app-arch/p7zip:rar - Enable support for non-free rar decoder
app-cdr/k3b:emovix - Enable burning support for eMoviX images
app-laptop/kthinkbat:smapi - Use extended ThinkPad battery info exported via SMAPI BIOS by app-laptop/tp_smapi
app-office/kword:wpd - Build wordperfect document support.
app-office/kword:wv2 - Build MS-Word .doc support.
media-gfx/krita:kdcraw - Enable KDE image manipulating interface.
media-gfx/krita:gmm - Enable library for sparse, dense and skyline matrices.
app-office/kmymoney2:hbci - Add HBCI online banking support
app-office/kmymoney2:qtdesigner - Installs KMyMoney specific widget library for Qt-designer
app-office/kspread:solver - Use solver extension for solving lingebra and others.
app-text/poppler:exceptions - Enable exceptions throwing.
app-text/poppler:abiword -  Enable support for app-office/abiword output. Requires dev-libs/libxml2. 
app-text/poppler:utils -  Install command-line PDF converters and various utilities. 
app-text/poppler:xpdf-headers - Install xpdf headers.
dev-db/hk_classes:mdb - Enables Microsoft Access DB support
dev-db/hk_classes:xbase - Enables support for xbase databases (dBase, FoxPro, etc.)
dev-util/kdevelop:cmake - Support for the CMake Build System.
dev-util/kdevelop:sql - Support for the Structured Query Language (SQL).
dev-util/kdevelop:perforce - Support for the Perforce version control system.
dev-util/kdevelop:pascal - Support for the Pascal programming language.
dev-util/kdevelop:haskell - Support for the Haskell programming language.
dev-util/kdevelop:qmake - Support for the QMake Build System.
dev-util/kdevelop:ada - Support for the Ada programming language.
dev-util/kdevelop:clearcase - Support for the ClearCase version control system.
kde-base/kttsd:akode - Support for the aKode audio-decoding frame-work.
kde-base/kpilot:avantgo - Add support for syncing Avantgo accounts
kde-base/kdeutils-meta:floppy - Install kfloppy to format and create DOS or ext2fs filesystems in a floppy.
kde-base/kbugbuster:kcal - Support for kcal (calendar) format
kde-base/kig:kig-scripting - Support Python scripting
kde-base/kdegraphics-meta:povray - Install kde-base/kpovmodeler, which needs POV-Ray
kde-base/kopete:winpopup - Enable pop-up messages sending on windows. (same as good old "net send" messages ;])
kde-base/kopete:jabber - Enable XMPP protocol handler (this is also gmail).
kde-base/kopete:addbookmarks - Automaticaly add incoming urls to bookmarks.
kde-base/kopete:webpresence - Show your status and some more informations on web.
kde-base/kopete:statistics - Everybody loves statistic graphs, especialy cake ones. ;]
kde-base/kopete:sms - Enable the sms sending plugin.
kde-base/kopete:autoreplace - Automaticaly replace selected text
kde-base/kopete:msn - Enable "Windows live messenger" protocol support.
kde-base/kopete:sametime - Enables support for the Sametime protocol for instant messaging
kde-base/kopete:irc - Enable the IRC protocol handler.
kde-base/kopete:groupwise - Enable the Groupwise protocol handler.
kde-base/kopete:yahoo - Enable yahoo protocol support.
kde-base/kopete:translator - Translate incoming and outgoing messages.
kde-base/kopete:contactnotes - Enables writing personal notes for contacts.
kde-base/kopete:nowlistening - Shows song you currently listen to in your status/etc. Bindings for many players.
kde-base/kopete:latex - Embed latex formatted text into messages.
kde-base/kopete:texteffect - Various fancy text effects for your messages (dont ever consider writing us with this enabled ;]).
kde-base/kopete:connectionstatus - Builds Connection Status plugin
kde-base/kopete:highlight - Allows you to specify highlights on specific events.
kde-base/kopete:alias - Enables creating of your own aliases for commands.
kde-base/kopete:emoticons-manager - Enables emoticons theme manager so that the user can edit and remove emoticons or add custom ones etc
kde-base/kopete:gadu - Enable the Gadu protocol handler.
kde-base/kopete:netmeeting - Builds netmeeting plugin (require gnomemeeting)
kde-base/kopete:history - Enables saving chat history.
kde-base/kdepim-meta:kitchensync - Include the kitchensync package
kde-base/kdm:consolekit - Enables support for authorization using consolekit
kde-base/krdc:rdp - Enable runtime dependency for net-misc/rdesktop
kde-base/kalzium:editor - Enable the embedded molecule editor/viewer
kde-base/kalzium:solver - Enable the equation solver
kde-base/kcontrol:logitech-mouse -  Build the Control Center module to configure logitech mice 
kde-base/kmilo:pbbuttonsd - Support for the Apple PMU daemon pbbuttonsd
kde-base/kaddressbook:gnokii - Address synchronization with mobile phones via app-mobilephone/gnokii
kde-frameworks/kdelibs:legacyssl - Support for some deprecated ciphers. Don't use this flag unless you really need it
kde-frameworks/kdelibs:utempter - Records user logins. Useful on multi-user systems
kde-base/kdeadmin-meta:lilo - Install lilo-config, a frontend for the lilo boot loader
kde-base/kdvi:kpathsea - Enable integration with kpathsea search library (TeX related)
kde-base/arts:artswrappersuid - Set artswrapper suid for realtime playing, which is a security hazard
kde-base/kdeartwork-kscreensaver:eigen - Enable various aritmethic screensavers which use Eigen2 for computations.
kde-base/konqueror:bookmarks -  Add dependency on bookmark package. 
kde-base/konqueror:thumbnail -  Enables video thumbnails generation for kde-base/konqueror file manager. 
kde-base/konqueror:auth -  Add dependency on authentization packages. 
kde-base/juk:akode - Support for the aKode audio-decoding frame-work
kde-misc/ksensors:ibmacpi - Enable monitoring of ACPI sensor data on IBM Thinkpad notebooks
kde-misc/knetworkmanager:pptp - Adds support for the PPTP (PPP) VPN client
kde-misc/knetworkmanager:dialup - Enables Dialup (PPP) support
kde-misc/knetworkmanager:cisco - Adds support for the Cisco VPN client net-misc/vpnc
kde-misc/knetworkmanager:openvpn - Adds support for the OpenVPN net-misc/openvpn client
media-gfx/digikam:nfs - Create sqlite db within ~/.kde, instead in the albums base directory.
media-gfx/gwenview:kipi -  Support for the KDE Image Plugin Interface. 
media-gfx/showimg:kipi -  Support for the KDE Image Plugin Interface. 
media-plugins/kipi-plugins:linguas_zn_CN - Add zn_CN lingua suppport
media-sound/rosegarden:dssi - Enable support for DSSI Soft Synth Interface
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. Please 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:njb - Enable support for NJB (Creative) devices access through libnjb
media-sound/amarok:ifp - Enable support for iRiver devices access through libifp
media-sound/amarok:daap -  Enable the scripts for music sharing through DAAP. This flag adds dependencies on www-servers/mongrel to 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/amarok:visualization -  Support visualization plugins through media-libs/libvisual 
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: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:amazon - Enable support for downloading covers from amazon.com
media-sound/amarok:mp3tunes - Enable mp3tunes integration
media-sound/amarok:lastfm - Enable Last.fm streaming services support through media-libs/liblastfm
media-tv/kdetv:zvbi - Enable VBI Decoding Library for Zapping
media-video/kmplayer:npp - Compile the npp backend that plays xembed style browser plugins.
net-dns/avahi:bookmarks - Install the avahi-bookmarks application (requires dev-python/twisted)
net-dns/avahi:mdnsresponder-compat - Enable compat libraries for mDNSResponder
net-dns/avahi:autoipd - Build and install the IPv4LL (RFC3927) network address configuration daemon
net-dns/avahi:howl-compat - Enable compat libraries for howl
net-im/sim:weather - Enable weather plugin to get weather data from weather.com and dispaly it 
net-im/sim:sms - Enable sms plugin
net-im/sim:gpg - Enable gpg plugin to adds GnuPG encryption/decryption support for messages 
net-im/sim:livejournal - Enable livejournal plugin to post in LiveJournal 
net-im/kmess:konqueror - Enable integration with konqueror
net-misc/kvpnc:cisco - Adds support for Cisco client
net-p2p/ktorrent:logviewer - Enable the logviewer plugin
net-p2p/ktorrent:search - Enable the search plugin
net-p2p/ktorrent:bwscheduler - Enable the bwscheduler plugin
net-p2p/ktorrent:stats - Enable the statistics plugin
net-p2p/ktorrent:downloadorder - Enable plugin for user selected download order
net-p2p/ktorrent:mediaplayer - Enable the mediaplayer plugin
net-p2p/ktorrent:ipfilter - Enable the ipfilter plugin
net-p2p/ktorrent:zeroconf - Discover peers on the local network using the Zeroconf protocol
net-p2p/ktorrent:webinterface - Enable the webinterface plugin
net-p2p/ktorrent:shutdown - Shutdown when done
net-p2p/ktorrent:scanfolder - Enable the scanfolder plugin
net-p2p/ktorrent:infowidget - Enable the infowidget plugin
net-p2p/ktorrent:upnp - Enable the uphp plugin
net-p2p/ktorrent:kross - Enable kross scripting support
net-voip/twinkle:ilbc - Enables use of ilbc (RFC3951) audio encoding
net-voip/twinkle:zrtp - Enables use of secure rtp using the zrtp extension of GNU RTP stack developed by Phil Zimmermann 
x11-libs/qt:immqt-bc - Enable binary compatible version of immodule for Qt
x11-libs/qt:immqt - Enable binary incompatible version of immodule for Qt
x11-themes/gtk-engines-qt:gnome - Enable proper theming of buttons in gnome toolbars (as opposed to just plain gtk+ toolbars)