# Copyright 1999-2015 Gentoo Foundation # Distributed under the terms of the GNU General Public License v2 # Keep them sorted 3dfx - Enable support for Voodoo chipsets, also called as 3DFX and TDFX X - Add support for X11 Xaw3d - Add support for the 3d athena widget set a52 - Enable support for decoding ATSC A/52 streams used in DVD aac - Enable support for MPEG-4 AAC Audio aalib - Add support for media-libs/aalib (ASCII-Graphics Library) accessibility - Add support for accessibility (eg 'at-spi' library) acl - Add support for Access Control Lists acpi - Add support for Advanced Configuration and Power Interface adns - Add support for asynchronous DNS resolution afs - Add OpenAFS support (distributed file system) aim - Enable AIM IM protocol support alsa - Add support for media-libs/alsa-lib (Advanced Linux Sound Architecture) altivec - Add support for optimizations for G4 and G5/ppc970 processors ao - Use libao audio output library for sound playback apache2 - Add Apache2 support apm - Add APM (Advanced Power Management) support aqua - Include support for the Mac OS X Aqua (Carbon/Cocoa) GUI atm - Enable Asynchronous Transfer Mode protocol support audiofile - Add support for libaudiofile where applicable audit - Enable support for Linux audit subsystem using sys-process/audit avahi - Add avahi/Zeroconf support ayatana - Build in support for Ayatana notification using the libindicate or libappindicator plugin bash-completion - Enable bash-completion support bcmath - Add support for libbcmath berkdb - Add support for sys-libs/db (Berkeley DB for MySQL) bidi - Enable bidirectional language support bindist - Flag to enable or disable options for prebuilt (GRP) packages (eg. due to licensing issues) blas - Add support for the virtual/blas numerical library bluetooth - Enable Bluetooth Support bootstrap - !!internal use only!! DO NOT SET THIS FLAG YOURSELF!, used during original system bootstrapping [make stage2] boundschecking - Add the bounds checking patch by Haj Ten Brugge, this will DISABLE the hardened PIE+SSP patches branding - Enable Gentoo specific branding bsf - Enable support for Apache Bean Scripting Framework (dev-java/bsf) build - !!internal use only!! DO NOT SET THIS FLAG YOURSELF!, used for creating build images and the first half of bootstrapping [make stage1] bzip2 - Use the bzlib compression library cairo - Enable support for the cairo graphics library calendar - Add support for calendars (not using mcal!) canna - Add support for the Canna kana to kanji conversion engine caps - Use Linux capabilities library to control privilege cdb - Add support for the CDB database engine from the author of qmail cdda - Add Compact Disk Digital Audio (Standard Audio CD) support cddb - Access cddb servers to retrieve and submit information about compact disks cdinstall - Copy files from the CD rather than asking the user to copy them, mostly used with games cdparanoia - Enable cdparanoia (audio CD ripper) support cdr - Add support for CD writer hardware cgi - Add CGI script support cjk - Add support for Multi-byte character languages (Chinese, Japanese, Korean) clamav - Add support for Clam AntiVirus software (usually with a plugin) connman - Add support for net-misc/connman coreaudio - Build the CoreAudio driver on Mac OS X systems cracklib - Support for cracklib strong password checking crypt - Add support for encryption -- using mcrypt or gpg where applicable cscope - Enable cscope interface -- in vim for example css - Enable reading of encrypted DVDs ctype - Enable ctype functions cups - Add support for CUPS (Common Unix Printing System) curl - Add support for client-side URL transfer library custom-cflags - Build with user-specified CFLAGS (unsupported) cvs - Enable CVS (Concurrent Versions System) integration cxx - Build support for C++ (bindings, extra libraries, code generation, ...) dbi - Enable dev-db/libdbi (database-independent abstraction layer) support dbm - Add support for generic DBM databases dbus - Enable dbus support for anything that needs it (gpsd, gnomemeeting, etc) debug - Enable extra debug codepaths, like asserts and extra output. If you want to get meaningful backtraces see https://wiki.gentoo.org/wiki/Project:Quality_Assurance/Backtraces dedicated - Add support for dedicated game servers (some packages do not provide clients and servers at the same time) dga - Add DGA (Direct Graphic Access) support for X directfb - Add support for DirectFB layer (library for FB devices) djvu - Support DjVu, a PDF-like document format esp. suited for scanned documents doc - Add extra documentation (API, Javadoc, etc). It is recommended to enable per package instead of globally dri - Enable direct rendering: used for accelerated 3D and some 2D, like DMA dts - Enable DTS Coherent Acoustics decoder support dv - Enable support for a codec used by many camcorders dvb - Add support for DVB (Digital Video Broadcasting) dvd - Add support for DVDs dvdr - Add support for DVD writer hardware (e.g. in xcdroast) eds - Enable support for Evolution-Data-Server (EDS) emacs - Add support for GNU Emacs emboss - Add support for the European Molecular Biology Open Software Suite encode - Add support for encoding of audio or video files enscript - Add enscript support to colourize code stored in the repository evo - Add support for mail-client/evolution examples - Install examples, usually source code exif - Add support for reading EXIF headers from JPEG and TIFF images expat - Enable the use of dev-libs/expat for XML parsing fam - Enable FAM (File Alteration Monitor) support fastcgi - Add support for the FastCGI interface fbcon - Add framebuffer support for the console, via the kernel ffmpeg - Enable ffmpeg/libav-based audio/video codec support fftw - Use FFTW library for computing Fourier transforms filecaps - Use Linux file capabilities to control privilege rather than set*id (this is orthogonal to USE=caps which uses capabilities at runtime e.g. libcap) firebird - Add support for the Firebird relational database flac - Add support for FLAC: Free Lossless Audio Codec flatfile - Add dbm support for flat files fltk - Add support for the Fast Light Toolkit gui interface fontconfig - Support for configuring and customizing font access via media-libs/fontconfig foomaticdb - Add support for the foomatic printing driver database fortran - Add support for fortran freetds - Add support for the TDS protocol to connect to MSSQL/Sybase databases freewnn - Add support for FreeWnn kana to kanji conversion engine ftp - Add FTP (File Transfer Protocol) support gcj - Enable building with gcj (The GNU Compiler for the Javatm Programming Language) gd - Add support for media-libs/gd (to generate graphics on the fly) gdbm - Add support for sys-libs/gdbm (GNU database libraries) geoip - Add geoip support for country and city lookup based on IPs geolocation - Enable physical position determination ggi - Add support for media-libs/libggi (non-X video api/drivers) gif - Add GIF image support gimp - Build a plugin for the GIMP git - Enable git (version control system) support glut - Build an OpenGL plugin using the GLUT library gmp - Add support for dev-libs/gmp (GNU MP library) gnome - Add GNOME support gnome-keyring - Enable support for storing passwords via gnome-keyring gnuplot - Enable support for gnuplot (data and function plotting) gnutls - Add support for net-libs/gnutls (TLS 1.0 and SSL 3.0 support) gphoto2 - Add digital camera support gpm - Add support for sys-libs/gpm (Console-based mouse driver) gps - Add support for Global Positioning System graphicsmagick - Build and link against GraphicsMagick instead of ImageMagick (might require USE=imagemagick if optional) graphviz - Add support for the Graphviz library gsl - Use the GNU scientific library for calculations gsm - Add support for the gsm lossy speech compression codec gstreamer - Add support for media-libs/gstreamer (Streaming media) gtk - Add support for x11-libs/gtk+ (The GIMP Toolkit) guile - Add support for the guile Scheme interpreter gzip - Compress files with Lempel-Ziv coding (LZ77) handbook - Enable handbooks generation for packages by KDE hardened - Activate default security enhancements for toolchain (gcc, glibc, binutils) hddtemp - Enable monitoring of hdd temperature (app-admin/hddtemp) hdf5 - Add support for the Hierarchical Data Format v5 hscolour - Include coloured haskell sources to generated documentation (dev-haskell/hscolour) ibm - Add support for IBM ppc64 specific systems iconv - Enable support for the iconv character set conversion library icq - Enable ICQ IM protocol support icu - Enable ICU (Internationalization Components for Unicode) support, using dev-libs/icu idn - Enable support for Internationalized Domain Names ieee1394 - Enable FireWire/iLink IEEE1394 support (dv, camera, ...) imagemagick - Enable optional support for the ImageMagick or GraphicsMagick image converter imap - Add support for IMAP (Internet Mail Application Protocol) imlib - Add support for imlib, an image loading and rendering library infiniband - Enable Infiniband RDMA transport support inifile - Add dbm support for .ini files inotify - Enable inotify filesystem monitoring support introspection - Add support for GObject based introspection iodbc - Add support for iODBC library ios - Enable support for Apple's iDevice with iOS operating system (iPad, iPhone, iPod, etc) ipod - Enable support for iPod device access ipv6 - Add support for IP version 6 iwmmxt - Add support for optimizations for ARM iwMMXt instructions jack - Add support for the JACK Audio Connection Kit java - Add support for Java javascript - Enable javascript support jbig - Enable jbig-kit support for tiff, Hylafax, ImageMagick, etc jingle - Enable voice calls for jabber jit - Enable just-in-time compilation for improved performance. May prevent use of some PaX memory protection features in Gentoo Hardened. joystick - Add support for joysticks in all packages jpeg - Add JPEG image support jpeg2k - Support for JPEG 2000, a wavelet-based image compression format kde - Add support for KDE (K Desktop Environment) kerberos - Add kerberos support kolab - Add support for the Kolab groupware server kontact - Enable support for the KDE personal information manager (kde-apps/kdepim*) ladspa - Enable the ability to support ladspa plugins lame - Prefer using LAME libraries for MP3 encoding support lapack - Add support for the virtual/lapack numerical library lash - Add LASH Audio Session Handler support latex - Add support for LaTeX (typesetting package) lcms - Add lcms support (color management engine) ldap - Add LDAP support (Lightweight Directory Access Protocol) libass - SRT/SSA/ASS (SubRip / SubStation Alpha) subtitle support libav - Prefer libav over ffmpeg whenever both are supported libcaca - Add support for colored ASCII-art graphics libedit - Use the libedit library (replacement for readline) libffi - Enable support for Foreign Function Interface library libnotify - Enable desktop notification support libressl - Use dev-libs/libressl as SSL provider (might need ssl USE flag), packages should not depend on this USE flag libsamplerate - Build with support for converting sample rates using libsamplerate libwww - Add libwww support (General purpose WEB API) lirc - Add support for lirc (Linux's Infra-Red Remote Control) livecd - !!internal use only!! DO NOT SET THIS FLAG YOURSELF!, used during livecd building lm_sensors - Add linux lm_sensors (hardware sensors) support lua - Enable Lua scripting support lzma - Support for LZMA (de)compression algorithm lzo - Enable support for lzo compression m17n-lib - Enable m17n-lib support mad - Add support for mad (high-quality mp3 decoder library and cli frontend) maildir - Add support for maildir (~/.maildir) style mail spools matroska - Add support for the matroska container format (extensions .mkv, .mka and .mks) mbox - Add support for mbox (/var/spool/mail) style mail spools memcached - Add support for memcached memlimit - Add memory usage limiting in supporting programs mhash - Add support for the mhash library migemo - Enable migemo support for Japanese mikmod - Add libmikmod support to allow playing of SoundTracker-style music files milter - Add sendmail mail filter (milter) support mime - Add MIME support minimal - Install a very minimal build (disables, for example, plugins, fonts, most drivers, non-critical features) mmap - Add mmap (memory map) support mms - Support for Microsoft Media Server (MMS) streams mng - Add support for libmng (MNG images) modplug - Add libmodplug support for playing SoundTracker-style music files modules - Build the kernel modules mono - Build Mono bindings to support dotnet type stuff motif - Add support for the Motif toolkit mozilla - Add support for the Mozilla web-browser mp3 - Add support for reading mp3 files mp4 - Support for MP4 container format mpeg - Add libmpeg3 support to various packages mpi - Add MPI (Message Passing Interface) layer to the apps that support it mplayer - Enable mplayer support for playback or encoding msn - Enable MSN Messenger IM protocol support mssql - Add support for Microsoft SQL Server database mtp - Enable support for Media Transfer Protocol mule - Add multi-language support to XEmacs multilib - On 64bit systems, if you want to be able to compile 32bit and 64bit binaries musepack - Enable support for the musepack audio codec musicbrainz - Lookup audio metadata using MusicBrainz community service (musicbrainz.org) mysql - Add mySQL Database support mysqli - Add support for the improved mySQL libraries nas - Add support for network audio sound ncurses - Add ncurses support (console display library) neXt - Enable neXt toolkit neon - Enable optimization support for ARM NEON processors netboot - Enable network booting netcdf - Enable NetCDF data format support networkmanager - Enable net-misc/networkmanager support nis - Support for NIS/YP services nls - Add Native Language Support (using gettext - GNU locale utilities) nntp - Add support for newsgroups (Network News Transfer Protocol) nocd - Install all files required to run the application without a CD mounted nptl - Enable support for Native POSIX Threads Library, the new threading module (requires linux-2.6 or better usually) nsplugin - Build plugin for browsers supporting the Netscape plugin architecture (that is almost any modern browser) ocaml - Add support/bindings for the Ocaml language ocamlopt - Enable ocamlopt support (ocaml native code compiler) -- Produces faster programs (Warning: you have to disable/enable it at a global scale) oci8 - Add Oracle 8 Database Support oci8-instant-client - Use dev-db/oracle-instantclient-basic as Oracle provider instead of requiring a full Oracle server install odbc - Add ODBC Support (Open DataBase Connectivity) offensive - Enable potentially offensive items in packages ofx - Enable support for importing (and exporting) OFX (Open Financial eXchange) data files ogg - Add support for the Ogg container format (commonly used by Vorbis, Theora and flac) openal - Add support for the Open Audio Library openexr - Support for the OpenEXR graphics file format opengl - Add support for OpenGL (3D graphics) openmp - Build support for the OpenMP (support parallel computing), requires >=sys-devel/gcc-4.2 built with USE="openmp" oracle - Enable Oracle Database support orc - Use dev-lang/orc for just-in-time optimization of array operations osc - Enable support for Open Sound Control oscar - Enable Oscar (AIM/ICQ) IM protocol support oss - Add support for OSS (Open Sound System) pam - Add support for PAM (Pluggable Authentication Modules) - DANGEROUS to arbitrarily flip pch - Enable precompiled header support for faster compilation at the expense of disk space and memory (>=sys-devel/gcc-3.4 only) pcmcia - Add support for PCMCIA slots/devices found on laptop computers pcntl - Add support for process creation functions pcre - Add support for Perl Compatible Regular Expressions pda - Add support for portable devices pdf - Add general support for PDF (Portable Document Format), this replaces the pdflib and cpdflib flags perl - Add optional support/bindings for the Perl language php - Include support for the PHP language pie - Build programs as Position Independent Executables (a security hardening technique) plasma - Build optional KDE plasma addons plotutils - Add support for plotutils (library for 2-D vector graphics) png - Add support for libpng (PNG images) policykit - Enable PolicyKit authentication support portaudio - Add support for the crossplatform portaudio audio API posix - Add support for POSIX-compatible functions postgres - Add support for the postgresql database postscript - Enable support for the PostScript language (often with ghostscript-gpl or libspectre) ppds - Add support for automatically generated ppd (printing driver) files prefix - Defines if a Gentoo Prefix offset installation is used prelude - Add support/bindings for the Prelude Intrusion Detection System profile - Add support for software performance analysis (will likely vary from ebuild to ebuild) pulseaudio - Add support for PulseAudio sound server python - Add optional support/bindings for the Python language qdbm - Add support for the qdbm (Quick Database Manager) library qmail-spp - Add support for qmail SMTP plugins qt4 - Add support for the Qt GUI/Application Toolkit version 4.x qt5 - Add support for the Qt 5 application and UI framework quicktime - Add support for OpenQuickTime radius - Add support for RADIUS authentication raw - Add support for raw image formats rdp - Enables RDP/Remote Desktop support readline - Enable support for libreadline, a GNU line-editing library that almost everyone wants recode - Enable support for the GNU recode library rss - Enable support for RSS feeds ruby - Add support/bindings for the Ruby language samba - Add support for SAMBA (Windows File and Printer sharing) sasl - Add support for the Simple Authentication and Security Layer savedconfig - Use this to restore your config from /etc/portage/savedconfig ${CATEGORY}/${PN}. Make sure your USE flags allow for appropriate dependencies scanner - Add support for scanner hardware (e.g. build the sane frontend in kdegraphics) sctp - Support for Stream Control Transmission Protocol sdl - Add support for Simple Direct Layer (media library) seamonkey - Add support for the Seamonkey web-browser seccomp - Enable seccomp (secure computing mode) to perform system call filtering at runtime to increase security of programs selinux - !!internal use only!! Security Enhanced Linux support, this must be set by the selinux profile or breakage will occur semantic-desktop - Cross-KDE support for semantic search and information retrieval session - Add persistent session support sharedmem - Add support for shared memory use shorten - Add support for the shorten audio compressor simplexml - Support for SimpleXML skey - Enable S/Key (Single use password) authentication support slang - Add support for the slang text display library (it's like ncurses, but different) slp - Add Service Locator Protocol support smartcard - Enable smartcard support smp - Enable support for multiprocessors or multicore systems sndfile - Add support for libsndfile snmp - Add support for the Simple Network Management Protocol if available soap - Add support for SOAP (Simple Object Access Protocol) sockets - Add support for tcp/ip sockets socks5 - Add support for the socks5 proxy sound - Enable sound support source - Zip the sources and install them sox - Add support for Sound eXchange (SoX) speex - Add support for the speex audio codec (used for speech) spell - Add dictionary support sqlite - Add support for sqlite - embedded sql database ssl - Add support for Secure Socket Layer connections startup-notification - Enable application startup event feedback mechanism static - !!do not set this during bootstrap!! Causes binaries to be statically linked instead of dynamically static-libs - Build static versions of dynamic libraries as well subversion - Enable subversion (version control system) support suid - Enable setuid root program, with potential security risks svg - Add support for SVG (Scalable Vector Graphics) svga - Add support for SVGAlib (graphics library) sybase - Add support for the Sybase SQL Database Server sybase-ct - Add support for Sybase-CT symlink - Force kernel ebuilds to automatically update the /usr/src/linux symlink syslog - Enable support for syslog systemd - Enable use of systemd-specific libraries and features like socket activation or session tracking sysvipc - Support for System V-compatible inter-process communication szip - Use the szip compression library taglib - Enable tagging support with taglib tcl - Add support the Tcl language tcmalloc - Use the dev-util/google-perftools libraries to replace the malloc() implementation with a possibly faster one tcpd - Add support for TCP wrappers 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 theora - Add support for the Theora Video Compression Codec threads - Add threads support for various packages. Usually pthreads tidy - Add support for HTML Tidy tiff - Add support for the TIFF image format timidity - Build with Timidity++ (MIDI sequencer) support tk - Add support for Tk GUI toolkit tokenizer - Add support for the PHP file parser truetype - Add support for FreeType and/or FreeType2 fonts uclibc - Enable uclibc specific patches and build or link uclibc udev - Enable virtual/udev integration (device discovery, power and storage device support, etc) udisks - Enable storage management support (automounting, volume monitoring, etc) unicode - Add support for Unicode upnp - Enable UPnP port mapping support upnp-av - Enable UPnP audio/video streaming support upower - Enable power management support usb - Add USB support to applications that have optional USB support (e.g. cups) v4l - Enable support for video4linux (using linux-headers or userspace libv4l libraries) vaapi - Enable Video Acceleration API for hardware decoding vala - Enable bindings for dev-lang/vala 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 vcd - Video CD support vdpau - Enable the Video Decode and Presentation API for Unix acceleration interface vhosts - Add support for installing web-based applications into a virtual-hosting environment videos - Install optional video files (used in some games) vim-syntax - Pulls in related vim syntax scripts vnc - Enable VNC (remote desktop viewer) support vorbis - Add support for the OggVorbis audio codec wayland - Enable dev-libs/wayland backend wavpack - Add support for wavpack audio compression tools wddx - Add support for Web Distributed Data eXchange webkit - Add support for the WebKit HTML rendering/layout engine webp - Add support for the WebP image format wifi - Enable wireless network functions wmf - Add support for the Windows Metafile vector image format wxwidgets - Add support for wxWidgets/wxGTK GUI toolkit x264 - Enable h264 encoding using x264 xattr - Add support for extended attributes (filesystem-stored metadata) xcb - Support the X C-language Binding, a replacement for Xlib xcomposite - Enable support for the Xorg composite extension xemacs - Add support for XEmacs xface - Add xface support used to allow a small image of xface format to be included in an email via the header 'X-Face' xft - Build with support for XFT font renderer (x11-libs/libXft) xine - Add support for the XINE movie libraries xinerama - Add support for the xinerama X11 extension, which is mandatory if you work in multiple monitors setup xinetd - Add support for the xinetd super-server xml - Add support for XML files xmlrpc - Support for xml-rpc library xmp - Enable support for Extensible Metadata Platform (Adobe XMP) xmpp - Enable support for Extensible Messaging and Presence Protocol (XMPP) formerly known as Jabber xosd - Sends display using the X On Screen Display library xpm - Add support for XPM graphics format xscreensaver - Add support for XScreenSaver extension xv - Add in optional support for the Xvideo extension (an X API for video playback) xvid - Add support for xvid.org's open-source mpeg-4 codec yahoo - Enable Yahoo Messenger IM protocol support yaz - Add in optional support for the Z39.50 Protocol for Information Retrieval (YAZ) zeroconf - Support for DNS Service Discovery (DNS-SD) zlib - Add support for zlib (de)compression zsh-completion - Enable zsh completion support