app-accessibility/gnome-speech:freetts - Adds support for the freetts speech driver
app-accessibility/freetts:jsapi - build Java Speech API (JSAPI)
app-accessibility/freetts:mbrola - Adds support for mbrola voices
app-accessibility/gnopernicus:brltty - Adds support for braille displays using brltty
app-accessibility/festival:mbrola - Adds support for mbrola voices
app-accessibility/speech-dispatcher:flite - Adds support for flite speech engine
app-admin/lcap:lids - If you have the Linux Intrusion Detection System
app-admin/bcfg2:server - Installs scripts to be used on the server-side of this app
app-admin/conky:nano-syntax - enable syntax highlighting for app-editors/nano
app-admin/conky:mpd - enable monitoring mpd controlled music media-sound/mpd
app-admin/conky:audacious - enable monitoring of audio tracks that are playing media-sound/bmpx
app-admin/conky:smapi - enable support for smapi
app-admin/conky:bmpx - enable monitoring of audio tracks that are playing media-sound/bmpx
app-admin/sdsc-syslog:beep - USe beep libraries net-libs/roadrunner
app-admin/gnome-system-tools:nfs - Adds support for NFS shares
app-admin/rsyslog:dbi - Add support for logging into various databases through dev-db/libdbi
app-admin/rsyslog:relp - Add support for the Reliable Event Logging Protocol
app-admin/syslog-ng:spoof-source - Enable support for spoofed source addresses
app-admin/testdisk:ntfs - Include the ability to read NTFS filesystems
app-admin/testdisk:reiserfs - include reiserfs reading ability
app-admin/diradm:automount - Support for automount data in LDAP
app-admin/diradm:irixpasswd - Support for storing separate IRIX passwords
app-admin/sshguard:ipfilter - Enable ipfilter firewall support (only for *bsd)
app-admin/prelude-manager:tcpwrapper - Add support for tcp_wrappers
app-admin/webalizer:xtended - Include the 404 extension
app-arch/rpm:neon - include support for neon
app-arch/rpm:file - add magic file support
app-arch/dump:ermt - encrypted rmt support
app-arch/file-roller:nautilus - Enable file-roller to integrate with gnome-base/nautilusby providing entries in its context menu.
app-arch/squeeze:toolbar - Include toolbar feature
app-arch/squeeze:pathbar - Include pathbar feature
app-backup/dar:dar64 - Enables --enable-mode=64 option, which replace infiniteby 64 bit integers
app-backup/dar:dar32 - Enables --enable-mode=32 option, which replace infiniteby 32 bit integers
app-backup/kdar:dar64 - Support libdar64.so usage
app-backup/kdar:dar32 - Support libdar32.so usage
app-backup/boxbackup:client-only - Disable server support, and just build aclient
app-backup/bacula:bacula-console - Build (GUI) console program(s)
app-backup/bacula:logwatch - Install support files for logwatch
app-backup/bacula:logrotate - Install support files for logrotate
app-backup/bacula:bacula-split-init - Use separate init scripts forfd/sd/dir
app-backup/bacula:bacula-nosd - Disable building of storage daemon in 1.38.xand later
app-backup/bacula:bacula-nodir - Disable building of director in 1.38.x andlater
app-backup/bacula:bacula-clientonly - Disable DB support, and just build aclient
app-backup/amanda:xfs - Support for backing up raw XFS filesystems usingxfsdump
app-benchmarks/jmeter:beanshell - Enable BeanShell scripting support
app-benchmarks/bootchart:acct - Enable process accounting
app-cdr/k3b:emovix - Enable burning support for eMoviX images
app-cdr/disc-cover:cdrom - Enable audio CD support. This is not needed to make  www-apps/disc-cover work.
app-cdr/cdrdao:pccts - Use dev-util/pcctsinstead of the built-insubstitution
app-cdr/cdrdao:gcdmaster - Enable building of gcdmaster application
app-cdr/cdrkit:hfs - Provide building of HFS (Apple) CD-images
app-cdr/serpentine:muine - Enable support for the GNOME music player Muine
app-cdr/xfburn:xfce - Adds integration with Xfce4 desktop environment
app-cdr/brasero:beagle - Enable app-misc/beaglesupport forsearches
app-cdr/brasero:gdl - Enable gdl support for customisable GUI
app-cdr/brasero:libburn - Enable dev-libs/libburnbackend
app-cdr/brasero:totem - Enable support for media-video/totemplaylists
app-cdr/mybashburn:normalize - Add support for normalizing audio file volumelevels
app-crypt/ccid:nousb - Disable USB support via sys-apps/pcsc-lite
app-crypt/ccid:twinserial - Enable twinserial reader
app-crypt/gnupg:openct - build using dev-libs/openctcompat
app-crypt/gnupg:ecc - Use elliptic curve cryptosystem patch
app-crypt/gnupg:idea - Use the patented IDEA algorithm
app-crypt/gnupg:pcsc-lite - build with sys-apps/pcsc-lite
app-crypt/gpgme:pth - Enable support for GNU Portable Threads multithreadinglibrary
app-crypt/ophcrack-tables:vistafree - Installs the free Vista ophcrack tables
app-crypt/ophcrack-tables:xpsmall - Installs the small free XP ophcrack tables
app-crypt/ophcrack-tables:xpfast - Installs the fast XP ophcrack tables
app-crypt/johntheripper:custom-cflags - Enables custom cflags (not supported)
app-crypt/seahorse:applet - Enable seahorse applet for gnome-base/gnome-panel.
app-crypt/seahorse:nautilus - Enable file encryption plugin to integrate into gnome-base/nautiluscontext menu.
app-crypt/seahorse:epiphany - Enable text encryption plugin to integrate into www-client/epiphanycontext menu.
app-crypt/seahorse:gedit - Enable text encryption plugin to integrate into app-editors/gedit.
app-crypt/seahorse:ldap - Enable seahorse to manipulate GPG keys on a LDAP server.
app-crypt/heimdal:otp - Enable support for one-time passwords (OTP) in someheimdal apps
app-crypt/heimdal:pkinit - Enable pkinit support to get the initial ticket
app-crypt/ophcrack:ophsmall - Makes use of smaller cracking tables
app-dicts/stardict:festival - Enable text to speech synthesizer using festival engine
app-dicts/stardict:qqwry - Enable QQWry plugin, which provides information (in Chinese language) about geographical positions, owner, etc. for IP addresses
app-dicts/stardict:espeak - Enable text to speech synthesizer using espeak engine
app-dicts/stardict:pronounce - Install WyabdcRealPeopleTTS package (it is just many .wav files) to make StarDict pronounce English words
app-dicts/stardict:gucharmap - Enable gucharmap dictionary plugin
app-dicts/aspell-be:classic - Support classic spelling by default
app-doc/pms:kdebuild - Include specification for the kdebuild EAPI, seehttp://www.gentoo.org/proj/en/desktop/kde/kdebuild-1.xml
app-doc/pms:html - Generate PMS as .html as well
app-doc/pms:all-options - Include both sides of kdebuild conditionals,shown in different colours (PDF only)
app-doc/doxygen:nodot - removes graphviz dependency, along with dot graphs
app-doc/linuxfromscratch:htmlsingle - Also install all-in-one-page HTML version
app-doc/gimp-help:webinstall - optimize images for web installation (fewer colors,depends on media-gfx/imagemagick)
app-editors/cssed:plugins - Install plugin development files
app-emacs/emhacks:jde - Enable support for Java Development Environment.  This requires packages app-emacs/jde (and app-emacs/cedet).
app-misc/beagle:firefox - Compiles and installs the extension for either www-client/mozilla-firefoxor www-client/mozilla-firefox-bin. This extension helpsBeagle index the websites you visit.
app-misc/beagle:ole - Enables OLE (Object Linking and Editing) support via dev-dotnet/gsf-sharp, app-text/wv, and app-office/gnumeric(ssindex). These allow Beagle to index MS Powerpoint, Word, and Spreadsheet Documents.
app-misc/beagle:xscreensaver - Allow Beagle to detect when the screensaver isswitched on. This allows Beagle to use more resources and index fasterwhen the computer is not in use.
app-misc/beagle:doc - Builds programmer documentation for Beagle using app-doc/monodoc.
app-misc/beagle:gtk - Enables the GTK+ Beagle Search UI for showing searchresults. This is the default GUI for Beagle.
app-misc/beagle:thunderbird - Compiles and installs the extension for either mail-client/mozilla-thunderbirdor mail-client/mozilla-thunderbird-bin. This extension helpsBeagle index your mails.
app-misc/beagle:chm - Enables support for indexing of the MS CHM (Compressed HTML)file format using app-doc/chmlib.
app-misc/beagle:eds - Enables Beagle to index the Addressbook and Calendar from mail-client/evolutionstored in gnome-extra/evolution-data-server. The information isaccessed using dev-dotnet/evolution-sharp.
app-misc/beagle:epiphany - Compiles and installs the extension for either www-client/epiphany. This extension helps Beagle index thewebsites you visit.
app-misc/beagle:galago - Allows Beagle to get status information fromapplications such as Pidgin to show in the search results.
app-misc/beagle:debug - Enables debug XML dumps of all messages passed betweenthe daemons and the UIs. WARNING, this option will fill up your BeagleLog directory very quickly.
app-misc/beagle:pdf - Enables support for indexing of the PDF (Portable DocumentFormat) file format using `pdfinfo` and `pdftotext` from app-text/poppler
app-office/gnumeric:python - Enable python plugin loader.
app-office/gnumeric:gnome - Allow Gnumeric to use GNOME specific extensions.
app-office/gnumeric:perl - Enable perl plugin loader.
app-text/enchant:zemberek - Adds support for app-text/zemberek-serverspell checker server
app-text/enchant:aspell - Adds support for app-text/aspellspell checker
app-text/enchant:hunspell - Adds support for app-text/hunspellspell checker
dev-games/ode:nogyroscopic - disable gyroscopic term maybe improving stability
dev-games/ode:double-precision - more precise calculations at the expense of speed
dev-games/ode:noopcode - disable OPCODE (trimesh support)
dev-games/ogre:cegui - build the CEGUI samples
dev-games/ogre:double-precision - more precise calculations at the expense of speed
dev-games/ogre:devil - image loading support with DevIL
dev-games/ogre:cg - NVIDIA toolkit plugin
dev-games/cegui:devil - Enable image loading via DevIL
dev-games/cegui:xerces-c - Enable the Xerces-C++ XML parser module
dev-games/cegui:irrlicht - Enable the Irrlicht renderer
dev-games/crystalspace:cegui - include support for Crazy Eddie GUI
dev-games/crystalspace:cg - NVIDIA toolkit plugin
dev-games/crystalspace:cal3d - include support for skeleton animation
dev-games/crystalspace:ode - include support for Open Dynamics Engine
dev-games/crystalspace:3ds - Enables support for .3DS files in CrystalSpace
dev-games/guichan:allegro - Build the Allegro frontend
dev-libs/libcdio:minimal - Only build the libcdio library and little more, just to be used to    link against from multimedia players. With this USE flag enabled,    none of the command-line utilities are built, nor is the CDDA library.
dev-libs/xerces-c:threads - Enable threading support through pthread (or otherlibraries on AIX, IRIX, HPUX, Solars). Highly recommended.
dev-libs/xerces-c:iconv - Use iconv as message loader and transcoder (in general itwould be possible to use iconv only as message loader and something elselike icu or the native method as transcoder and vice-versa, but this is aless common case and hard to handle).
dev-libs/xerces-c:libwww - Use the libwww library for fetching URLs, insteadof the builtin method.
dev-libs/xerces-c:icu - Use ICU as message loader and transcoder. ICU supports over180 different encodings and/or locale specific message support.
games-action/d1x-rebirth:demo - Use the demo data instead of the full game
games-action/d1x-rebirth:mpu401 - Enable MPU401 music support
games-action/d1x-rebirth:mixer - Enable mixer support
games-action/d1x-rebirth:awe32 - Enable AWE32 support
games-action/d2x-rebirth:mpu401 - Enable MPU401 music support
games-action/d2x-rebirth:awe32 - Enable AWE32 support
games-action/xshipwars:yiff - Add support for the YIFF sound server
games-arcade/ultrastar-ng:novideo - Disable smpeg video support
games-arcade/ultrastar-ng:songs - Build with few demo songs
games-arcade/bomns:editor - enables building the level editor
games-arcade/stepmania:force-oss - force using OSS
games-arcade/lbreakout2:themes - Install additional themes
games-arcade/triplexinvaders:psyco - psyco python accelerator
games-board/pysol:extra-cardsets - Install extra cardsets
games-board/crafty:no-opts - Don't try to enable crazy CFLAG options
games-board/grhino:gtp - Install the GTP (Go/Game Text Protocol) frontend
games-board/freedoko:altenburgcards - Use the Altenburg card set
games-board/freedoko:net - Enable network game support
games-board/freedoko:xskatcards - Use the XSkat card set
games-board/freedoko:pysolcards - Use the PySol card set
games-board/freedoko:kdecards - Use the KDE card set
games-board/xboard:zippy - Enable experimental zippy client
games-board/chessdb:tb4 - Install 4 pieces table bases
games-emulation/xmame:net - Add network support
games-emulation/xmess:net - Add network support
games-emulation/zsnes:custom-cflags - Enables custom cflags (not supported)
games-emulation/generator:sdlaudio - Enable SDL Audio
games-emulation/snes9x:netplay - Enable playing ROMs over the network (not recommended)
games-engines/scummvm:fluidsynth - compile with support for fluidsynth
games-fps/rott:demo - Install the shareware version
games-fps/darkplaces:textures - Install and setup the updated textures
games-fps/darkplaces:demo - Uses the demo data from quake1 (quake1-demodata)
games-fps/darkplaces:cdsound - Enables using CD audio in the engine
games-fps/darkplaces:lights - Install and setup the updated light maps
games-fps/darkplaces:dpmod - Sets up the darkplaces mod from icculus
games-fps/doom3:roe - Adds support for the Resurrection of Evil expansion
games-fps/qudos:textures - Install the enhanced textures (quake2-textures)
games-fps/qudos:demo - Install the demo files (quake2-demodata) and configure for use
games-fps/qudos:mods - Build support for the quake2 mission packs
games-fps/qudos:qmax - Build the pretty version (quake max)
games-fps/quake3-bin:teamarena - Adds support for Team Arena expansion pack
games-fps/worldofpadman:maps - Install extra maps (PadPack)
games-fps/unreal-tournament-goty:S3TC - Add the extra fancy textures to UT ... only works on certain cards (nvidia/ati/s3)
games-fps/duke3d:demo - Install the demo files
games-fps/freedoom:doomsday - Add wrapper to run it within doomsday
games-fps/nexuiz:maps - Install the community map pack
games-fps/quake3:teamarena - Adds support for Team Arena expansion pack
games-fps/quake2-icculus:demo - Install the demo files (quake2-demodata) and configure for use
games-fps/quake2-icculus:noqmax - Do not build the pretty version (quake max)
games-fps/quake2-icculus:rogue - Build support for the 'Ground Zero' Mission Pack (rogue)
games-fps/quake2-icculus:xatrix - Build support for the 'The Reckoning' Mission Pack (xatrix)
games-fps/quake2-icculus:qmax - Build the pretty version (quake max)
games-fps/ezquake-bin:security - install the security module needed for some servers
games-fps/warsow:irc - Enable IRC support
games-fps/doom-data:doomsday - Add wrapper to run it within doomsday
games-kids/gcompris:gnet - will let GCompris fetch content from a web server
games-mud/mmucl:mccp - adds support for the Mud Client Compression Protocol
games-rpg/nwn:hou - Install the Hordes of the Underdark expansion pack
games-rpg/nwn:sou - Installs the Shadows of Undrentide expension pack
games-rpg/nwn-data:nowin - For those people who cant grab the 1.2 gigs of data files from a windows partition
games-rpg/nwn-data:hou - Install the Hordes of the Underdark expansion pack
games-rpg/nwn-data:sou - Installs the Shadows of Undrentide expension pack
games-rpg/nwn-cep:hou - Adds support for the Hordes of the Underdark expansion pack
games-rpg/nwn-cep:sou - Adds support for the Shadows of Undrentide expension pack
games-rpg/galaxymage:psyco - psyco python accelerator
games-rpg/eternal-lands-data:sound - Install optional sound files (extra 40 meg)
games-rpg/eternal-lands-data:music - Install optional music files (extra 30 meg)
games-simulation/singularity:music - Install music files
games-sports/xmoto:editor - Depend on inkscape, scripts to convert svg to level (svg2lvl)
games-strategy/x2:langpacks - Install additional language packs
games-strategy/x2:dynamic - Use dynamic binaries instead of static
games-strategy/x2:modkit - Install the modkit
games-strategy/x2:bonusscripts - Add bonus scripts
games-strategy/uqm:remix - download and install music remix files (large)
games-strategy/uqm:voice - download and install voice files (large)
games-strategy/uqm:music - download and install music files (large)
games-strategy/freelords:editor - Installs optional map editor
games-strategy/freeciv:auth - Add authentication capability
games-strategy/dark-oberon:fmod - Add sound support (fmod)
games-strategy/heroes3:maps - Installs optional map data
games-strategy/heroes3:sounds - Installs optional sound data
games-strategy/heroes3:music - Installs optional music data
games-strategy/wesnoth:lite - Lite install
games-strategy/wesnoth:tools - Enable compilation of translation tools
games-strategy/wesnoth:editor - Enable compilation of map editor
games-strategy/wesnoth:server - Enable compilation of server
gnome-base/gnome-volume-manager:automount - Enable support for automounting devices that arehandled by gnome-base/nautilussince 2.22. This should me off onmost Gnome systems.
mail-client/balsa:crypt - Adds support for GnuPG encryption
mail-client/balsa:rubrica - Adds support for app-office/rubricaaddressbook
mail-client/evolution:profile - Build support for profiling Evolution fordevelopment purposes
mail-client/evolution:spell - Enable spell-checking support using app-text/gnome-spell
mail-client/evolution:hal - Enable support for auto-detection of inserted iPods andsyncing data with them using sys-apps/hal
mail-client/evolution:crypt - Enable GPG encryption support using app-crypt/gnupgand app-crypt/pinentry
mail-client/evolution:dbus - Allow the Mail Notification plugin to notify you aboutnew messages via an icon in the tray using sys-apps/dbus
mail-client/evolution:ldap - Enable support for fetching contacts from an LDAP orActive Directory server using net-nds/openldap
mail-client/evolution:mono - Build the dev-lang/monoplugins included inEvolution
mail-client/evolution:networkmanager - Allows Evolution to automagically toggleonline/offline mode by talking to net-misc/networkmanagerand getting the current network state
mail-client/evolution:pda - Enable support for syncing Evolution Calendar andAddressbooks with PDAs using app-pda/gnome-pilotand app-pda/gnome-pilot-conduit
media-libs/libvorbis:aotuv - Applies the aoTuV patches. Aoyumi's Tuned Vorbis is a third-party patchset that improves the vorbis encoding quality.A previous version of the aoTuV patchset has already been merged with the official libvorbis release. The current patchset especially improves encoding quality at low bitrate settings, and is very likelyto be merged at some point in the future. It is recommended that all users enable this useflag.
media-libs/xine-lib:real - Enable support for loading and using RealPlayer binary codecs on x86 and    amd64 Linux. Enabling this USE flag might make the package    non-redistributable in binary form.
media-libs/xine-lib:imagemagick - Build the ImageMagick-based image decoder plugin.
media-libs/xine-lib:gnome - Build the gnome-base/gnome-vfsbased input plugin. This plugin is    used to access any resource that can be accessed through Nautilus's (and    others') URLs.
media-libs/xine-lib:truetype - Use media-libs/freetypefor font rendering and media-libs/fontconfigfor font discovery. Enabling this USE flag    will allow OSD (such as subtitles) to use more advanced font and to more    easily select which font to use. The support for TrueType fonts in xine-lib    is still experimental, and might not be as good looking as the bitmap fonts    used with this USE flag disabled.
media-libs/xine-lib:mmap - Use mmap() function while reading file from local disks. Using mmap() will    use more virtual memory space, but leaves to the Kernel the task of caching    the file's data. mmap() access should be faster, but might misbehave if the    device where the file resides in is removed during playback.
media-libs/xine-lib:gtk - Build the gdkpixbuf-based image decoder plugin.
media-libs/xine-lib:mad - Build the media-libs/libmadbased mp3 decoder. This mp3 decoder    has superior support compared to the one coming from FFmpeg that is used as    a fallback. If you experience any bad behaviour with mp3 files (skipping,    distorted sound) make sure you enabled this USE flag.
media-libs/xine-lib:flac - Build the media-libs/flacbased FLAC demuxer and decoder. This    flag is not needed for playing FLAC content, neither standalone nor in Ogg    container (OggFLAC), but might have better support for exotic features like    24-bit samples or 96kHz sample rates.
media-libs/xine-lib:win32codecs - Enable support for loading and using Windows 32-bit binary codecs on x86    Linux and FreeBSD. Enabling this USE flag might make the package    non-redistributable in binary form.
media-sound/amarok:python - Install the Amarok scripts written in Python, depending on dev-python/PyQt. At the moment the only script      installed by this flag is the webcontrol script.
media-sound/amarok:real - Build the Helix engine for Amarok, linked against media-video/realplayer. This is an alternative engine      to the xine one, which supports a different set of formats. Only      available for x86 architecture as it uses the binary version of      RealPlayer. Plase note that by enabling this USE flag, the resulting      package will not be redistributable, as it links to the non-GPL compatible      RealPlayer.
media-sound/amarok:mp4 - Build the TagLib plugin for writing tags in Mp4 container files      (m4a). Please note that by enabling this USE flag, the resulting      package will not be redistributable, as it links to media-libs/libmp4v2, distributed under a      GPL-incompatible license.
media-sound/amarok:daap - Enable the scripts for music sharing through DAAP. This flag      adds dependencies on www-servers/mongrelto allow      sharing of the Amarok music collection through DAAP      protocol. Please note that turning this flag off has no effect      on DAAP browsing.
media-sound/pulseaudio:glib - Add support to dev-libs/glib-based mainloop for the    libpulse client library, to allow using libpulse on glib-based    programs.
media-sound/pulseaudio:X - Build the X11 publish module to export PulseAudio information    through X11 protocol for clients to make use. Don't enable this    flag if you want to use a system wide instance. If unsure, enable    this flag.
media-sound/pulseaudio:oss - Enable OSS sink/source (output/input). Also build the padsp    script to make OSS software use PulseAudio.
media-sound/pulseaudio:policykit - Use the PolicyKit framework ( sys-auth/policykit) to    acquire high-priority and real-time scheduling for the daemon.
media-sound/pulseaudio:gnome - Use GConf to store user preferences on streams and so on. Don't    enable this flag if you want to use a system wide instance. If    unsure, enable this flag.
media-tv/mythtv:xvmc - Instructs MythTV to use XvMC for it's video output. Bydefault, this will use the generic XvMC wrapper unless a specific videocard driver is enabled via their VIDEO_CARDS USE flags.
media-tv/mythtv:backendonly - Allows one tobuild only the backend and it's components. This is not a supportedconfiguration any long and will be removed in future versions. It's alsoknown that it does not compile all the addon programs that the backendmay use.
media-tv/mythtv:perl - Builds the perl bindings for MythTV. Allows you to writescripts in Perl to control your MythTV setup or communicate withit.
media-tv/mythtv:ivtv - Adds support for ivtv based cards. Typically these areHauppauge cards which output analog TV directly in MPEG2 format.Essentially, hardware encoding of analog TV.
media-tv/mythtv:video_cards_i810 - When combined with the xvmc USE flag, enablesIntel specific XvMC extension usage.
media-tv/mythtv:vorbis - Adds support for the Vorbis container format toMythTV.
media-tv/mythtv:directv - Installs the DirecTV channel changing script so thatyou can configure MythTV to use it to change the channels on yourDirecTV box.
media-tv/mythtv:video_cards_nvidia - When combined with the xvmc USE flag,enables NVIDIA specific XvMC extension usage.
media-tv/mythtv:mmx - Builds ffmpeg's codec libraries with mmx support.
media-tv/mythtv:altivec - Builds ffmpeg's codec libraries with altivecsupport.
media-tv/mythtv:crciprec - describe
media-tv/mythtv:opengl - Builds MythTV with support for using OpenGL as theoutput painter rather then Qt3 built in painter.
media-tv/mythtv:freebox - describe
media-tv/mythtv:ieee1394 - Allows MythTV to communicate and use Firewire enabledCable boxes. These are typically found in the United States, where suchsupport is required by law. This will also install Firewire testprograms and external channel changers if the internal changer does notwork.
media-tv/mythtv:autostart - Uses a custom autostart configuration gleened fromexpierence with MythTV since it's early versions and discussed withother MythTV maintainers and users. Does not rely on KDE being installedlike most methods do.
media-tv/mythtv:lirc - Adds LIRC support directly to MythTV allowing for built incontrol via a LIRC device.
media-tv/mythtv:alsa - Allows MythTV to directly output sound to ALSA devices,this is needed if you are using ALSA dmix or SPDIF. Note, you will haveto physically type your device into the MythTV configuration since itwill only give you /dev/dsp devices in the drop down.
media-tv/mythtv:video_cards_via - When combined with the xvmc USE flag, enablesVIA specific XvMC extension usage.
media-tv/mythtv:hdhomerun - Allows MythTV to communicate to HDHomeRun devices andreceive your TV input from those sources.
media-tv/mythtv:debug - Instructs Qt to use the 'debug' target instead of'release' target. If your MythTV is crashing or you need a backtrace,you need to compile it with this option otherwise the debugging data isuseless.
media-tv/mythtv:lcd - Tells MythTV that you have an instance of app-misc/lcdprocconfigured on your machine and it shouldoutput information such as current time, show name, episode name, etc tothat LCD.
media-tv/mythtv:jack - Allows MythTV to use JACK as your sound output device. Youwill have to manually configure the path to your JACK settings.
media-tv/mythtv:dvd - Adds support for MythTV's internal player to support mediafiles found on DVDs. You still need media-plugins/mythdvdinstalled to play DVDs from MythTV.
media-tv/mythtv:dbox2 - describe
media-tv/mythtv:dvb - Enables support for Linux DVB cards. These include allcards that work with digital signals such as ATSC, DVB-T, DVB-C, andDVB-S, QAM-64, and QAM-256.
media-tv/mythtv:frontendonly - Allows one tobuild only the frontend and it's components. This is not a supportedconfiguration any long and will be removed in future versions. It's alsoknown that it does not compile all the addon programs that the frontendmay use.
media-tv/mythtv:dts - Enables the support of DTS sound from DVDs.
media-tv/mythtv:joystick - Allows you to configure MythTV to be controlled by ajoystick rather then a remote or keyboard.
media-video/totem:python - Build support for dev-lang/pythonplugins
media-video/totem:seamonkey - same as nsplugin description but build against www-client/seamonkey
media-video/totem:bluetooth - Enable support for user-presence detection via theuser's bluetooth handset using net-wireless/bluez-libs
media-video/totem:nsplugin - Build media plugin for Mozilla-based browsers such as www-client/mozilla-firefox
media-video/totem:nvtv - Enable support for TV-output with media-tv/nvtv
media-video/totem:tracker - Enable support for searching media files using theindexer app-misc/tracker
media-video/totem:xulrunner - same as nsplugin description but build against net-libs/xulrunner
media-video/totem:galago - Allow Totem to set your IM client to "away" when a movieis playing in fullscreen using dev-libs/libgalago
media-video/totem:lirc - Enable support for controlling Totem with a remote controlusing app-misc/lirc
net-im/gossip:debug - Enable debug path in gossip. net-libs/loudmouthneeds to be compiled with USE="debug" toallow Gossip to actually build the debug code path.
net-im/gossip:gnome-keyring - Allows Gossip to use gnome-keyring to store passwords.
net-im/gossip:libnotify - Allows Gossip to show visual notifications concerningvarious activities via libnotify.
net-irc/rbot:toilet - Add dependency over app-misc/toilet, which is used by    the "figlet" plugin for rbot. If the USE flag is disabled the    plugin will be unable to use toilet; if figlet is also disabled,    the plugin will be disabled.
net-irc/rbot:nls - Build and install translation for the messages coming from the bot    and its plugins (through dev-ruby/ruby-gettext).
net-irc/rbot:aspell - Use aspell instead of ispell in the "spell" plugin for rbot. The    vanilla plugin uses ispell, but enabling this flag makes it use    the ispell interface from aspell instead.
net-irc/rbot:fortune - Add dependency over games-misc/fortune-mod, which is    needed to enable the "fortune" plugin for rbot. If the USE flag is    disabled the plugin is also disabled by default.
net-irc/rbot:translator - Add dependency over dev-ruby/mechanize, which is needed    to enable the "translator" plugin for rbot. If the USE flag is    disabled the plugin is also disabled by default.
net-irc/rbot:shorturl - Add dependency over dev-ruby/shorturl, which is needed    to enable the "shortenurl" plugin for rbot. If the USE flag is    disabled the plugin is also disabled by default.
net-irc/rbot:host - Add dependency over net-dns/bind-tools(providing    /usr/bin/host), which is needed to enable the "host" plugin for    rbot. If the USE flag is disabled the plugin is also disabled by    default.
net-irc/rbot:dict - Add dependency over dev-ruby/ruby-dict, which is needed    to enable the "dict" plugin for rbot. If the USE flag is disabled    the plugin is also disabled by default.
net-irc/rbot:hunspell - Use hunspell instead of ispell in the "spell" plugin for rbot. The    vanilla plugin uses ispell, but enabling this flag makes it use    the ispell interface from hunspell instead. It's overridden by the    aspell USE flag. For native hunspell support check the    rbot-hunspell plugin.
net-irc/rbot:cal - Add dependency over a package providing the /usr/bin/cal command,    which is needed to enable the "cal" plugin for rbot. If the USE    flag is disabled the plugin is also disabled by default.
net-irc/rbot:timezone - Add dependency over dev-ruby/tzinfoto enable the "time"    plugin for rbot. If the USE flag is disabled the plugin is also    disabled by default.
net-irc/rbot:figlet - Add dependency over app-misc/figlet, which is used by    the "figlet" plugin for rbot. If the USE flag is disabled the    plugin will be unable to use figlet; if toilet is also disabled,    the plugin will be disabled.
net-irc/quassel:X - Build the Qt 4 GUI client for quassel. If this USE flag is      disabled, the GUI is not built, and cannot be used. You might      want to disable this on the server, but you need it enabled on      the client.
net-irc/quassel:server - Build the server binary. If this USE flag is disabled, the      'core' server binary for quassel is not built, and cannot be      used. You need this enabled on the server, but you might want to      disable it on the client.
net-libs/libesmtp:ssl - Enable support for advanced SMTP authentication methods, like NTML    and STARTTLS. Also use OpenSSL's MD5 implementation over internal    version.
net-misc/mediatomb:taglib - Use media-libs/taglibfor reading files' metadata    rather than id3lib. If this USE flag is disabled media-libs/id3libis used in its stead.
net-misc/mediatomb:mysql - Use dev-db/mysqlas backend rather than SQLite3. If    this USE flag is disabled, dev-db/sqliteis used in its    stead.
net-news/liferea:gtkhtml - Uses the gtkhtml rendering engine for item rendering.  Depricated,and broken on amd64.
net-news/liferea:dbus - Enables the DBUS connector for liferea, so feeds can be managed fromexternal programs
net-news/liferea:libnotify - Enable popup notifications
net-news/liferea:lua - Enable lua scripting
net-news/liferea:xulrunner - Enable the xulrunner 1.9 rendering engine for item rendering
net-news/liferea:networkmanager - Enable NetworkManager integration to automatically detectonline/offline status
net-news/liferea:webkit - Enable the webkit rendering engine for item rendering
net-news/liferea:gnutls - Enable https feeds using gnutls
sci-visualization/hippodraw:fits - Enable HippoDraw's built-in support for reading FITS files,    by using the CFITSIO library. FITS binary and ASCII tables are    supported as well as images. When combine with numpy flag, it can    also use the pyfits package.
sci-visualization/hippodraw:root - Adds support for ROOT input/ouput system, storing a table of data    as TBranch objects each with a single TLeaf. Files of this type    can be imported by HippoDraw as a RootNTuple. Also if root flag is    selected, it can use root::minuit for minimization instead of    standalone minuit library.
sci-visualization/hippodraw:wcs - Adds 10 built-in transforms to HippoDraw via the World Coordinate    System library for FITS files.
sci-visualization/hippodraw:numpy - Enable support for the numerical array manipulation and    computational capabilities of numpy in python.    HippoDraw can return a numerical array to Python from any of the type    of objects that are supported. One can also import data    to a HippoDraw from a numpy array.
sci-visualization/hippodraw:numarray - Enable support for the obsolete numerical python array package    numarray. Should not be used, since it's being deprecated.    See bug #, and switch to numpy.
sys-apps/hal:crypt - Allows HAL to mount volumes that are encrypted usingLUKS. sys-fs/cryptsetup-lukswhich has recently been renamedto sys-fs/cryptsetupallows you to create such encryptedvolumes. HAL will be able to handle volumes that are removable orfixed.
sys-apps/hal:dell - Builds an installs the Dell addon, which reads data fromthe Dell SM BIOS via sys-libs/libsmbios. It will read yourservice tag information and your hardware backlight data as well asallow you to modify the backlight settings on a Dell laptop.
sys-apps/hal:selinux - Installs SELinux policies and links HAL to the SELinuxlibraries.
sys-apps/hal:doc - Generates documentation that describes HAL's fdiformat.
sys-apps/hal:pcmcia - Allows HAL to process PCMCIA/CardBus slot data whichincludes inserts and removals and act on these events.
sys-apps/hal:disk-partition - Allows HAL to use libparted from sys-apps/partedto read raw partition data from your disksand process that data. Future versions of HAL (possibly 0.5.11 andhigher) will allow you to create, modify, delete and format partitionsfrom a GUI interface agnostic of your desktop environment.
sys-apps/hal:acpi - Enables HAL to attempt to read from /proc/acpi/event, ifunavailable, HAL will read events from sys-power/acpid. Ifyou need multiple acpi readers, ensure acpid is in your defaultrunlevel (rc-update add acpid default) along with HAL. This will alsoenable HAL to read Toshiba and IBM acpi events which do not get sentvia /proc/acpi/event
sys-auth/pambase:mktemp - Enable pam_mktemp module on system auth stack for session      handling. This module creates a private temporary directory for      the user, and sets TMP and TMPDIR accordingly.
sys-auth/pambase:gnome-keyring - Enable pam_gnome_keyring module on system login stack. This      enables proper Gnome Keyring access to logins, whether they are      done with the login shell, a Desktop Manager or a remote login      systems such as SSH.
sys-auth/pambase:consolekit - Enable pam_ck_connector module on local system logins. This      allows for console logins to make use of ConsoleKit      authorization.
sys-auth/pambase:ssh - Enable pam_ssh module on system auth stack for authentication      and session handling. This module will accept as password the      passphrase of a private SSH key (one of ~/.ssh/id_rsa,      ~/.ssh/id_dsa or ~/.ssh/identity), and will spawn an ssh-agent      instance to cache the open key.
sys-auth/pambase:debug - Enable debug information logging on syslog(3) for all the      modules supporting this in the system authentication and system      login stacks.
sys-auth/pambase:passwdqc - Enable pam_passwdqc module on system auth stack for password      quality validation. This is an alternative to pam_cracklib      producing warnings, rejecting or providing example passwords      when changing your system password. It is used by default by      OpenWall GNU/*/Linux and by FreeBSD.
sys-auth/pambase:cracklib - Enable pam_cracklib module on system authentication stack. This      produces warnings when changing password to something easily      crackable. It requires the same USE flag to be enabled on sys-libs/pamor system login might be impossible.
