc	10
unicode	Adds support for Unicode	202
usb	Adds USB support to applications that have optional USB support (e.g. cups)	117
v4l	Enables video4linux support	52
v4l2	Enable video4linux2 support	28
vanilla	Do not add extra patches which change default behaviour; DO NOT USE THIS ON A GLOBAL SCALE as the severity of the meaning changes drastically	82
vcd	Video CD support	12
vhosts	Adds support for installing web-based applications into a virtual-hosting environment	237
videos	Install optional video files (used in some games)	10
vim-syntax	Pulls in related vim syntax scripts	69
vnc	Enable VNC (remote desktop viewer) support	13
voodoo3	Adds support for 3Dfx's Voodoo3 video chipset, else defaults to Voodoo4/5 support if not in USE	1
vorbis	Adds support for the OggVorbis audio codec	170
wavpack	Add support for wavpack audio compression tools	30
wddx	Adds support for Web Distributed Data eXchange	2
wifi	Enable wireless network functions	13
win32codecs	use win32codecs package for dll avi decoding support (wmv and what not)	13
wmf	Adds support for the Windows Metafile vector image format	21
wxwidgets	Adds support for wxWidgets/wxGTK GUI toolkit	3
wxwindows	Adds support for wxWidgets/wxGTK GUI toolkit (deprecated, use wxwidgets)	37
X	Adds support for X11	877
x264	Enable h264 encoding using x264	22
xattr	Adds support for extended attributes (filesystem-stored metadata)	33
Xaw3d	Adds support for the 3d athena widget set	33
xcb	Support the X C-language Binding, a replacement for Xlib	22
xcomposite	Enable support for the Xorg composite extension	35
xemacs	Add support for XEmacs	17
xface	Adds xface support used to allow a small image of xface format to be included in an email via the header 'X-Face'	13
xft	Build with support for XFT font renderer (x11-libs/libXft)	20
xine	Add support for the XINE movie libraries	29
xinerama	Add support for the xinerama X11 extension, which allows you to stretch your display across multiple monitors	967
xinetd	Add support for the xinetd super-server	60
xml	Add support for XML files	170
xmlrpc	Support for xml-rpc library	8
xosd	Sends display using the X On Screen Display library	14
xpm	Adds support for XPM graphics format	18
xprint	Support for xprint, http://www.mozilla.org/projects/xprint/	8
xscreensaver	Adds support for XScreenSaver extension	30
xsl	Check/Support flag for XSL library (version 1)	2
xulrunner	Build native browser integration against xulrunner instead of firefox or seamonkey	37
xv	Adds in optional support for the Xvideo extension (an X API for video playback)	27
xvid	Adds support for xvid.org's open-source mpeg-4 codec	20
yahoo	Enable Yahoo Messenger IM protocol support	13
yaz	Adds in optional support for the Z39.50 Protocol for Information Retrieval (YAZ)	6
zeroconf	Support for DNS Service Discovery (DNS-SD)	22
zlib	Adds support for zlib (de)compression	287

Local USE Flags