USE Flags
| Flag | Description | Used in Ebuild(s) |
|---|---|---|
| 3dfx | Enable support for Voodoo chipsets, also called as 3DFX and TDFX | 8 |
| 3dnow | Adds support for 3dnow multimedia processor instructions | 34 |
| a52 | Enables support for decoding ATSC A/52 streams used in DVD | 13 |
| aac | Enables support for MPEG-4 AAC Audio | 57 |
| aalib | Adds support for media-libs/aalib (ASCII-Graphics Library) | 28 |
| accessibility | Adds support for accessibility (eg 'at-spi' library) | 27 |
| acl | Adds support for Access Control Lists | 103 |
| acpi | Adds support for Advanced Configuration and Power Interface | 45 |
| adabas | Adds support for the Adabas database engine | 7 |
| adns | Adds support for the adns DNS client library | 8 |
| afs | Adds OpenAFS support (distributed file system) | 18 |
| aim | Enable AIM IM protocol support | 0 |
| alsa | Adds support for media-libs/alsa-lib (Advanced Linux Sound Architecture) | 416 |
| altivec | Adds support for optimizations for G4 and G5/ppc970 processors | 85 |
| ao | Use libao audio output library for sound playback | 29 |
| apache2 | Add Apache2 support | 32 |
| apm | Adds APM (Advanced Power Management) support | 23 |
| aqua | Include support for the Aqua / Carbon GUI | 1659 |
| atm | Enable Asynchronous Transfer Mode protocol support | 13 |
| audiofile | Adds support for libaudiofile where applicable | 20 |
| avahi | Add avahi/Zeroconf support | 89 |
| bash-completion | Enable bash-completion support | 223 |
| bcmath | Adds support for libbcmath | 7 |
| berkdb | Adds support for sys-libs/db (Berkeley DB for MySQL) | 139 |
| bidi | Enables bidirectional language support | 18 |
| bindist | Flag to enable or disable options for prebuilt (GRP) packages (eg. due to licensing issues) | 73 |
| birdstep | Adds support for the Birdstep Database Server | 7 |
| blas | Adds support for the virtual/blas numerical library | 18 |
| bluetooth | Enables Bluetooth Support | 81 |
| bootstrap | !!internal use only!! DO NOT SET THIS FLAG YOURSELF!, used during original system bootstrapping [make stage2] | 25 |
| boundschecking | Adds the bounds checking patch by Haj Ten Brugge, this will DISABLE the hardened PIE+SSP patches | 2 |
| branding | Enable Gentoo specific branding | 17 |
| bsf | Enable support for Apache Bean Scripting Framework (dev-java/bsf) | 4 |
| build | !!internal use only!! DO NOT SET THIS FLAG YOURSELF!, used for creating build images and the first half of bootstrapping [make stage1] | 220 |
| bzip2 | Use the bzlib compression library | 100 |
| cairo | Enable support for the cairo graphics library | 64 |
| calendar | Adds support for calendars (not using mcal!) | 10 |
| canna | Adds support for the Canna kana to kanji conversion engine | 12 |
| caps | Use Linux capabilities library to control privilege | 74 |
| cdb | Adds support for the CDB database engine from the author of qmail | 16 |
| cdda | Adds Compact Disk Digital Audio (Standard Audio CD) support | 19 |
| cddb | Access cddb servers to retrieve and submit information about compact disks | 18 |
| cdinstall | Copies files from the CD rather than asking the user to copy them, mostly used with games | 24 |
| cdparanoia | Enables cdparanoia (audio CD ripper) support | 10 |
| cdr | Adds support for CD writer hardware | 16 |
| cgi | Add CGI script support | 47 |
| chasen | Enable chasen (Japanese Morphological Analysis System) support | 4 |
| cjk | Adds support for Multi-byte character languages (Chinese, Japanese, Korean) | 63 |
| clamav | Adds support for Clam AntiVirus software (usually with a plugin) | 19 |
| coreaudio | Build the CoreAudio driver on Mac OS X systems | 3 |
| cracklib | Support for cracklib strong password checking | 16 |
| crypt | Add support for encryption -- using mcrypt or gpg where applicable | 204 |
| cscope | Enables cscope interface -- in vim for example | 18 |
| css | Enables reading of encrypted DVDs | 10 |
| ctype | Enables ctype functions | 7 |
| cups | Add support for CUPS (Common Unix Printing System) | 144 |
| curl | Adds support for client-side URL transfer library | 108 |
| curlwrappers | Adds support for using curl in streams | 7 |
| custom-cflags | Build with user-specified CFLAGS (unsupported) | 105 |
| cvs | Enable CVS (Concurrent Versions System) integration | 47 |
| cxx | Builds support for C++ (bindings, extra libraries, code generation, ...) | 25 |
| db2 | Enables support for IBM DB2 database server | 7 |
| dbase | Adds support for dbase file format | 7 |
| dbi | Enable dev-db/libdbi (database-independent abstraction layer) support | 14 |
| dbm | Adds support for generic DBM databases | 8 |
| dbmaker | Adds support for dbmaker database server | 7 |
| dbus | Enable dbus support for anything that needs it (gpsd, gnomemeeting, etc) | 248 |
| 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 | 4731 |
| dedicated | Adds support for dedicated game servers (some packages do not provide clients and servers at the same time) | 96 |
| dga | Adds DGA (Direct Graphic Access) support for X | 24 |
| directfb | Adds support for DirectFB layer (library for FB devices) | 31 |
| djvu | support DjVu, a PDF-like document format esp. suited for scanned documents | 15 |
| doc | Adds extra documentation (API, Javadoc, etc) | 4140 |
| dri | Enable direct rendering: used for accelerated 3D and some 2D, like DMA | 17 |
| dts | Enables DTS Coherent Acoustics decoder support | 8 |
| dv | Enables support for a codec used by many camcorders | 19 |
| dvb | Adds support for DVB (Digital Video Broadcasting) | 25 |
| dvd | Adds support for DVDs | 23 |
| dvdr | Adds support for DVD writer hardware (e.g. in xcdroast) | 16 |
| eds | Enables support for Evolution-Data-Server (EDS) | 45 |
| emacs | Adds support for GNU Emacs | 283 |
| emboss | Adds support for the European Molecular Biology Open Software Suite | 12 |
| empress | Adds support for the Empress database server | 7 |
| empress-bcs | Adds local access support for the Empress database server | 7 |
| encode | Adds support for encoding of audio or video files | 26 |
| enscript | Add enscript support to colourize code stored in the repository | 4 |
| esd | Adds support for media-sound/esound (Enlightened Sound Daemon) | 139 |
| esoob | Adds support for Easysoft OOD database | 7 |
| evo | Adds support for mail-client/evolution | 8 |
| examples | Install examples, usually source code | 986 |
| exif | Adds support for reading EXIF headers from JPEG and TIFF images | 59 |
| expat | Enable the use of dev-libs/expat for XML parsing | 37 |
| fam | Enable FAM (File Alteration Monitor) support | 55 |
| fastcgi | Add support for the FastCGI interface | 27 |
| fbcon | Adds framebuffer support for the console, via the kernel | 49 |
| ffmpeg | Enable ffmpeg-based audio/video codec support | 88 |
| fftw | Use FFTW library for computing Fourier transforms | 77 |
| firebird | Adds support for the Firebird relational database | 42 |
| firefox | Build against Firefox instead of Seamonkey/Mozilla | 13 |
| flac | Adds support for FLAC: Free Lossless Audio Codec | 106 |
| flatfile | Adds dbm support for flat files | 8 |
| fltk | Adds support for the Fast Light Toolkit gui interface | 21 |
| fontconfig | Support for configuring and customizing font access via media-libs/fontconfig | 24 |
| foomaticdb | Adds support for the foomatic printing driver database | 9 |
| fortran | Adds support for fortran (formerly f77) | 49 |
| freetds | Adds support for the TDS protocol to connect to MSSQL/Sybase databases | 8 |
| freewnn | Adds support for FreeWnn kana to kanji conversion engine | 7 |
| frontbase | Adds support for the frontbase sql server | 7 |
| ftp | Adds FTP (File Transfer Protocol) support | 16 |
| gcj | Enable building with gcj (The GNU Compiler for the Javatm Programming Language) | 13 |
| gd | Adds support for media-libs/gd (to generate graphics on the fly) | 53 |
| gd-external | Use the external version of gd rather than the bundled one (possibly dangerous) | 7 |
| gdbm | Adds support for sys-libs/gdbm (GNU database libraries) | 86 |
| geoip | Add geoip support for country and city lookup based on IPs | 23 |
| ggi | Adds support for media-libs/libggi (non-X video api/drivers) | 19 |
| gif | Adds GIF image support | 73 |
| gimp | Build a plugin for the GIMP | 19 |
| ginac | Adds sci-mathematics/ginac (symbolic math) support | 5 |
| glut | Build an OpenGL plugin using the GLUT library | 6 |
| gmp | Adds support for dev-libs/gmp (GNU MP library) | 62 |
| gnome | Adds GNOME support | 351 |
| gnome-keyring | Enable support for storing passwords via gnome-keyring | 38 |
| gnuplot | Enable support for gnuplot (data and function plotting) | 16 |
| gnustep | Adds integration with GNUstep environment | 2 |
| gnutls | Adds support for net-libs/gnutls (TLS 1.0 and SSL 3.0 support) | 197 |
| gphoto2 | Adds digital camera support | 26 |
| gpm | Adds support for sys-libs/gpm (Console-based mouse driver) | 85 |
| gps | Adds support for Global Positioning System | 14 |
| graphviz | Adds support for the Graphviz library | 30 |
| gsl | Use the GNU scientific library for calculations | 19 |
| gsm | Adds support for the gsm lossy speech compression codec | 33 |
| gstreamer | Adds support for media-libs/gstreamer (Streaming media) | 71 |
| gtk | Adds support for x11-libs/gtk+ (The GIMP Toolkit) | 462 |
| gtkhtml | Adds support for gnome-extra/gtkhtml | 18 |
| guile | Adds support for the guile Scheme interpreter | 32 |
| gzip | just to commit | 39 |
| hal | Enable Hardware Abstraction Layer (HAL) support | 161 |
| handbook | Enable handbooks generation for KDE4. | 5 |
| hardened | activate default security enhancements for toolchain (gcc, glibc, binutils) | 92 |
| hddtemp | Enable monitoring of hdd temperature (app-admin/hddtemp) | 9 |
| hdf5 | Adds support for the Hierarchical Data Format v5 | 29 |
| ibm | Add support for IBM ppc64 specific systems | 11 |
| iconv | Enable support for the iconv character set conversion library | 103 |
| icq | Enable ICQ IM protocol support | 3 |
| icu | Enable ICU (Internationalization Components for Unicode) support, using dev-libs/icu | 45 |
| idn | Enable support for Internationalized Domain Names | 48 |
| ieee1394 | Enable FireWire/iLink IEEE1394 support (dv, camera, ...) | 32 |
| imagemagick | Enables support for Imagemagick (image converter) | 56 |
| imap | Adds support for IMAP (Internet Mail Application Protocol) | 25 |
| imlib | Adds support for imlib, an image loading and rendering library | 28 |
| inifile | Adds dbm support for .ini files | 7 |
| innodb | Adds innodb support for mySQL (transaction support) | 1 |
| interbase | Adds support for Interbase database | 7 |
| iodbc | Adds support for iODBC library | 21 |
| ipod | Enable support for iPod device access | 27 |
| ipv6 | Adds support for IP version 6 | 544 |
| jabber | Enable jabber IM protocol support | 26 |
| jack | Adds support for the JACK Audio Connection Kit | 175 |
| java | Adds support for Java | 271 |
| java5 | Use Java 1.5 to build package || ( reduced deps, 1.5 features, source/target 1.5 ) | 1 |
| java6 | Use Java 1.6 to build package with || ( reduced deps, 1.6 features, source/target 1.6 ) | 11 |
| javascript | Enables javascript support | 13 |
| jbig | enables jbig-kit support for tiff, Hylafax, ImageMagick, etc | 20 |
| jingle | Enables voice calls for jabber | 10 |
| joystick | Add support for joysticks in all packages | 29 |
| jpeg | Adds JPEG image support | 279 |
| jpeg2k | Support for JPEG 2000, a wavelet-based image compression format | 56 |
| kde | Adds support for kde-base/kde (K Desktop Enviroment) | 123 |
| 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 | 1470 |
| kdeprefix | Makes a KDE prefixed install into /usr/kde/$ if enabled or into /usr (FHS compatible) otherwise | 1399 |
| kerberos | Adds kerberos support | 241 |
| kolab | Adds support for the Kolab groupware server | 12 |
| kontact | Enable support for the KDE personal information manager (kde-base/kdepim*) | 2 |
| krb4 | Adds optional kerberos 4 compatibility support | 12 |
| ladspa | Enables the ability to support ladspa plugins | 27 |
| lame | Prefer using LAME libraries for MP3 encoding support | 28 |
| lapack | Adds support for the virtual/lapack numerical library | 25 |
| lash | Adds LASH Audio Session Handler support | 18 |
| latex | Adds support for LaTeX (typesetting package) | 63 |
| lcms | Adds lcms support (color management engine) | 71 |
| ldap | Adds LDAP support (Lightweight Directory Access Protocol) | 366 |
| libcaca | Add support for colored ASCII-art graphics | 13 |
| libedit | Use the libedit library (replacement for readline) | 24 |
| libgda | Adds GNOME Data Access support | 7 |
| libnotify | Enable desktop notification support | 142 |
| libsamplerate | Build with support for converting sample rates using libsamplerate | 48 |
| libwww | Adds libwww support (General purpose WEB API) | 18 |
| lirc | Adds support for lirc (Linux's Infra-Red Remote Control) | 69 |
| livecd | !!internal use only!! DO NOT SET THIS FLAG YOURSELF!, used during livecd building | 19 |
| lm_sensors | Adds linux lm_sensors (hardware sensors) support | 22 |
| lua | Enable Lua scripting support | 78 |
| lzo | Enables support for lzo compression | 20 |
| m17n-lib | Enable m17n-lib support | 17 |
| mad | Adds support for mad (high-quality mp3 decoder library and cli frontend) | 47 |
| maildir | Adds support for maildir (~/.maildir) style mail spools | 12 |
| mailwrapper | Adds mailwrapper support to allow multiple MTAs to be installed | 31 |
| matroska | Adds support for the matroska container format (extensions .mkv, .mka and .mks) | 15 |
| matrox | Adds Matrox MGA support to mplayer | 2 |
| mbox | Adds support for mbox (/var/spool/mail) style mail spools | 29 |
| mcve | Support for the MCVE credit card payment system | 7 |
| memlimit | Adds memory usage limiting in supporting programs | 1 |
| mhash | Adds support for the mhash library | 10 |
| migemo | Enables migemo support for Japanese | 13 |
| mikmod | Adds libmikmod support to allow playing of SoundTracker-style music files | 15 |
| milter | Adds sendmail mail filter (milter) support | 8 |
| mime | Adds MIME support | 4 |
| minimal | Install a very minimal build (disables, for example, plugins, fonts, most drivers, non-critical features) | 329 |
| mmap | Adds mmap (memory map) support | 9 |
| mmx | Adds support for optimizations for Pentium MMX and Athlon class processors | 169 |
| mng | Adds support for libmng (MNG images) | 18 |
| modplug | Adds libmodplug support | 21 |
| modules | Build the kernel modules | 10 |
| mono | Build Mono bindings to support dotnet type stuff | 30 |
| motif | Adds support for the Motif toolkit | 61 |
| mozilla | Adds support for the Mozilla web-browser | 11 |
| mp3 | Add support for reading mp3 files | 95 |
| mp4 | Support for MP4 container format | 13 |
| mpeg | Adds libmpeg3 support to various packages | 21 |
| mpi | Adds MPI (Message Passing Interface) layer to the apps that support it | 84 |
| mplayer | Enable mplayer support for playback or encoding | 19 |
| msn | Enable MSN Messenger IM protocol support | 19 |
| msql | Adds support for the MSQL database server | 8 |
| mssql | Adds support for Microsoft SQL Server database | 23 |
| mtp | Enable support for Media Transfer Protocol | 19 |
| mule | Adds multi-language support to XEmacs | 3 |
| multilib | On 64bit systems, if you want to be able to compile 32bit and 64bit binaries | 53 |
| musepack | Enable support for the musepack audio codec | 23 |
| musicbrainz | Lookup audio metadata using MusicBrainz community service (musicbrainz.org) | 21 |
| mysql | Adds mySQL Database support | 415 |
| mysqli | Adds support for the improved mySQL libraries | 11 |
| nas | Adds support for network audio sound | 89 |
| ncurses | Adds ncurses support (console display library) | 207 |
| netboot | Enables network booting | 11 |
| netcdf | Enable NetCDF data format support | 13 |
| networkmanager | Enable net-misc/networkmanager support | 45 |
| neXt | Enable neXt toolkit | 12 |
| nis | Support for NIS/YP services | 35 |
| nls | Adds Native Language Support (using gettext - GNU locale utilities) | 1398 |
| nntp | Add support for newsgroups (Network News Transfer Protocol) | 22 |
| 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) | 64 |
| nptl | Enable support for Native POSIX Threads Library, the new threading module (requires linux-2.6 or better usually) | 35 |
| nsplugin | Build plugin for browsers supporting the Netscape plugin architecture (that is almost any modern browser) | 60 |
| ocaml | Adds support/bindings for the Ocaml language | 13 |
| 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 | 19 |
| oci8-instant-client | Use dev-db/oracle-instantclient-basic as Oracle provider instead of requiring a full Oracle server install | 12 |
| odbc | Adds ODBC Support (Open DataBase Connectivity) | 135 |
| offensive | Enables potentially offensive items in packages | 21 |
| ofx | Enable support for importing (and exporting) OFX (Open Financial eXchange) data files | 18 |
| ogg | Adds support for the Ogg container format (commonly used by Vorbis, Theora and flac) | 55 |
| old-linux | Add support for linux-2.4 and older | 8 |
| openal | Adds support for the Open Audio Library | 40 |
| openexr | Support for the OpenEXR graphics file format | 35 |
| opengl | Adds support for OpenGL (3D graphics) | 365 |
| openmp | Build support for the OpenMP (support parallel computing), requires >=sys-devel/gcc-4.2 built with USE="openmp" | 48 |
| oracle | Enable Oracle Database support | 24 |
| osc | Enables support for Open Sound Control | 6 |
| oscar | Enable Oscar (AIM/ICQ) IM protocol support | 5 |
| oss | Adds support for OSS (Open Sound System) | 222 |
| pam | Adds support PAM (Pluggable Authentication Modules) - DANGEROUS to arbitrarily flip | 317 |
| pch | Enable precompiled header support for faster compilation at the expense of disk space and memory (>=sys-devel/gcc-3.4 only) | 66 |
| pcmcia | Adds support for PCMCIA slots/devices found on laptop computers | 12 |
| pcntl | Adds support for process creation functions | 7 |
| pcre | Adds support for Perl Compatible Regular Expressions | 90 |
| pda | Adds support for portable devices | 17 |
| Adds general support for PDF (Portable Document Format), this replaces the pdflib and cpdflib flags | 52 | |
| perl | Adds support/bindings for the Perl language | 329 |
| php | Include support for the PHP language | 32 |
| plasma | Build optional plasma widgets that require kde-base/libplasma | 13 |
| plotutils | Add support for plotutils (library for 2-D vector graphics) | 10 |
| png | Adds support for libpng (PNG images) | 276 |
| policykit | Use sys-auth/policykit to gain privileges | 55 |
| portaudio | Adds support for the crossplatform portaudio audio API | 31 |
| posix | Adds support for POSIX-compatible functions | 7 |
| postgres | Adds support for the postgresql database | 367 |
| ppds | Adds support for automatically generated ppd (printing driver) files | 9 |
| prefix | Defines if a Gentoo Prefix offset installation is used | 0 |
| prelude | Adds support/bindings for the Prelude Intrusion Detection System | 14 |
| profile | Adds support for software performance analysis (will likely vary from ebuild to ebuild) | 267 |
| pulseaudio | Adds support for PulseAudio sound server | 135 |
| python | Adds support/bindings for the Python language | 474 |
| qdbm | Adds support for the qdbm (Quick Database Manager) library | 13 |
| qmail-spp | Adds support for qmail SMTP plugins | 5 |
| qt3 | Adds support for the Qt GUI/Application Toolkit version 3.x | 9 |
| qt4 | Adds support for the Qt GUI/Application Toolkit version 4.x | 98 |
| quicktime | Adds support for OpenQuickTime | 18 |
| radius | Adds support for RADIUS authentication | 28 |
| raw | Add support for raw image formats | 18 |
| rdesktop | Adds support for the remote desktop protocol, usually used to connect to Windows servers | 7 |
| readline | Enables support for libreadline, a GNU line-editing library that almost everyone wants | 271 |
| recode | Enables support for the GNU recode library | 10 |
| rss | Enables support for RSS feeds | 20 |
| ruby | Adds support/bindings for the Ruby language | 97 |
| samba | Adds support for SAMBA (Windows File and Printer sharing) | 106 |
| sapdb | Adds support for SAP DB | 7 |
| sasl | Adds support for the Simple Authentication and Security Layer | 111 |
| savedconfig | Use this to restore your config from /etc/portage/savedconfig $/$. Make sure your USE flags allow for appropriate dependencies | 31 |
| scanner | Adds support for scanner hardware (e.g. build the sane frontend in kdegraphics) | 60 |
| sdl | Adds support for Simple Direct Layer (media library) | 155 |
| seamonkey | Adds support for the Seamonkey web-browser | 17 |
| selinux | !!internal use only!! Security Enhanced Linux support, this must be set by the selinux profile or breakage will occur | 399 |
| semantic-desktop | Cross-KDE support for semantic search and information retrieval | 50 |
| session | Adds persistent session support | 22 |
| sharedext | Adds support for building shared extensions in PHP | 7 |
| sharedmem | Adds support for shared memory use | 8 |
| shorten | Adds support for the shorten audio compressor | 2 |
| simplexml | support for SimpleXML | 7 |
| skey | Enable S/Key (Single use password) authentication support | 16 |
| slang | Adds support for the slang text display library (it's like ncurses, but different) | 31 |
| slp | Adds Service Locator Protocol support | 21 |
| smartcard | Enables smartcard support | 19 |
| smp | Enable support for multiprocessors or multicore systems | 13 |
| sndfile | Adds support for libsndfile | 38 |
| snmp | Adds support for the Simple Network Management Protocol if available | 90 |
| soap | Adds support for SOAP (Simple Object Access Protocol) | 12 |
| sockets | Adds support for tcp/ip sockets | 13 |
| socks5 | Adds support for the socks5 proxy | 31 |
| solid | Adds support for the Solid database engine | 7 |
| source | Zip the sources and install them | 878 |
| sox | Adds support for Sound eXchange (SoX) | 12 |
| speex | Adds support for the speex audio codec (used for speech) | 45 |
| spell | Adds dictionary support | 172 |
| spl | Adds support for the Standard PHP Library | 7 |
| sqlite | Adds support for sqlite - embedded sql database | 210 |
| sqlite3 | Adds support for sqlite3 - embedded sql database | 36 |
| sse | fast floating point optimization for PentiumIII+ class chips | 75 |
| sse2 | faster floating point optimization for SSE2 capable chips | 64 |
| ssl | Adds support for Secure Socket Layer connections | 829 |
| startup-notification | Enable application startup event feedback mechanism | 46 |
| static | !!do not set this during bootstrap!! Causes binaries to be statically linked instead of dynamically | 454 |
| static-libs | Build static libraries | 48 |
| subversion | Enable subversion (version control system) support | 71 |
| suid | Enable setuid root program, with potential security risks | 25 |
| svg | Adds support for SVG (Scalable Vector Graphics) | 86 |
| svga | Adds support for SVGAlib (graphics library) | 63 |
| sybase | Adds support for the Sybase SQL Database Server | 8 |
| sybase-ct | Adds support for Sybase-CT | 7 |
| symlink | Force kernel ebuilds to automatically update the /usr/src/linux symlink | 171 |
| syslog | Enables support for syslog | 47 |
| sysvipc | Support for System V-compatible inter-process communication | 7 |
| szip | Use the szip compression library | 9 |
| taglib | Enable tagging support with taglib | 30 |
| tcl | Adds support the Tcl language | 134 |
| tcpd | Adds support for TCP wrappers | 130 |
| 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 | 1725 |
| theora | Adds support for the Theora Video Compression Codec | 44 |
| threads | Adds threads support for various packages. Usually pthreads | 302 |
| tidy | Adds support for HTML Tidy | 16 |
| tiff | Adds support for the TIFF image format | 132 |
| timidity | Build with Timidity++ (MIDI sequencer) support | 8 |
| tk | Adds support for Tk GUI toolkit | 182 |
| tokenizer | Adds support for the PHP file parser | 7 |
| truetype | Adds support for FreeType and/or FreeType2 fonts | 152 |
| uclibc | Enable uclibc specific patches and build or link uclibc | 11 |
| unicode | Adds support for Unicode | 204 |
| usb | Adds USB support to applications that have optional USB support (e.g. cups) | 94 |
| v4l | Enables video4linux support | 60 |
| v4l2 | Enable video4linux2 support | 32 |
| 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 | 92 |
| vcd | Video CD support | 10 |
| vhosts | Adds support for installing web-based applications into a virtual-hosting environment | 224 |
| videos | Install optional video files (used in some games) | 10 |
| vim-syntax | Pulls in related vim syntax scripts | 83 |
| vnc | Enable VNC (remote desktop viewer) support | 16 |
| 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 | 160 |
| wavpack | Add support for wavpack audio compression tools | 32 |
| wddx | Adds support for Web Distributed Data eXchange | 7 |
| wifi | Enable wireless network functions | 11 |
| win32codecs | use win32codecs package for dll avi decoding support (wmv and what not) | 12 |
| wmf | Adds support for the Windows Metafile vector image format | 20 |
| wxwidgets | Adds support for wxWidgets/wxGTK GUI toolkit | 37 |
| wxwindows | Adds support for wxWidgets/wxGTK GUI toolkit (deprecated, use wxwidgets) | 4 |
| X | Adds support for X11 | 870 |
| x264 | Enable h264 encoding using x264 | 26 |
| xattr | Adds support for extended attributes (filesystem-stored metadata) | 47 |
| Xaw3d | Adds support for the 3d athena widget set | 42 |
| xcb | Support the X C-language Binding, a replacement for Xlib | 6 |
| xcomposite | Enable support for the Xorg composite extension | 39 |
| xemacs | Add support for XEmacs | 20 |
| xface | Adds xface support used to allow a small image of xface format to be included in an email via the header 'X-Face' | 23 |
| xft | Build with support for XFT font renderer (x11-libs/libXft) | 29 |
| xine | Add support for the XINE movie libraries | 19 |
| xinerama | Add support for the xinerama X11 extension, which allows you to stretch your display across multiple monitors | 187 |
| xinetd | Add support for the xinetd super-server | 80 |
| xml | Add support for XML files | 213 |
| xmlrpc | Support for xml-rpc library | 17 |
| xmp | Enable support for Extensible Metadata Platform (Adobe XMP) | 20 |
| xosd | Sends display using the X On Screen Display library | 11 |
| xpm | Adds support for XPM graphics format | 25 |
| xscreensaver | Adds support for XScreenSaver extension | 12 |
| xsl | Check/Support flag for XSL library (version 1) | 7 |
| xulrunner | Build native browser integration against xulrunner instead of firefox or seamonkey | 26 |
| xv | Adds in optional support for the Xvideo extension (an X API for video playback) | 29 |
| xvid | Adds support for xvid.org's open-source mpeg-4 codec | 19 |
| yahoo | Enable Yahoo Messenger IM protocol support | 11 |
| yaz | Adds in optional support for the Z39.50 Protocol for Information Retrieval (YAZ) | 8 |
| zeroconf | Support for DNS Service Discovery (DNS-SD) | 44 |
| zlib | Adds support for zlib (de)compression | 307 |
| zsh-completion | Enable zsh completion support | 26 |
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