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USE Flags

Flag	Description	Used in Ebuild(s)
3dfx	Enable support for Voodoo chipsets, also called as 3DFX and TDFX	22
3dnow	Adds support for 3dnow multimedia processor instructions	129
a52	Enables support for decoding ATSC A/52 streams used in DVD	39
aac	Enables support for MPEG-4 AAC Audio	162
aalib	Adds support for media-libs/aalib (ASCII-Graphics Library)	108
accessibility	Adds support for accessibility (eg 'at-spi' library)	88
acl	Adds support for Access Control Lists	251
acpi	Adds support for Advanced Configuration and Power Interface	150
adabas	Adds support for the Adabas database engine	15
adns	Adds support for the adns DNS client library	33
afs	Adds OpenAFS support (distributed file system)	58
aim	Enable AIM IM protocol support	1
alsa	Adds support for media-libs/alsa-lib (Advanced Linux Sound Architecture)	1283
altivec	Adds support for optimizations for G4 and G5/ppc970 processors	431
ao	Use libao audio output library for sound playback	71
apache2	Add Apache2 support	100
apm	Adds APM (Advanced Power Management) support	45
aqua	Include support for the Aqua / Carbon GUI	4313
atm	Enable Asynchronous Transfer Mode protocol support	43
audiofile	Adds support for libaudiofile where applicable	40
avahi	Add avahi/Zeroconf support	282
bash-completion	Enable bash-completion support	583
bcmath	Adds support for libbcmath	15
berkdb	Adds support for sys-libs/db (Berkeley DB for MySQL)	386
bidi	Enables bidirectional language support	69
bindist	Flag to enable or disable options for prebuilt (GRP) packages (eg. due to licensing issues)	208
birdstep	Adds support for the Birdstep Database Server	15
blas	Adds support for the virtual/blas numerical library	29
bluetooth	Enables Bluetooth Support	264
bootstrap	!!internal use only!! DO NOT SET THIS FLAG YOURSELF!, used during original system bootstrapping [make stage2]	211
boundschecking	Adds the bounds checking patch by Haj Ten Brugge, this will DISABLE the hardened PIE+SSP patches	7
branding	Enable Gentoo specific branding	55
bsf	Enable support for Apache Bean Scripting Framework (dev-java/bsf)	8
build	!!internal use only!! DO NOT SET THIS FLAG YOURSELF!, used for creating build images and the first half of bootstrapping [make stage1]	1049
bzip2	Use the bzlib compression library	277
cairo	Enable support for the cairo graphics library	202
calendar	Adds support for calendars (not using mcal!)	33
canna	Adds support for the Canna kana to kanji conversion engine	25
caps	Use Linux capabilities library to control privilege	223
cdb	Adds support for the CDB database engine from the author of qmail	42
cdda	Adds Compact Disk Digital Audio (Standard Audio CD) support	72
cddb	Access cddb servers to retrieve and submit information about compact disks	60
cdinstall	Copies files from the CD rather than asking the user to copy them, mostly used with games	64
cdparanoia	Enables cdparanoia (audio CD ripper) support	41
cdr	Adds support for CD writer hardware	45
cgi	Add CGI script support	66
chasen	Enable chasen (Japanese Morphological Analysis System) support	9
cjk	Adds support for Multi-byte character languages (Chinese, Japanese, Korean)	136
clamav	Adds support for Clam AntiVirus software (usually with a plugin)	38
coreaudio	Build the CoreAudio driver on Mac OS X systems	29
cracklib	Support for cracklib strong password checking	43
crypt	Add support for encryption -- using mcrypt or gpg where applicable	500
cscope	Enables cscope interface -- in vim for example	28
css	Enables reading of encrypted DVDs	22
ctype	Enables ctype functions	9
cups	Add support for CUPS (Common Unix Printing System)	469
curl	Adds support for client-side URL transfer library	284
curlwrappers	Adds support for using curl in streams	13
custom-cflags	Build with user-specified CFLAGS (unsupported)	358
cvs	Enable CVS (Concurrent Versions System) integration	66
cxx	Builds support for C++ (bindings, extra libraries, code generation, ...)	76
db2	Enables support for IBM DB2 database server	18
dbase	Adds support for dbase file format	13
dbi	Enable dev-db/libdbi (database-independent abstraction layer) support	41
dbm	Adds support for generic DBM databases	16
dbmaker	Adds support for dbmaker database server	15
dbus	Enable dbus support for anything that needs it (gpsd, gnomemeeting, etc)	867
dbx	Adds database abstraction layer	13
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	13797
dedicated	Adds support for dedicated game servers (some packages do not provide clients and servers at the same time)	354
dga	Adds DGA (Direct Graphic Access) support for X	88
directfb	Adds support for DirectFB layer (library for FB devices)	159
djvu	support DjVu, a PDF-like document format esp. suited for scanned documents	46
doc	Adds extra documentation (API, Javadoc, etc)	11987
dri	Enable direct rendering: used for accelerated 3D and some 2D, like DMA	54
dts	Enables DTS Coherent Acoustics decoder support	25
dv	Enables support for a codec used by many camcorders	54
dvb	Adds support for DVB (Digital Video Broadcasting)	68
dvd	Adds support for DVDs	64
dvdr	Adds support for DVD writer hardware (e.g. in xcdroast)	31
eds	Enables support for Evolution-Data-Server (EDS)	141
emacs	Adds support for GNU Emacs	554
emboss	Adds support for the European Molecular Biology Open Software Suite	24
empress	Adds support for the Empress database server	15
empress-bcs	Adds local access support for the Empress database server	15
encode	Adds support for encoding of audio or video files	69
enscript	Add enscript support to colourize code stored in the repository	16
esd	Adds support for media-sound/esound (Enlightened Sound Daemon)	487
esoob	Adds support for Easysoft OOD database	15
evo	Adds support for mail-client/evolution	32
examples	Install examples, usually source code	2677
exif	Adds support for reading EXIF headers from JPEG and TIFF images	185
expat	Enable the use of dev-libs/expat for XML parsing	92
fam	Enable FAM (File Alteration Monitor) support	181
fastcgi	Add support for the FastCGI interface	75
fbcon	Adds framebuffer support for the console, via the kernel	182
ffmpeg	Enable ffmpeg-based audio/video codec support	318
fftw	Use FFTW library for computing Fourier transforms	159
firebird	Adds support for the Firebird relational database	117
firefox	Build against Firefox instead of Seamonkey/Mozilla	22
flac	Adds support for FLAC: Free Lossless Audio Codec	339
flatfile	Adds dbm support for flat files	17
fltk	Adds support for the Fast Light Toolkit gui interface	59
fontconfig	Support for configuring and customizing font access via media-libs/fontconfig	100
foomaticdb	Adds support for the foomatic printing driver database	19
fortran	Adds support for fortran (formerly f77)	277
freetds	Adds support for the TDS protocol to connect to MSSQL/Sybase databases	44
freewnn	Adds support for FreeWnn kana to kanji conversion engine	15
frontbase	Adds support for the frontbase sql server	15
ftp	Adds FTP (File Transfer Protocol) support	70
gcj	Enable building with gcj (The GNU Compiler for the Javatm Programming Language)	209
gd	Adds support for media-libs/gd (to generate graphics on the fly)	115
gd-external	Use the external version of gd rather than the bundled one (possibly dangerous)	15
gdbm	Adds support for sys-libs/gdbm (GNU database libraries)	267
geoip	Add geoip support for country and city lookup based on IPs	73
ggi	Adds support for media-libs/libggi (non-X video api/drivers)	79
gif	Adds GIF image support	211
gimp	Build a plugin for the GIMP	50
ginac	Adds sci-mathematics/ginac (symbolic math) support	4
glut	Build an OpenGL plugin using the GLUT library	27
gmp	Adds support for dev-libs/gmp (GNU MP library)	135
gnome	Adds GNOME support	1075
gnome-keyring	Enable support for storing passwords via gnome-keyring	163
gnuplot	Enable support for gnuplot (data and function plotting)	40
gnustep	Adds integration with GNUstep environment	8
gnutls	Adds support for net-libs/gnutls (TLS 1.0 and SSL 3.0 support)	561
gphoto2	Adds digital camera support	109
gpm	Adds support for sys-libs/gpm (Console-based mouse driver)	181
gps	Adds support for Global Positioning System	49
graphviz	Adds support for the Graphviz library	129
gsl	Use the GNU scientific library for calculations	53
gsm	Adds support for the gsm lossy speech compression codec	149
gstreamer	Adds support for media-libs/gstreamer (Streaming media)	292
gtk	Adds support for x11-libs/gtk+ (The GIMP Toolkit)	1399
gtkhtml	Adds support for gnome-extra/gtkhtml	33
guile	Adds support for the guile Scheme interpreter	80
gzip	Compress files with Lempel-Ziv coding (LZ77)	279
hal	Enable Hardware Abstraction Layer (HAL) support	440
handbook	Enable handbooks generation for KDE4.	13
hardened	activate default security enhancements for toolchain (gcc, glibc, binutils)	415
hddtemp	Enable monitoring of hdd temperature (app-admin/hddtemp)	25
hdf5	Adds support for the Hierarchical Data Format v5	38
ibm	Add support for IBM ppc64 specific systems	45
iconv	Enable support for the iconv character set conversion library	210
icq	Enable ICQ IM protocol support	8
icu	Enable ICU (Internationalization Components for Unicode) support, using dev-libs/icu	102
idn	Enable support for Internationalized Domain Names	145
ieee1394	Enable FireWire/iLink IEEE1394 support (dv, camera, ...)	111
imagemagick	Enables support for Imagemagick (image converter)	130
imap	Adds support for IMAP (Internet Mail Application Protocol)	62
imlib	Adds support for imlib, an image loading and rendering library	80
inifile	Adds dbm support for .ini files	15
innodb	Adds innodb support for mySQL (transaction support)	3
interbase	Adds support for Interbase database	17
iodbc	Adds support for iODBC library	55
ipod	Enable support for iPod device access	73
ipv6	Adds support for IP version 6	1559
jabber	Enable jabber IM protocol support	88
jack	Adds support for the JACK Audio Connection Kit	644
java	Adds support for Java	734
java6	Use Java 1.6 to build package with || ( reduced deps, 1.6 features, source/target 1.6 )	14
javascript	Enables javascript support	49
jbig	enables jbig-kit support for tiff, Hylafax, ImageMagick, etc	36
jingle	Enables voice calls for jabber	36
joystick	Add support for joysticks in all packages	112
jpeg	Adds JPEG image support	802
jpeg2k	Support for JPEG 2000, a wavelet-based image compression format	177
kde	Adds support for kde-base/kde (K Desktop Enviroment)	459
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	2976
kdeprefix	Makes a KDE prefixed install into /usr/kde/$ if enabled or into /usr (FHS compatible) otherwise	1869
kerberos	Adds kerberos support	578
kolab	Adds support for the Kolab groupware server	24
kontact	Enable support for the KDE personal information manager (kde-base/kdepim*)	9
ladspa	Enables the ability to support ladspa plugins	101
lame	Prefer using LAME libraries for MP3 encoding support	73
lapack	Adds support for the virtual/lapack numerical library	56
lash	Adds LASH Audio Session Handler support	68
latex	Adds support for LaTeX (typesetting package)	233
lcms	Adds lcms support (color management engine)	241
ldap	Adds LDAP support (Lightweight Directory Access Protocol)	1091
libcaca	Add support for colored ASCII-art graphics	66
libedit	Use the libedit library (replacement for readline)	76
libgda	Adds GNOME Data Access support	19
libnotify	Enable desktop notification support	413
libsamplerate	Build with support for converting sample rates using libsamplerate	117
libwww	Adds libwww support (General purpose WEB API)	35
lirc	Adds support for lirc (Linux's Infra-Red Remote Control)	210
livecd	!!internal use only!! DO NOT SET THIS FLAG YOURSELF!, used during livecd building	41
lm_sensors	Adds linux lm_sensors (hardware sensors) support	46
lua	Enable Lua scripting support	216
lzo	Enables support for lzo compression	98
m17n-lib	Enable m17n-lib support	32
mad	Adds support for mad (high-quality mp3 decoder library and cli frontend)	172
maildir	Adds support for maildir (~/.maildir) style mail spools	41
mailwrapper	Adds mailwrapper support to allow multiple MTAs to be installed	67
matroska	Adds support for the matroska container format (extensions .mkv, .mka and .mks)	51
matrox	Adds Matrox MGA support to mplayer	4
mbox	Adds support for mbox (/var/spool/mail) style mail spools	82
mcve	Support for the MCVE credit card payment system	12
memlimit	Adds memory usage limiting in supporting programs	4
mhash	Adds support for the mhash library	22
migemo	Enables migemo support for Japanese	26
mikmod	Adds libmikmod support to allow playing of SoundTracker-style music files	44
milter	Adds sendmail mail filter (milter) support	23
mime	Adds MIME support	8
minimal	Install a very minimal build (disables, for example, plugins, fonts, most drivers, non-critical features)	760
mmap	Adds mmap (memory map) support	23
mmx	Adds support for optimizations for Pentium MMX and Athlon class processors	472
mng	Adds support for libmng (MNG images)	105
modplug	Adds libmodplug support	60
modules	Build the kernel modules	42
mono	Build Mono bindings to support dotnet type stuff	95
motif	Adds support for the Motif toolkit	110
mozilla	Adds support for the Mozilla web-browser	26
mp3	Add support for reading mp3 files	355
mp4	Support for MP4 container format	36
mpeg	Adds libmpeg3 support to various packages	67
mpi	Adds MPI (Message Passing Interface) layer to the apps that support it	186
mplayer	Enable mplayer support for playback or encoding	75
msn	Enable MSN Messenger IM protocol support	52
msql	Adds support for the MSQL database server	14
mssql	Adds support for Microsoft SQL Server database	67
mtp	Enable support for Media Transfer Protocol	60
mule	Adds multi-language support to XEmacs	9
multilib	On 64bit systems, if you want to be able to compile 32bit and 64bit binaries	370
musepack	Enable support for the musepack audio codec	107
musicbrainz	Lookup audio metadata using MusicBrainz community service (musicbrainz.org)	54
mysql	Adds mySQL Database support	1144
mysqli	Adds support for the improved mySQL libraries	22
nas	Adds support for network audio sound	331
ncurses	Adds ncurses support (console display library)	647
netboot	Enables network booting	27
netcdf	Enable NetCDF data format support	19
networkmanager	Enable net-misc/networkmanager support	162
neXt	Enable neXt toolkit	14
nis	Support for NIS/YP services	116
nls	Adds Native Language Support (using gettext - GNU locale utilities)	4009
nntp	Add support for newsgroups (Network News Transfer Protocol)	77
nocd	Install all files required to run the application without a CD mounted	9
nocxx	Disable support for C++ (DON'T USE THIS UNLESS YOU KNOW WHAT YOU'RE DOING)	312
nptl	Enable support for Native POSIX Threads Library, the new threading module (requires linux-2.6 or better usually)	284
nsplugin	Build plugin for browsers supporting the Netscape plugin architecture (that is almost any modern browser)	180
ocaml	Adds support/bindings for the Ocaml language	22
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	46
oci8-instant-client	Use dev-db/oracle-instantclient-basic as Oracle provider instead of requiring a full Oracle server install	27
odbc	Adds ODBC Support (Open DataBase Connectivity)	368
offensive	Enables potentially offensive items in packages	50
ofx	Enable support for importing (and exporting) OFX (Open Financial eXchange) data files	43
ogg	Adds support for the Ogg container format (commonly used by Vorbis, Theora and flac)	206
old-linux	Add support for linux-2.4 and older	19
openal	Adds support for the Open Audio Library	217
openexr	Support for the OpenEXR graphics file format	107
opengl	Adds support for OpenGL (3D graphics)	1131
openmp	Build support for the OpenMP (support parallel computing), requires >=sys-devel/gcc-4.2 built with USE="openmp"	274
oracle	Enable Oracle Database support	58
osc	Enables support for Open Sound Control	26
oscar	Enable Oscar (AIM/ICQ) IM protocol support	19
oss	Adds support for OSS (Open Sound System)	658
pam	Adds support for PAM (Pluggable Authentication Modules) - DANGEROUS to arbitrarily flip	764
pch	Enable precompiled header support for faster compilation at the expense of disk space and memory (>=sys-devel/gcc-3.4 only)	306
pcmcia	Adds support for PCMCIA slots/devices found on laptop computers	43
pcntl	Adds support for process creation functions	15
pcre	Adds support for Perl Compatible Regular Expressions	219
pda	Adds support for portable devices	42
pdf	Adds general support for PDF (Portable Document Format), this replaces the pdflib and cpdflib flags	173
perl	Adds support/bindings for the Perl language	642
php	Include support for the PHP language	80
plasma	Build optional plasma widgets that require kde-base/libplasma	45
plotutils	Add support for plotutils (library for 2-D vector graphics)	26
png	Adds support for libpng (PNG images)	718
policykit	Use sys-auth/policykit to gain privileges	153
portaudio	Adds support for the crossplatform portaudio audio API	120
posix	Adds support for POSIX-compatible functions	12
postgres	Adds support for the postgresql database	1010
ppds	Adds support for automatically generated ppd (printing driver) files	24
prefix	Defines if a Gentoo Prefix offset installation is used	0
prelude	Adds support/bindings for the Prelude Intrusion Detection System	34
profile	Adds support for software performance analysis (will likely vary from ebuild to ebuild)	1142
pulseaudio	Adds support for PulseAudio sound server	503
python	Adds support/bindings for the Python language	1271
qdbm	Adds support for the qdbm (Quick Database Manager) library	32
qmail-spp	Adds support for qmail SMTP plugins	11
qt4	Adds support for the Qt GUI/Application Toolkit version 4.x	358
quicktime	Adds support for OpenQuickTime	56
radius	Adds support for RADIUS authentication	78
raw	Add support for raw image formats	53
rdesktop	Adds support for the remote desktop protocol, usually used to connect to Windows servers	16
readline	Enables support for libreadline, a GNU line-editing library that almost everyone wants	597
recode	Enables support for the GNU recode library	17
rss	Enables support for RSS feeds	78
ruby	Adds support/bindings for the Ruby language	250
samba	Adds support for SAMBA (Windows File and Printer sharing)	347
sapdb	Adds support for SAP DB	16
sasl	Adds support for the Simple Authentication and Security Layer	302
savedconfig	Use this to restore your config from /etc/portage/savedconfig $/$. Make sure your USE flags allow for appropriate dependencies	83
scanner	Adds support for scanner hardware (e.g. build the sane frontend in kdegraphics)	210
sdl	Adds support for Simple Direct Layer (media library)	520
seamonkey	Adds support for the Seamonkey web-browser	18
selinux	!!internal use only!! Security Enhanced Linux support, this must be set by the selinux profile or breakage will occur	1055
semantic-desktop	Cross-KDE support for semantic search and information retrieval	123
session	Adds persistent session support	50
sharedext	Adds support for building shared extensions in PHP	15
sharedmem	Adds support for shared memory use	17
shorten	Adds support for the shorten audio compressor	6
simplexml	support for SimpleXML	7
skey	Enable S/Key (Single use password) authentication support	44
slang	Adds support for the slang text display library (it's like ncurses, but different)	85
slp	Adds Service Locator Protocol support	49
smartcard	Enables smartcard support	44
smp	Enable support for multiprocessors or multicore systems	36
sndfile	Adds support for libsndfile	114
snmp	Adds support for the Simple Network Management Protocol if available	227
soap	Adds support for SOAP (Simple Object Access Protocol)	34
sockets	Adds support for tcp/ip sockets	30
socks5	Adds support for the socks5 proxy	78
solid	Adds support for the Solid database engine	16
source	Zip the sources and install them	2129
sox	Adds support for Sound eXchange (SoX)	27
speex	Adds support for the speex audio codec (used for speech)	204
spell	Adds dictionary support	460
spl	Adds support for the Standard PHP Library	10
sqlite	Adds support for sqlite - embedded sql database	665
sqlite3	Adds support for sqlite3 - embedded sql database	87
sse	fast floating point optimization for PentiumIII+ class chips	280
sse2	faster floating point optimization for SSE2 capable chips	253
ssl	Adds support for Secure Socket Layer connections	2208
startup-notification	Enable application startup event feedback mechanism	137
static	!!do not set this during bootstrap!! Causes binaries to be statically linked instead of dynamically	1171
static-libs	Build static libraries	695
subversion	Enable subversion (version control system) support	123
suid	Enable setuid root program, with potential security risks	61
svg	Adds support for SVG (Scalable Vector Graphics)	247
svga	Adds support for SVGAlib (graphics library)	166
sybase	Adds support for the Sybase SQL Database Server	17
sybase-ct	Adds support for Sybase-CT	15
symlink	Force kernel ebuilds to automatically update the /usr/src/linux symlink	735
syslog	Enables support for syslog	132
sysvipc	Support for System V-compatible inter-process communication	15
szip	Use the szip compression library	17
taglib	Enable tagging support with taglib	70
tcl	Adds support the Tcl language	294
tcpd	Adds support for TCP wrappers	332
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	6155
theora	Adds support for the Theora Video Compression Codec	174
threads	Adds threads support for various packages. Usually pthreads	779
tidy	Adds support for HTML Tidy	32
tiff	Adds support for the TIFF image format	372
timidity	Build with Timidity++ (MIDI sequencer) support	18
tk	Adds support for Tk GUI toolkit	376
tokenizer	Adds support for the PHP file parser	9
truetype	Adds support for FreeType and/or FreeType2 fonts	359
uclibc	Enable uclibc specific patches and build or link uclibc	27
unicode	Adds support for Unicode	499
usb	Adds USB support to applications that have optional USB support (e.g. cups)	264
v4l	Enables video4linux support	201
v4l2	Enable video4linux2 support	134
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	457
vcd	Video CD support	35
vhosts	Adds support for installing web-based applications into a virtual-hosting environment	733
videos	Install optional video files (used in some games)	29
vim-syntax	Pulls in related vim syntax scripts	268
vnc	Enable VNC (remote desktop viewer) support	47
voodoo3	Adds support for 3Dfx's Voodoo3 video chipset, else defaults to Voodoo4/5 support if not in USE	2
vorbis	Adds support for the OggVorbis audio codec	494
wavpack	Add support for wavpack audio compression tools	90
wddx	Adds support for Web Distributed Data eXchange	15
wifi	Enable wireless network functions	92
win32codecs	use win32codecs package for dll avi decoding support (wmv and what not)	65
wmf	Adds support for the Windows Metafile vector image format	53
wxwidgets	Adds support for wxWidgets/wxGTK GUI toolkit	117
wxwindows	Adds support for wxWidgets/wxGTK GUI toolkit (deprecated, use wxwidgets)	23
X	Adds support for X11	2260
x264	Enable h264 encoding using x264	87
xattr	Adds support for extended attributes (filesystem-stored metadata)	132
Xaw3d	Adds support for the 3d athena widget set	74
xcb	Support the X C-language Binding, a replacement for Xlib	59
xcomposite	Enable support for the Xorg composite extension	145
xemacs	Add support for XEmacs	55
xface	Adds xface support used to allow a small image of xface format to be included in an email via the header 'X-Face'	36
xft	Build with support for XFT font renderer (x11-libs/libXft)	81
xine	Add support for the XINE movie libraries	83
xinerama	Add support for the xinerama X11 extension, which allows you to stretch your display across multiple monitors	780
xinetd	Add support for the xinetd super-server	125
xml	Add support for XML files	562
xmlrpc	Support for xml-rpc library	56
xmp	Enable support for Extensible Metadata Platform (Adobe XMP)	54
xosd	Sends display using the X On Screen Display library	39
xpm	Adds support for XPM graphics format	61
xscreensaver	Adds support for XScreenSaver extension	51
xsl	Check/Support flag for XSL library (version 1)	17
xulrunner	Build native browser integration against xulrunner instead of firefox or seamonkey	53
xv	Adds in optional support for the Xvideo extension (an X API for video playback)	91
xvid	Adds support for xvid.org's open-source mpeg-4 codec	57
yahoo	Enable Yahoo Messenger IM protocol support	28
yaz	Adds in optional support for the Z39.50 Protocol for Information Retrieval (YAZ)	18
zeroconf	Support for DNS Service Discovery (DNS-SD)	112
zlib	Adds support for zlib (de)compression	694
zsh-completion	Enable zsh completion support	84

Local USE Flags