app-admin/vlogger:dbi - Enable support for DBI
app-backup/darbackup:dar64 - Enables --enable-mode=64 option, which replace infinite by 64 bit integers
app-cdr/mirage2iso:pinentry - Support app-crypt/pinentry password input backend.
-app-dicts/ktranslator:festival - Enable festival support
-app-dicts/ktranslator:lowmem - Disable optimizations for searches
-app-dicts/ktranslator:ocr - Enable GOCR support
app-emulation/xenman:lvm2 - Enable lvm2 support
app-misc/2gis:data - Use maps and other data from app-misc/2gis-data
app-misc/2gis-data:astr - The map of Astrakhan for app-misc/2gis
gnome-extra/alarm-clock-applet:libnotify - Enables support for libnotify notification system
gnome-extra/evolution-rss:webkit - Build using the webkit renderer
gnome-extra/timer-applet:sounds - Installs optional sound data
-kde-misc/kcpufreq:icon - Add icon for GUI applet (enabled by default)
mail-mta/citadel:pic - Build position-independent executables
media-gfx/exact-image:agg - Adds Anti-Grain Geometry supportx11-libs/agg
media-gfx/exact-image:swig - Adds Swig support dev-lang/swig
media-video/ripwrap:mp4 - Add mp4 support
media-video/ushare:dlna - Add DLNA (media-libs/libdlna) support
net-dialup/iwar:iax2 - Enable iax2 protocol support
-net-dns/ldns-utils:sha2 - Enable SHA256 and SHA512 RRSIG support
net-dns/nsd:bind8-stats - Enables BIND8 like NSTATS and XSTATS
net-dns/nsd:dnssec - Enable DNSSEC support
net-dns/nsd:largefile - Enable largefile support
net-im/ekg2-remote:gnutls - Enable SSL/TLS support through GnuTLS. If 'ssl' is set too, GnuTLS will be used.
net-im/ekg2-remote:ssl - Enable SSL/TLS support through OpenSSL. If 'gnutls' is set too, it will be used instead.
net-im/ekg2-remote:static - Link statically with plugins instead of installing them as shared libraries (external libraries can still be linked dynamically).
-net-libs/ldns:sha2 - Enable SHA256 and SHA512 RRSIG support
net-libs/raknet:autopatcher - Enable RakNet autopatcher support
net-libs/raknet:rakvoice - Enable RakNet RakVoice module
net-mail/checkgmail:clickurl - Add support to click urls in the popup notification