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USE flags

acct-user/git

gitea

Set home directory for git hosting via www-apps/gitea.

gitolite

Set home directory for git hosting via dev-vcs/gitolite or dev-vcs/gitolite-gentoo.

acct-user/vdr

graphlcd

Prepare group membership for media-plugins/vdr-graphlcd.

legacy-homedir

Keep old home directory /var/vdr of an existing installation. When this useflag is cleared, the home directory is switched to FHS conformant /var/lib/vdr

remote

Prepare group membership for media-plugins/vdr-remote.

serial

Prepare group membership for media-plugins/vdr-serial.

app-accessibility/at-spi2-core

dbus-broker

Use DBus broker implementation instead of default DBus daemon

app-accessibility/brltty

api

build brltty's application program interface

beeper

support the console tone generator

fm

support for the sound card synthesizer

louis

Use braille translator dev-libs/liblouis

midi

support the musical instrument digital interface

pcm

support for sound card digital audio

speech

speech support

app-accessibility/emacspeak

espeak

Adds support for the espeak tts engine

app-accessibility/espeak-ng

async

Enables asynchronous commands

klatt

Enables Klatt formant synthesis and implementation

l10n_ru

Builds extended Russian Dictionary file

l10n_zh

Builds extended Chinese (Mandarin and Cantonese) Dictionary files

man

Builds and installs manpage with app-text/ronn-ng

mbrola

Adds support for mbrola voices

app-accessibility/flite

voices

Install synthetic voices

app-accessibility/freetts

jsapi

build Java Speech API (JSAPI)

mbrola

Adds support for mbrola voices

app-accessibility/orca

braille

Enable braille support

app-accessibility/speech-dispatcher

espeak

Adds support for espeak-ng speech engine

flite

Adds support for flite speech engine

app-admin/clsync

apidoc

Provide doxygen generated API docs.

cgroups

Use cgroups to limit /dev access.

clsync

Build clsync binary. Most likely you want it. However it is possible to build only libclsync without clsync itself.

cluster

Enable clustering support (allows master-master clsync on multiple hosts). Not fully implemented yet.

control-socket

Enable AF_UNIX control socket support.

extra-debug

Enable extra debugging. This will hurt performance badly. Be ready for tons of output.

extra-hardened

Enable extra security checks. This will hurt performance.

gio

Enable GIO for FS monitoring (glib based alternative to inotify interface, not recommended; if both are compiled, may be selected at runtime).

highload-locks

Allows to use spinlocks for short delays instead of mutexes, but only on SMP systems.

lto

Build with link time optimization (LTO).

namespaces

Enable namespaces isolation.

socket-library

Build the control and monitoring socket library: libclsync.

app-admin/conky

apcupsd

Enable support for sys-power/apcupsd

bundled-toluapp

Enable support for bundled toluapp. This only makes sense in combination with the lua-* flags

cmus

Enable monitoring of music played by media-sound/cmus

extras

Enable syntax highlighting for app-editors/nanoand app-editors/vim

ical

Enable support for events from iCalendar (RFC 5545) files using dev-libs/libical

intel-backlight

Enable support for Intel backlight

iostats

Enable support for per-task I/O statistics

irc

Enable support for displaying everything from an irc channel using net-libs/libircclient

lua-cairo

Enable if you want Lua Cairo bindings

lua-imlib

Enable if you want Lua Imlib2 bindings

lua-rsvg

Enable if you want Lua RSVG bindings

math

Enable support for glibc's libm math library

moc

Enable monitoring of music played by media-sound/moc

mpd

Enable monitoring of music controlled by media-sound/mpd

nvidia

Enable reading of nvidia card temperature sensors via x11-drivers/nvidia-drivers

portmon

Enable support for tcp (ip4) port monitoring

thinkpad

Enable support for IBM/Lenovo notebooks

webserver

Enable support to act as a webserver serving conkys output using net-libs/libmicrohttpd

xmms2

Enable monitoring of music played by media-sound/xmms2

app-admin/conserver

freeipmi

Compile in FreeIPMI support via sys-libs/freeipmi

app-admin/diradm

automount

Support for automount data in LDAP

irixpasswd

Support for storing separate IRIX passwords

app-admin/doas

persist

Adds support for "persist" feature (experimental)

app-admin/gkrellm

gnutls

Enable SSL support for mail checking with net-libs/gnutls (overrides 'ssl' USE flag)

lm-sensors

Enable monitoring sensors via sys-apps/lm-sensors

ntlm

Enable NTLM authentication for mail checking with net-libs/libntlm

ssl

Enable SSL support for mail checking with dev-libs/openssl

X

Build both the X11 gui (gkrellm) and the server (gkrellmd). Disabling this flag builds the server only

app-admin/gtkdiskfree

gtk2

Support GTK+ 2.x instead of GTK+ 3.x

app-admin/hddtemp

network-cron

Monthly cronjob to update hddtemp.db.

app-admin/keepass

aot

Generate native code at build time, rather than runtime.

app-admin/keepassxc

autotype

Add support to autotype the passwords into other applications

browser

Enables browser plugin support

keeshare

Enable KeeShare sharing integration

network

Enable network support

yubikey

Enable database unlocking via hardware keys supporting YubiKey-style HMAC-SHA1 protocol

app-admin/lnav

pcap

Enable support for pcap files.

app-admin/logcheck

cron

Adds file to enable hourly cron job to run logcheck"

app-admin/logrotate

acl

Installs acl support

cron

Installs cron file

selinux

Installs Security Enhanced Linux support

app-admin/logstash-bin

x-pack

Enable additional features (may need a license)

app-admin/openrc-settingsd

systemd

Use the versions of dbus and polkit files provided by sys-apps/systemd

app-admin/pass

dmenu

Add support for x11-misc/dmenu with the 'passmenu' program.

git

Use dev-vcs/git for password revisions.

importers

Allow importing passwords from other password managers using various contributed scripts.

X

Use x11-misc/xclip to copy passwords to the clipboard.

app-admin/pass-otp

qrcode

Add support for qrcodes using media-gfx/qrencode

app-admin/passwordsafe

qr

Enable QR code password display

xml

Enable XML import support

yubikey

Enable support for Yubikey

app-admin/perl-cleaner

pkgcore

Use sys-apps/pkgcore instead of sys-apps/portage and app-portage/portage-utils.

app-admin/puppet

augeas

Enable augeas support

diff

Enable diff support

hiera

Enable hiera support

rrdtool

Enable rrdtool support

shadow

Enable shadow support

app-admin/puppet-agent

puppetdb

Adds puppetdb support

app-admin/puppetserver

puppetdb

Adds support for connecting to puppetdb

app-admin/pwgen

livecd

Install init script for root password scrambling on boot

app-admin/rsyslog

clickhouse

Build the ClickHouse output module (requires net-misc/curl)

curl

Enable http_request() function in RainerScript (requires net-misc/curl)

dbi

Build the general database output module (requires dev-db/libdbi)

elasticsearch

Build the Elasticsearch output module (requires net-misc/curl)

gcrypt

Add support for encrypted log files using dev-libs/libgcrypt

gnutls

Build the GnuTLS network stream driver (requires net-libs/gnutls)

imhttp

Build the http input module (requires www-servers/civetweb)

impcap

Build the pcap input module (requires net-libs/libpcap)

kafka

Build the Apache Kafka input/output module (requires dev-libs/librdkafka)

kerberos

Build the GSSAPI input and output module (requires virtual/krb5)

kubernetes

Build the kubernetes modify plugin (requires net-misc/curl)

mdblookup

Build the MaxMind DB lookup message modify plugin using dev-libs/libmaxminddb

mongodb

Build the MongoDB output module (requires dev-libs/mongo-c-driver)

mysql

Build the MySQL database output module (requires virtual/mysql)

normalize

Build the normalize modify module (requires dev-libs/libee and dev-libs/liblognorm)

omhttp

Build the http output module (requires net-misc/curl)

omhttpfs

Build the httpfs output module (requires net-misc/curl)

omudpspoof

Build the udpspoof output module (requires net-libs/libnet)

openssl

Build the OpenSSL network stream driver (requires dev-libs/openssl)

postgres

Build the PostgreSQL database output module (requires dev-db/postgresql)

rabbitmq

Build the RabbitMQ output module (requires net-libs/rabbitmq-c)

redis

Build the Redis output module using (requires dev-libs/hiredis)

relp

Build the Reliable Event Logging Protocol (RELP) output module (requires dev-libs/librelp)

rfc3195

Build the rfc3195 input module (requires dev-libs/liblogging)

rfc5424hmac

Build the rfc5424hmac modify module (requires dev-libs/openssl)

snmp

Build the snmp modify and output module (requires net-analyzer/net-snmp)

ssl

Add support for encrypted client/server communication (requires net-libs/gnutls)

systemd

Build the journal input and output module (requires sys-apps/systemd)

usertools

Installs the user tools (rsgtutil, rscryutil...) corresponding to the set USE flags

uuid

Include UUIDs in messages (requires sys-apps/util-linux)

xxhash

Enable xxHash support in fmhash module (requires dev-libs/xxhash)

zeromq

Build the ZeroMQ input and output modules (requires net-libs/czmq)

app-admin/sagan

libdnet

Add support for dev-libs/libdnet

pcap

Add support for network packet capture via net-libs/libpcap

redis

Add support for the Redis database via dev-libs/hiredis

smtp

Build witch SMTP (E-Mail) support

app-admin/salt

cheetah

Enable support for dev-python/cheetah3

cherrypy

Enable support for using cherrypy.

genshi

Enable support for dev-python/genshi

gnupg

Enable support for gnupg via python-gnupg.

libcloud

Enable salt-cloud support via libcloud.

libvirt

Support managing virtual machines with app-emulation/libvirt.

mako

Add support for using the mako template engine for parsing salt states.

mongodb

Support returning data to a mongodb server.

neutron

Support the OpenStack neutron network service.

nova

Enable support for the OpenStack Nova API

openssl

Add support for using TLS via OpenSSL.

portage

Add support for package state enforcement using sys-apps/portage

raet

Add support for the new RAET transport.

redis

Support returning data to a redis database.

zeromq

Add support for the zeromq transport.

app-admin/setools

infoflow

Depend on dev-python/networkx to use seinfoflow

app-admin/sudo

gcrypt

Use message digest functions from dev-libs/libgcrypt instead of sudo's

offensive

Let sudo print insults when the user types the wrong password

secure-path

Replace PATH variable with compile time secure paths

sendmail

Allow sudo to send emails with sendmail

sssd

Add System Security Services Daemon support

app-admin/sysklogd

logger

Build the logger program

logrotate

use app-admin/logrotate for rotating logs rather than custom cron scripts

app-admin/syslog-ng

amqp

Enable support for AMQP destinations

geoip2

Add support for geo lookup based on IPs via dev-libs/libmaxminddb

http

Enable support for HTTP destinations

json

Enable support for JSON template formatting via dev-libs/json-c

kafka

Enable support for Kafka destinations

mongodb

Enable support for mongodb destinations

pacct

Enable support for reading Process Accounting files (EXPERIMENTAL, Linux only)

redis

Enable support for Redis destinations

smtp

Enable support for SMTP destinations

spoof-source

Enable support for spoofed source addresses

app-admin/sysstat

dcron

Adjust cronjobs to work properly under sys-process/dcron

lto

Build using Link Time Optimizations (LTO)

app-admin/testdisk

ewf

Include ewf library

ntfs

Include the ability to read NTFS filesystems

reiserfs

Include reiserfs reading ability

app-admin/tripwire

ssl

Adds support for Secure Socket Layer connections

static

Builds the package statically

tools

Installs app-admin/mktwpol, providing scripts for the installation/setup of tripwire, including generating the tripwire policy file and maintenance of the tripwire database

app-admin/ulogd

json

Build JSON output plugin to save packets in JSON file format

nfacct

Build NFACCT input plugin to support traffic accounting via nfnetlink_acct

nfct

Build NFCT input plugin to support stateful flow-based logging via nfnetlink_conntrack

nflog

Build NFLOG input plugin to support stateless packet-based logging via nfnetlink_log

pcap

Build PCAP output plugin to save packets in libpcap file format

ulog

Build ULOG input plugin to support deprecated packet-based logging via ULOG target

app-admin/vault

webui

Enable the Web UI

app-admin/webalizer

xtended

Include the 404 extension

app-admin/webapp-config

portage

Propagate python_targets dependencies to sys-apps/portage

app-alternatives/awk

busybox

Symlink to sys-apps/busybox

gawk

Symlink to sys-apps/gawk

mawk

Symlink to sys-apps/mawk (warning: mawk is not fully POSIX-compliant)

nawk

Symlink to sys-apps/nawk

app-alternatives/bc

gh

Symlink to bc-gh from sci-calculators/bc-gh

gnu

Symlink to GNU bc (sys-devel/bc)

app-alternatives/bzip2

lbzip2

Symlink to app-arch/lbzip2.

pbzip2

Symlink to app-arch/pbzip2.

reference

Symlink to app-arch/bzip2.

app-alternatives/cpio

gnu

Symlink to GNU cpio (app-arch/cpio)

libarchive

Symlink to bsdcpio from app-arch/libarchive

app-alternatives/gzip

pigz

Symlink to app-arch/pigz.

reference

Symlink to app-arch/gzip.

app-alternatives/lex

flex

Symlink to sys-devel/flex.

reflex

Symlink to sys-devel/reflex.

app-alternatives/sh

bash

Symlink to app-shells/bash

busybox

Symlink to sys-apps/busybox

dash

Symlink to app-shells/dash

ksh

Symlink to app-shells/ksh

lksh

Symlink to lksh from app-shells/mksh

mksh

Symlink to mksh from app-shells/mksh

app-alternatives/tar

gnu

Symlink to GNU tar (app-arch/tar)

libarchive

Symlink to bsdtar from app-arch/libarchive

app-alternatives/yacc

bison

Symlink to sys-devel/bison.

byacc

Symlink to dev-util/byacc.

reference

Symlink to dev-util/yacc.

app-antivirus/clamav

clamapp

Build applications (clamscan, clamd, clamdscan, clamonacc (also has its own USE flag), sigtool, clambc, clamav-milter (also requires milter USE flag), clamdtop, clamsubmit, clamconf).

clamdtop

A Top like tool which shows what clamd is currently scanning amongst other things

clamonacc

Build the clamonacc on-access scanner

clamsubmit

A tool to submit false positives / negatives

experimental

Enable experimental features

libclamav-only

Bypass building of libfreshclam and the ClamAV CLI applications.

metadata-analysis-api

Enables collection of file property metadata using ClamAV API for analysis by ClamAV bytecode programs.

rar

RAR support

system-mspack

Use dev-libs/libmspack instead of the version bundled with ClamAV

xml

DMG and XAR support

app-antivirus/clamtk

kde

Install the Dolphin plugin.

nautilus

Install the Nautilus plugin.

nemo

Install the Nemo plugin.

thunar

Install the Thunar plugin.

app-arch/cabextract

extras

Install experimental extra tools: wince_info and wince_rename for examining and processing Windows CE installation cabinet header files; cabinfo for examining the structure of a cab file.

app-arch/createrepo_c

legacy

Build with support for legacy weakdeps and hashes (not recommended!)

app-arch/dpkg

libmd

Use app-crypt/libmd library for message digest functions

update-alternatives

Install update-alternatives

app-arch/drpm

lzip

Enable app-arch/lzip decompression support via app-arch/lzlib

app-arch/dump

ermt

encrypted rmt support

uuid

Enable UUID support

app-arch/engrampa

caja

Enable engrampa to integrate with mate-base/caja by providing entries in its context menu

app-arch/file-roller

nautilus

Build contextual menu extension for gnome-base/nautilus.

app-arch/gzip

pic

disable optimized assembly code that is not PIC friendly

app-arch/innoextract

debug

Enable debug logging and the --debug command-line option

lzma

Enable support for extracting lzma-compressed installers using app-arch/xz-utils

app-arch/libarchive

blake2

Enable Blake2 hash support via app-crypt/libb2.

bzip2

Allow accessing bzip2-compressed archives through libbz2 (which comes with app-arch/bzip2). This only affects libarchive's native support: bsdtar will keep using bunzip2 as a filter if that's not built-in.

e2fsprogs

Use file flags from sys-fs/e2fsprogs headers instead of virtual/os-headers headers

nettle

Use dev-libs/nettle as crypto backend

app-arch/p7zip

natspec

Use dev-libs/libnatspec to correctly decode non-ascii file names archived in Windows.

rar

Enable support for non-free rar decoder

app-arch/rar

all-sfx

Install all SFX (Self-Extracting) files rather than just the native format (allows creation of Windows EXEs on Linux ELF systems)

app-arch/tar

minimal

just install `tar`

app-arch/unzip

natspec

Use dev-libs/libnatspec to correctly decode non-ascii file names archived in Windows.

app-arch/wimlib

fuse

Use fuse libraries

iso

Install app-cdr/cdrtools in order to prepare iso images

ntfs

Use libntfs-3g library from sys-fs/ntfs3g

yasm

Use yasm assembler instead of nasm

app-arch/xz-utils

extra-filters

Build additional filters that are not used in any of the default xz presets. This includes delta and BCJ coders, additional match finders and SHA256 checks.

app-arch/zip

natspec

Use dev-libs/libnatspec to correctly decode non-ascii file names archived in Windows.

app-backup/amanda

ndmp

Support for the NDMP protocol

s3

Support for backing up to the Amazon S3 system

xfs

Support for backing up raw XFS filesystems using xfsdump

app-backup/backup-manager

s3

Support for backing up to the Amazon S3 system

app-backup/bacula

bacula-clientonly

Disable DB support, and just build a client

bacula-nodir

Disable building of director

bacula-nosd

Disable building of storage daemon

batch-insert

Enable batch insert into data base

ipv6

Support IPV6 protocol"

logwatch

Install support files for logwatch

app-backup/bareos

ceph

Enable sys-cluster/ceph support

clientonly

Only install file-daemon (client)

director

Install director

glusterfs

Enable sys-cluster/glusterfs storage backend

jansson

JSON API support using dev-libs/jansson for director

lmdb

enable build of dev-db/lmdb support for faster accurate backup

logwatch

Install support files for sys-apps/logwatch

ndmp

Enable support for NDMP (Network Data Management Protocol)

scsi-crypto

Enable low level SCSI crypto support

storage-daemon

Install storage daemon (bareos-sd)

vmware

Enable bareos-fd VMware plugin

app-backup/btrbk

lsbtr

Enable the lsbtr command-line tool

mbuffer

Use sys-block/mbuffer to enable progress bar and buffering/limiting functionality

app-backup/dar

argon2

Enable password hashing algorithm from app-crypt/argon2

dar32

Enables --enable-mode=32 option, which replace infinite by 32 bit integers

dar64

Enables --enable-mode=64 option, which replace infinite by 64 bit integers

gcrypt

Enables strong encryption support

gpg

Enables usage of asymmetric encryption algorithms

rsync

Enables linking with net-libs/librsync for delta compression support

app-backup/duplicity

s3

Support for backing up to the Amazon S3 system

app-backup/rear

udev

Have ReaR start backup when attaching your USB drive.

app-backup/snapper

lvm

Enable LVM thinprovisioned snapshots support sys-fs/lvm2

xattr

Add support for getting and setting POSIX extended attributes, through sys-apps/attr.

app-backup/tsm

tsm-cit

IBM Tivoli Common Inventory Technology

tsm-hw

Difference snapshot support for NetApp and N-Series file servers

vmware

Install vmware data protection support

app-benchmarks/filebench

auto-completion

Enable command-line autocompletion using dev-libs/libtecla

app-benchmarks/httperf

idleconn

Build with the idleconn program

app-benchmarks/ioping

netdata

Add support for netdata

app-benchmarks/ramspeed

pic

Force shared libraries to be built as PIC (this is slower)

app-benchmarks/sysbench

aio

Add support for AIO.

attachsql

Add support for AttachSQL.

drizzle

Add support for Drizzles.

largefile

Add support for large files.

app-cdr/brasero

libburn

Enable dev-libs/libburn backend

nautilus

Build the gnome-base/nautilus extension

playlist

Enable support for playlists through dev-libs/totem-pl-parser

tracker

Enable audio playlist search using the app-misc/tracker indexer

app-cdr/cdemu

cdemu-daemon

Pull app-cdr/cdemu-daemon dependency, useful in chroot environment (bug #315491). Do not disable until you know what you are doing.

app-cdr/dvdisaster

debug

Enable memory debugging.

app-cdr/gaffitter

scripts

Install additional gaffitter scripts for external programs

app-cdr/mirage2iso

pinentry

Support app-crypt/pinentry password input backend.

app-containers/apptainer

network

Install network plug-ins

suid

Install SUID helper binary

app-containers/buildah

btrfs

Enables dependencies for the "btrfs" graph driver, including necessary kernel flags.

app-containers/containerd

btrfs

Support for BTRFS snapshot driver

cri

Support for Kubernetes CRI

device-mapper

Support for device mapper snapshot driver

app-containers/containers-storage

btrfs

Enables dependencies for the "btrfs" graph driver, including necessary kernel flags.

device-mapper

Enables dependencies for the "devicemapper" graph driver, including necessary kernel flags.

app-containers/cri-o

btrfs

Enables dependencies for the "btrfs" graph driver, including necessary kernel flags.

device-mapper

Enables dependencies for the "devicemapper" graph driver, including necessary kernel flags.

app-containers/crun

bpf

Enable in Kernel, eBPF (enhanced Berkley Packet Filter) support for managing device controllers.

criu

Enable CRIU based checkpoint/restore support

app-containers/docker

aufs

Enables dependencies for the "aufs" graph driver, including necessary kernel flags.

btrfs

Enables dependencies for the "btrfs" graph driver, including necessary kernel flags.

container-init

Makes the a staticly-linked init system tini available inside a container.

device-mapper

Enables dependencies for the "devicemapper" graph driver, including necessary kernel flags.

overlay

Enables dependencies for the "overlay" graph driver, including necessary kernel flags.

app-containers/docker-credential-helpers

pass

Build pass helper for the pass utility.

app-containers/lxc

io-uring

Enable io_uring support, and use io_uring instead of epoll

lto

Enable Link Time Optimization (LTO)

tools

Build and install additional command line tools

app-containers/podman

btrfs

Enables dependencies for the "btrfs" graph driver, including necessary kernel flags.

cgroup-hybrid

Use legacy (hybrid) cgroups instead of modern (unified) cgroups

fuse

Enables fuse dependencies (fuse-overlayfs is especially useful for rootless mode).

init

Enables catatonit dependency required for podman run --init.

rootless

Enables dependencies for running in rootless mode.

wrapper

Install wrapper which lets use podman for command `docker`

app-containers/runc

kmem

Enable Kernel Memory Accounting.

app-containers/skopeo

btrfs

Enables dependencies for the "btrfs" graph driver.

app-containers/snapd

forced-devmode

Automatically disable application confinement if feature detection fails.

app-crypt/aespipe

asm

Enable assembly modules

cpu_flags_x86_padlock

Use VIA padlock instructions, detected at run time, code still works on non-padlock processors

app-crypt/ccid

kobil-midentity

Build and install Kobil_mIDentity_switch tool

twinserial

Enable twinserial reader

app-crypt/codecrypt

cryptopp

Build algorithms that need Crypto++ support dev-libs/crypto++

app-crypt/dehydrated

cron

Install cron job to sign/renew non-existent/changed/expiring certificates

app-crypt/eid-mw

dialogs

Enable "askaccess" dialog box, by using x11-libs/gtk+

gtk

All dialogs are available, by using x11-libs/gtk+

p11-kit

Support for app-crypt/p11-kit.

app-crypt/ekeyd

minimal

Only install the ekey-egd-linux service rather than the full ekeyd package.

munin

Install a plugin for net-analyzer/munin to graph statistical data from ekeyd.

usb

Build the libusb-based userland daemon for accessing the EntropyKey (alternative to the CDC USB driver). It is suggested to use this option by default, as the CDC driver in the kernel often seems to be fragile (or the gadget implementation on the EntropyKey is too buggy), and can cause various problems.

app-crypt/gnupg

smartcard

Build scdaemon software. Enables usage of OpenPGP cards. For other type of smartcards, try app-crypt/gnupg-pkcs11-scd. Bring in dev-libs/libusb as a dependency; enable scdaemon.

tofu

Enable support for Trust on First use trust model; requires dev-db/sqlite.

tools

Install extra tools (including gpgsplit and gpg-zip).

tpm

Enable TPM support via app-crypt/tpm2-tss and build tpm2d.

usb

Build direct CCID access for scdaemon; requires dev-libs/libusb.

user-socket

try a socket directory which is not removed by init manager at session end

wks-server

Install the wks-server

app-crypt/gnupg-pkcs11-scd

proxy

Build the gnupg-pkcs11-scd-prox

app-crypt/gpgme

common-lisp

Install common-lisp files

app-crypt/hashcat

brain

Enable the hashcat brain

app-crypt/heimdal

hdb-ldap

Adds support for LDAP as a database backend

lmdb

Add support for using dev-db/lmdb for lookup tables

otp

Adds support for one-time passwords

app-crypt/ima-evm-utils

tpm

Enable TPM support

app-crypt/johntheripper-jumbo

opencl

Build with opencl/GPU cracking support

pcap

Build with pcap support

app-crypt/keybase

fuse

Enable app-crypt/kbfs support

app-crypt/kstart

afs

Enables afs support which means you can acquire an afs token and set PAGs. It's recommended to set this USE if you need authenticated access to an AFS cell for your daemon/app.

app-crypt/libb2

native-cflags

Use CFLAGS as determined by configure script. These flags will enable all CPU specific features it find available, to further optimise the implementation. This discards any existing CFLAGS set in make.conf or similar.

app-crypt/libsecret

tpm

Enable Trusted Platform Module support via app-crypt/tpm2-tss

app-crypt/libu2f-host

systemd

Use user ACLs rather than plugdev group to give user access to the HIDRAW device.

app-crypt/mit-krb5

doc

Creates and installs the API and implementation documentation. This is only useful if you want to develop software which depends on kerberos

keyutils

Enable for the keyring ccache using keyutils

lmdb

Add support for using dev-db/lmdb for lookup tables

openldap

Enable support for ldap as a database backend

pkinit

Enable pkinit support for the initial ticket

app-crypt/mkp224o

pcre

Search with a regex instead of prefix/suffix matching

app-crypt/ophcrack

tables

Require the additional tables used to carry out cracking (app-crypt/ophcrack-tables)

app-crypt/ophcrack-tables

vistafree

Installs the free Vista ophcrack tables

xpfast

Installs the fast XP ophcrack tables

xpsmall

Installs the small free XP ophcrack tables

app-crypt/p11-kit

asn1

Enable ASN.1 certificate support

trust

Build the trust policy module

app-crypt/pinentry

efl

Build dev-libs/efl based pinentry

app-crypt/qca

botan

Enable botan plugin

gcrypt

Enable gcrypt plugin

gpg

Enable GnuPG plugin

logger

Enable logger plugin

nss

Enable NSS plugin

pkcs11

Enable PKCS#11 plugin

sasl

Enable SASL plugin

softstore

Enable softstore plugin

app-crypt/seahorse

ldap

Enable seahorse to manipulate GPG keys on a LDAP server.

app-crypt/swtpm

fuse

Support sys-fs/fuse based /dev/tpm interface

gnutls

Build the swtpm_cert binary which depends on net-libs/gnutls

openssl

Use dev-libs/openssl as crypto engine

app-crypt/tpm2-pkcs11

fapi

Enable feature API backend

app-crypt/tpm2-tools

fapi

Enable feature API tools

app-crypt/tpm2-totp

plymouth

Add sys-boot/plymouth support

app-crypt/tpm2-tss

fapi

Enable feature API (requires openssl as crypto backend)

mbedtls

Use net-libs/mbedtls as crypto engine

openssl

Use dev-libs/openssl as crypto engine

policy

Enable policy library (requires openssl as crypto backend)

app-crypt/tpm-emulator

mtm-emulator

Build the MTM emulator

app-crypt/tpm-tools

pkcs11

Build Token data management utilities based on OpenCryptoki's (dev-libs/opencryptoki) PKCS#11 implementation.

app-crypt/veracrypt

asm

Enable assembly for optimization

app-crypt/zulucrypt

kwallet

Enable encrypted storage of passwords with kde-frameworks/kwallet

udev

Whether udev will be consulted when deciding if a volume is system or not

app-dicts/aspell-be

classic

Support classic spelling by default

app-dicts/gwaei

hunspell

Enable app-text/hunspell spellchecking and morphological analysis

mecab

Enable app-text/mecab support

app-dicts/myspell-pt

preao

Use the pre ortographic agreement version of the dictionary

app-doc/csound-manual

html

Install HTML documentation

app-doc/devmanual

offline

Use alternative minimal stylesheet instead of Tyrian theme

app-doc/doxygen

clang

support for sys-devel/clang assisted parsing

dot

allow to create dot graphs using media-gfx/graphviz

doxysearch

build doxyindexer and doxysearch.cgi

app-doc/kicad-doc

html

Generate documentation in HTML format

pdf

Generate documentation in PDF format

app-doc/linuxfromscratch

htmlsingle

Install all-on-one-page HTML version.

app-doc/pms

html

Generate and install PMS as .html as well

twoside

Enable two-sided layout suitable for printing

app-doc/pms-bin

html

Install PMS as .html as well

app-doc/tldp-howto

html

Install multi-chapter HTML docs

htmlsingle

Install all-on-one-page HTML docs

pdf

Install pdf docs

text

Install plain-text docs

app-editors/bluefish

gucharmap

Enable gucharmap dictionary plugin

spell

Enable spell checking capabilities via enchant library

app-editors/emacs

athena

Enable the MIT Athena widget set (x11-libs/libXaw)

dynamic-loading

Enable loading of dynamic libraries (modules) at runtime

games

Support shared score files for games

gfile

Use gfile (dev-libs/glib) for file notification

gmp

Use the GNU multiple precision arithmetic library (dev-libs/gmp) instead of the bundled mini-gmp subset

gsettings

Use gsettings (dev-libs/glib) to read the system font name

gzip-el

Compress bundled Emacs Lisp source

harfbuzz

Use media-libs/harfbuzz as text shaping engine

imagemagick

Use media-gfx/imagemagick for image processing

jit

Compile with Emacs Lisp native compiler support via libgccjit

json

Compile with native JSON support using dev-libs/jansson

libxml2

Use dev-libs/libxml2 to parse XML instead of the internal Lisp implementations

mailutils

Retrieve e-mail using net-mail/mailutils instead of the internal movemail substitute

small-ja-dic

Generate a smaller-size Japanese dictionary (saves about 5 MiB in installed image)

source

Install C source files and make them available for find-function

threads

Add elisp threading support

toolkit-scroll-bars

Use the selected toolkit's scrollbars in preference to Emacs' own scrollbars

tree-sitter

Support the dev-libs/tree-sitter parsing library

wide-int

Prefer wide Emacs integers (typically 62-bit). This option has an effect only on architectures where "long" and "long long" types have different size.

xwidgets

Enable use of GTK widgets in Emacs buffers (requires GTK3)

app-editors/fe

sendmail

Send mail after editor abend

app-editors/featherpad

X

Link application against X11 libraries which adds support for virtual desktop awareness and tab DND

app-editors/gedit-plugins

charmap

Insert special characters just by clicking on them

git

Shows document changes related to git's HEAD

terminal

Embed a terminal in the bottom pane

app-editors/gnome-latex

latexmk

Install dev-tex/latexmk (used by default for the build tools)

rubber

Install dev-tex/rubber (can be used for the build tools)

app-editors/gvim

crypt

Use dev-libs/libsodium for crypto support

cscope

Enable cscope interface

netbeans

Include netbeans external editor integration support

racket

Enable support for Scheme using dev-scheme/racket

app-editors/helix

grammar

Build and install grammar language files

app-editors/jasspa-microemacs

nanoemacs

Build NanoEmacs instead of MicroEmacs

app-editors/joe

xterm

Enable full xterm clipboard support

app-editors/leafpad

emacs

Enable Emacs key theme

app-editors/mousepad

shortcuts

Build the "shortcuts" plugin

app-editors/nano

debug

Enable debug messages and assert warnings. Note that these will all be sent straight to stderr rather than some logging facility.

justify

Enable justify/unjustify functions for text formatting.

magic

Add magic file support (sys-apps/file) to automatically detect appropriate syntax highlighting

minimal

Disable all fancy features, including ones that otherwise have a dedicated USE flag (such as spelling).

app-editors/neovim

lto

Build with Link Time Optimization (LTO)

nvimpager

Install nvimpager symlink to less.sh macro

tui

Build the neovim unix tui

app-editors/okteta

designer

Build plugins for dev-qt/designer

app-editors/pluma-plugins

bracketcompletion

Auto complete bracket pairs

codecomment

Comment code blocks

smartspaces

Insert smart spaces

synctex

Enable synctex support for pdflatex

terminal

Embed a terminal in the bottom pane

app-editors/qhexedit2

gui

Install Qt5 hex editor

app-editors/tea

aspell

Enable spellchecking using app-text/aspell

hunspell

Enable spellchecking using app-text/hunspell

qml

Enable support for plugins using QML

app-editors/vim

crypt

Use dev-libs/libsodium for crypto support

cscope

Enable cscope interface

racket

Enable support for Scheme using dev-scheme/racket

terminal

Enable terminal emulation support

vim-pager

Install vimpager and vimmanpager links

X

Link console vim against X11 libraries to enable title and clipboard features in xterm

app-editors/vis

tre

more memory efficient regex search using dev-libs/tre

app-editors/xemacs

athena

Chooses the MIT Athena widget set

bignum

Support for OpenSSL bignum implementation

dnd

Enables support for the x11-libs/dnd drag-n-drop library

eolconv

Support detection and translation of newline conventions

mule

Add multi-language support to XEmacs

pop

Support POP for mail retrieval

xim

Enable X11 XiM input method

app-emacs/auctex

preview-latex

Use bundled preview-latex

app-emacs/bbdb

tex

Install plain TeX support files

vm

Add support for app-emacs/vm

wanderlust

Add support for app-emacs/wanderlust

app-emacs/calfw

howm

Add support for the app-emacs/howm note-taking tool

app-emacs/elscreen

wanderlust

Include support for app-emacs/wanderlust

app-emacs/emacs-common

games

Support shared score files for games

gsettings

Install schema file for gsettings (dev-libs/glib)

app-emacs/emacs-w3m

gzip-el

Compress bundled Emacs Lisp source

app-emacs/magit

libgit

Use libgit (app-emacs/libegit2)

app-emacs/mu-cite

bbdb

Include support for app-emacs/bbdb

app-emacs/org-mode

contrib

Install user-contributed files

odt-schema

Install non-free schema files for OpenDocument Text exporter

app-emacs/remember

bbdb

Include support for app-emacs/bbdb

planner

Include support for app-emacs/planner

app-emacs/slime

xref

Install xref.lisp cross-referencing tool

app-emacs/sly

xref

Install xref.lisp cross-referencing tool

app-emacs/vm

bbdb

Include support for app-emacs/bbdb

app-emacs/wanderlust

bbdb

Include support for app-emacs/bbdb

app-emacs/wikipedia-mode

outline-magic

Enable support for outline-mode extensions (app-emacs/outline-magic)

app-emulation/86Box

dinput

Enable legacy Dinput mode instead of Xinput for older controllers.

experimental

Enable hardware from devbranch, which may be unstable or unusable.

fluidsynth

Enable MIDI support through media-sound/fluidsynth.

munt

Enable MIDI MT-32 support through media-libs/munt-mt32emu.

new-dynarec

Enable new dynamic recompiler from PCem 15, which should provide an even better emulation speed.

app-emulation/aranym

clipboard

Enable bidirectional clipboard transfer between the host and FreeMiNT

jit

Build Just-In-Time compiler variant with increased performance

lilo

Enable support for directly booting kernels such as Linux

osmesa

Allow images to be rendered in memory using the host CPU

pmmu

Build full PMMU variant, required for running mainline Linux

standard

Build standard (no JIT or PMMU) variant

app-emulation/bochs

3dnow

Enable support for emulating 3DNow! instructions (incomplete)

avx

Enable support for emulating Advanced Vector Extensions (AVX)

debugger

Enable debugger (slows down emulation)

gdb

Enable support for the remote GDB stub

x86-64

Enable support for emulation of 64-bit CPUs

app-emulation/crossover-bin

capi

Enable ISDN support via CAPI

opencl

Enable OpenCL support

osmesa

Add support for OpenGL in bitmaps using libOSMesa

pcap

Support packet capture software (e.g. wireshark)

app-emulation/dosemu

fluidsynth

use media-sound/fluidsynth for MIDI emulation

app-emulation/dxvk

crossdev-mingw

Use sys-devel/crossdev for the toolchain rather than dev-util/mingw64-toolchain (requires manual setting up)

d3d10

Enable support for DirectX 10 (d3d10.dll)

d3d11

Enable support for DirectX 11 (d3d11.dll)

d3d9

Enable support for DirectX 9 (d3d9.dll)

dxgi

Enable support for the DirectX Graphics Infrastructure (dxgi.dll)

app-emulation/faudio

dumpvoices

FAudio dumps buffer data to individual files with RIFF/XWMA headers, usable with players like ffplay/testxwma.

app-emulation/fs-uae

fmv

Enable support for CD32 FMV (full motion video)

glew

Enable support for The OpenGL Extension Wrangler Library (media-libs/glew)

app-emulation/fs-uae-launcher

lha

Enable LHA archive support

app-emulation/fuse

backend-fbcon

Use framebuffer rendering backend

backend-gtk3

Use Gtk+ rendering backend

backend-sdl

Use SDL rendering backend

backend-svga

Use svgalib rendering backend

backend-X

Use X11 rendering backend

memlimit

Add compile-time memory usage limiting

app-emulation/fuse-utils

gcrypt

Use dev-libs/libgcrypt for low-level crypto of some features, including logfiles.

app-emulation/grub-xen-host

pvh

Build an additional grub bin for pvh.

app-emulation/hyperd

libvirt

Enable support for KVM via libvirt

xen

Enable support for the Xen Hypervisor

app-emulation/libcacard

passthrough

Enable smartcard passthrough support via sys-apps/pcsc-lite

app-emulation/libguestfs

erlang

Build Erlang bindings

fuse

Enable image mount support via sys-fs/fuse

inspect-icons

Use media-gfx/icoutils for accessing/inspecting icon file within images

libvirt

Use app-emulation/libvirt to manipulate VMs

systemtap

Use dev-util/systemtap to inspect VM via "probes"

app-emulation/libspectrum

gcrypt

Use dev-libs/libgcrypt for low-level crypto of some features, including logfiles.

app-emulation/libvirt

dtrace

Enable dtrace support via dev-util/systemtap

firewalld

DBus interface to iptables/ebtables allowing for better runtime management of your firewall.

fuse

Allow LXC to use sys-fs/fuse for mountpoints

glusterfs

Enable GlusterFS support via sys-cluster/glusterfs

iscsi

Allow using an iSCSI remote storage server as pool for disk image storage

iscsi-direct

Allow using libiscsi for iSCSI storage pool backend

libssh

Use net-libs/libssh to communicate with remote libvirtd hosts, for example: qemu+libssh://server/system

libssh2

Use net-libs/libssh2 to communicate with remote libvirtd hosts, for example: qemu+libssh2://server/system

libvirtd

Builds the libvirtd daemon as well as the client utilities instead of just the client utilities

lvm

Allow using the Logical Volume Manager (sys-fs/lvm2) as pool for disk image storage

lxc

Support management of Linux Containers virtualisation (app-containers/lxc)

nfs

Allow using Network File System mounts as pool for disk image storage

numa

Use NUMA for memory segmenting via sys-process/numactl and sys-process/numad

openvz

Support management of OpenVZ virtualisation (openvz-sources)

parted

Allow using real disk partitions as pool for disk image storage, using sys-block/parted to create, resize and delete them.

pcap

Support auto learning IP addreses for routing

qemu

Support management of QEMU virtualisation (app-emulation/qemu)

rbd

Enable rados block device support via sys-cluster/ceph

virt-network

Enable virtual networking (NAT) support for guests. Includes all the dependencies for NATed network mode. Effectively any network setup that relies on libvirt to setup and configure network interfaces on your host. This can include bridged and routed networks ONLY if you are allowing libvirt to create and manage the underlying devices for you. In some cases this requires enabling the 'netcf' USE flag (currently unavailable).

virtualbox

Support management of VirtualBox virtualisation (app-emulation/virtualbox)

wireshark-plugins

Build the net-analyzer/wireshark plugin for the Libvirt RPC protocol

xen

Support management of Xen virtualisation (app-emulation/xen)

zfs

Enable ZFS backend storage sys-fs/zfs

app-emulation/nemu

network-map

Adds possibility of exporting network map to SVG

ovf

Adds support for OVA/OVF import

remote-api

Adds API for remote control

spice

Adds Spice protocol support

vnc-client

Adds support for external VNC client

app-emulation/open-vm-tools

deploypkg

Build deploypkg plugin

dnet

Enable support for nicinfo

doc

Generate API documentation

fuse

Enable vmblock-fuse/vmhgfs-fuse

gtkmm

Compile with Gtkmm and sigc++ (Recommended)

multimon

Enable multimon (Requires X)

resolutionkms

Build the linux/unix resolutionkms module

vgauth

Build vgauth

app-emulation/pcem

networking

Enable support for emulation of network cards.

app-emulation/punes

cg

Add support for Nvidia CG Toolkit

app-emulation/q4wine

ico

Enable ico support via media-gfx/icoutils

iso

Support unprivileged mounting of ISO9660 images via sys-fs/fuseiso

wineappdb

Enable Wine AppDB browser support

app-emulation/qemu

accessibility

Adds support for braille displays using brltty

aio

Enables support for Linux's Async IO

alsa

Enable alsa output for sound emulation

bpf

Enable eBPF support for RSS implementation.

capstone

Enable disassembly support with dev-libs/capstone

curl

Support ISOs / -cdrom directives via HTTP or HTTPS.

fdt

Enables firmware device tree support

fuse

Enables FUSE block device export

glusterfs

Enables GlusterFS cluster fileystem via sys-cluster/glusterfs

gnutls

Enable TLS support for the VNC console server. For 1.4 and newer this also enables WebSocket support. For 2.0 through 2.3 also enables disk quorum support.

io-uring

Enable efficient I/O via sys-libs/liburing.

iscsi

Enable direct iSCSI support via net-libs/libiscsi instead of indirectly via the Linux block layer that sys-block/open-iscsi does.

jemalloc

Enable jemalloc allocator support

jpeg

Enable jpeg image support for the VNC console server

multipath

Enable multipath persistent reservation passthrough via sys-fs/multipath-tools.

ncurses

Enable the ncurses-based console

nfs

Enable NFS support

numa

Enable NUMA support

pin-upstream-blobs

Pin the versions of BIOS firmware to the version included in the upstream release. This is needed to sanely support migration/suspend/resume/snapshotting/etc... of instances. When the blobs are different, random corruption/bugs/crashes/etc... may be observed.

pipewire

Enable pipewire output for sound emulation

plugins

Enable qemu plugin API via shared library loading.

png

Enable png image support for the VNC console server

pulseaudio

Enable pulseaudio output for sound emulation

rbd

Enable rados block device backend support, see https://docs.ceph.com/en/mimic/rbd/qemu-rbd/

sdl

Enable the SDL-based console

sdl-image

SDL Image support for icons

slirp

Enable TCP/IP in hypervisor via net-libs/libslirp

spice

Enable Spice protocol support via app-emulation/spice

ssh

Enable SSH based block device support via net-libs/libssh2

static

Build the User and Software MMU (system) targets as well as tools as static binaries

static-user

Build the User targets as static binaries

systemtap

Enable SystemTAP/DTrace tracing

usb

Enable USB passthrough via dev-libs/libusb

usbredir

Use sys-apps/usbredir to redirect USB devices to another machine over TCP

vde

Enable VDE-based networking

vhost-net

Enable accelerated networking using vhost-net, see https://www.linux-kvm.org/page/VhostNet

virgl

Enable experimental Virgil 3d (virtual software GPU)

virtfs

Enable VirtFS via virtio-9p-pci / fsdev. See https://wiki.qemu.org/Documentation/9psetup

vte

Enable terminal support (x11-libs/vte) in the GTK+ interface

xattr

Add support for getting and setting POSIX extended attributes, through sys-apps/attr. Requisite for the virtfs backend.

xen

Enables support for Xen backends

app-emulation/runv

libvirt

Enable support for KVM via libvirt

xen

Enable support for the Xen Hypervisor

app-emulation/ski

debug

enable extra binary emulation debugging via sys-libs/binutils-libs

app-emulation/spice

smartcard

Enable smartcard remoting using app-emulation/libcacard

app-emulation/uade

fuse

Enable sys-fs/fuse uadefs frontend for on-the-fly WAV conversion

app-emulation/vice

ethernet

Enable ethernet emulation

headless

Include the headless variant of the emulator

mpg123

Enable mp3@64 cartridge support

parport

Enable parallel port SID support

pci

Enable PCI device discovery using sys-apps/pciutils

app-emulation/virt-manager

policykit

Enables sys-auth/polkit authentication support, required when using app-emulation/libvirt with PolicyKit authentication

sasl

Depend on the proper libraries needed to connect to SASL-enabled libvirtd instances (e.g. Kerberos-protected instances).

app-emulation/virtualbox

dtrace

Install dtrace Extension Pack

headless

Build without any graphic frontend

lvm

Build VBoxVolInfo that needs devicemapper from sys-fs/lvm2.

pax-kernel

Apply patch needed for pax enabled kernels.

sdk

Enable building of SDK

udev

Controls installation of special USB udev rules.

vboxwebsrv

Build and install the VirtualBox webservice

vde

Support for VDE networking via net-misc/vde

app-emulation/virt-viewer

libvirt

Support connecting to virtual machines managed by libvirt.

spice

Support connecting to SPICE-enabled virtual machines.

vnc

Support connecting to VNC-enabled virtual machines.

vte

Enable terminal support (x11-libs/vte) in the GTK+ interface

app-emulation/virt-what

dmi

Use sys-apps/dmidecode to read firmware data

app-emulation/vkd3d

spirv-tools

Enable SPIRV shader debugging support using dev-util/spirv-tools

app-emulation/vkd3d-proton

crossdev-mingw

Use sys-devel/crossdev for the toolchain rather than dev-util/mingw64-toolchain (requires manual setting up)

extras

Install extra tools and demos in /usr/lib/vkd3d-proton

app-emulation/wine-gecko

shared

Install pre-unpacked files which do not need to be copied into the Wine prefix

app-emulation/wine-mono

shared

Install pre-unpacked files which do not need to be copied into the Wine prefix

app-emulation/wine-proton

crossdev-mingw

Use sys-devel/crossdev for the toolchain rather than dev-util/mingw64-toolchain (requires manual setting up)

gecko

Enable mshtml support using app-emulation/wine-gecko

mono

Enable .NET support using app-emulation/wine-mono

osmesa

Enable off-screen rendering (OpenGL in bitmaps) support

perl

Install helpers that require perl (winedump/winemaker)

sdl

Enable gamepad support using media-libs/libsdl2

vkd3d

Enable DirectX 12 support using app-emulation/vkd3d

app-emulation/wine-staging

capi

Enable ISDN support using net-libs/libcapi

crossdev-mingw

Use sys-devel/crossdev for the toolchain rather than dev-util/mingw64-toolchain (requires manual setting up)

dos

Pull in games-emulation/dosbox to run DOS applications

gecko

Enable mshtml support using app-emulation/wine-gecko

mingw

Build PE files using a MinGW toolchain for better compatibility

mono

Enable .NET support using app-emulation/wine-mono

netapi

Enable support for configuring remote shares using net-fs/samba

opencl

Enable OpenCL support

osmesa

Enable off-screen rendering (OpenGL in bitmaps) support

pcap

Support packet capture software (e.g. wireshark)

perl

Install helpers that require perl (winedump/winemaker)

samba

Pull in net-fs/samba with winbind for NTLM auth support

sdl

Enable gamepad support using media-libs/libsdl2

wow64

Enable running 32bit applications without 32bit ELF multilib by mapping to 64bit calls (experimental/WIP, USE=abi_x86_32 is recommended for complete support)

app-emulation/winetricks

rar

Pull in app-arch/unrar for extraction of rar-compressed game files

app-emulation/wine-vanilla

capi

Enable ISDN support using net-libs/libcapi

crossdev-mingw

Use sys-devel/crossdev for the toolchain rather than dev-util/mingw64-toolchain (requires manual setting up)

dos

Pull in games-emulation/dosbox to run DOS applications

gecko

Enable mshtml support using app-emulation/wine-gecko

mingw

Build PE files using a MinGW toolchain for better compatibility

mono

Enable .NET support using app-emulation/wine-mono

netapi

Enable support for configuring remote shares using net-fs/samba

opencl

Enable OpenCL support

osmesa

Enable off-screen rendering (OpenGL in bitmaps) support

pcap

Support packet capture software (e.g. wireshark)

perl

Install helpers that require perl (winedump/winemaker)

samba

Pull in net-fs/samba with winbind for NTLM auth support

sdl

Enable gamepad support using media-libs/libsdl2

vkd3d

Enable DirectX 12 support using app-emulation/vkd3d

wow64

Enable running 32bit applications without 32bit ELF multilib by mapping to 64bit calls (experimental/WIP, USE=abi_x86_32 is recommended for complete support)

app-emulation/x48

readline

Enables support for libreadline

app-emulation/xe-guest-utilities

xenstore

Use xenstore binaries bundled by Citrix instead of building app-emulation/xen-tools

app-emulation/xen

boot-symlinks

Symlink xen.gz variants in /boot, disable on fat filesystems

efi

Adds efi boot support, requires LDFLAG -melf_x86_64 for amd64

flask

Enable the Flask XSM module from NSA

app-emulation/xen-tools

api

Build the C libxenapi bindings

hvm

Enable support for hardware based virtualization (VT-x,AMD-v)

ipxe

Enable ipxe support

ovmf

Enable support to boot UEFI guest vm, needed by hvm

pygrub

Install the pygrub boot loader

qemu

Enable IOEMU support via the use of qemu-dm

qemu-traditional

Build the old qemu traditional device model (useful only if you cannot change to the new device model e.g. Windows VMs)

rombios

Enable rombios support, needed by ipxe

screen

Enable support for running domain U console in an app-misc/screen session

system-ipxe

Using sys-firmware/ipxe instead of the bundled one

system-qemu

Using app-emulation/qemu instead of the bundled one

system-seabios

Using sys-firmware/seabios instead of the bundled one

app-emulation/xtrs

ls-dos

Install LS-DOS disk images for Model 4P

app-eselect/eselect-php

fpm

Enable the FastCGI Process Manager SAPI

app-eselect/eselect-wine

xdg

Set XDG_DATA_DIRS to use the selected wine.desktop, allows e.g. 'xdg-open my.exe' for file managers

app-forensics/afflib

fuse

Enable extra fuse thingies

qemu

Enable qemu stuff

s3

Enable support for Amazon S3

app-forensics/aide

curl

Use curl for http,https and ftp backends

e2fs

Enable support for checking file attributes on ext2/ext3/ext4 filesystems

app-forensics/chkrootkit

cron

Install cron script for weekly rootkit scans

app-forensics/honggfuzz

clang

Enable clang support (pull sys-libs/blocksruntime dependency).

app-forensics/libewf

bfio

Enables libbfio for chaining file in file handling

fuse

Enable fuse support for ewfmount

uuid

Enable UUID support in the ewftools

app-forensics/lynis

cron

Install /etc/cron.* files

app-forensics/sleuthkit

aff

Enable extra aff formats

ewf

Enable libewf support

app-forensics/volatility3

crypt

support plugins that decrypt passwords, password hashes, etc.

disasm

support plugins that perform malware analysis and disassemble code

jsonschema

improve error messages regarding improperly configured ISF files

leechcore

support memory acquisition via leechcore

snappy

support AVMLs native compression format

yara

support YARA pattern matching engine

app-forensics/yara

cuckoo

Enable cockoo module

dex

Enable dex module

dotnet

Enable dotnet module

macho

Enable macho module

magic

Enable magic module

profiling

Enable rules profiling

python

Pulls in python binding via dev-python/yara-python

app-i18n/fcitx

autostart

Enable XDG-compatible autostart of Fcitx

enchant

Enable Enchant backend (using app-text/enchant) for spelling hinting

gtk2

Install input method module for GTK+ 2

gtk3

Install input method module for GTK+ 3

opencc

Enable OpenCC engine (using app-i18n/opencc) for converter between Simplified Chinese and Traditional Chinese

pango

Enable support for x11-libs/pango

table

Install table input methods for Simplified Chinese

xkb

Enable support for XKB (required for fcitx-xkb, fcitx-xkbdbus, part of fcitx-keyboard)

app-i18n/fcitx-libpinyin

dictionary-manager

Install dictionary manager

app-i18n/fcitx-rime

configuration_tool

Install configuration tool

app-i18n/fcitx-unikey

macro-editor

Install macro editor

app-i18n/freewnn

uum

Build uum

app-i18n/ibus

emoji

Enable support for Emoji

gtk2

Enable the GTK-2 input method module

gtk3

Enable the GTK-3 input method module

gtk4

Enable the GTK-4 input method module

unicode

Enable support for Unicode choice

app-i18n/ibus-handwrite

zinnia

Enable support for app-i18n/zinnia

app-i18n/ibus-libpinyin

boost

Compile against dev-libs/boost libraries

opencc

Enable support for app-i18n/opencc

app-i18n/ibus-pinyin

boost

Enable support for dev-libs/boost

app-i18n/im-chooser

xfce

Enable support for XFCE panel

app-i18n/imsettings

xfconf

Enable support for xfce-base/xfconf

app-i18n/librime

debug

Enable debugging (including logging of input of RIME input methods)

app-i18n/mozc

fcitx4

Enable support for app-i18n/fcitx 4

gui

Install graphical user interface tool (mozc_tool)

ibus

Enable support for app-i18n/ibus

renderer

Enable native candidate window

app-i18n/pyzy

boost

Enable support for dev-libs/boost

doc

Generate API documentation

opencc

Enable support for app-i18n/opencc

app-i18n/rime-data

extra

Install extra packages

app-i18n/scim

gtk3

Enable support for x11-libs/gtk+:3

app-i18n/scim-anthy

gtk3

Enable support for x11-libs/gtk+:3

kasumi

Use Anthy dictionary maintenance tool (app-dicts/kasumi)

app-i18n/tomoe

hyperestraier

Enable support for app-text/hyperestraier

app-i18n/uim

anthy

Enable support for app-i18n/anthy

eb

Enable support for dev-libs/eb

gtk2

Enable support for x11-libs/gtk+:2

skk

Enable support for app-i18n/skk-jisyo

app-laptop/hdapsd

libconfig

Require dev-libs/libconfig to allow the daemon to read a configuration file at startup

app-laptop/ibam

gkrellm

Enable building of app-admin/gkrellm module

app-laptop/laptop-mode-tools

apm

Add APM (Advanced Power Management) support

app-laptop/pbbuttonsd

ibam

Enable support for Intelligent Battery Monitoring

macbook

Enable support for the Macbook and Macbook Pro

app-laptop/thinkfan

atasmart

include libatasmart support to get disc temperature

nvidia

allow thinkfan to read GPU temperature from the proprietary nVidia driver

yaml

use YAML format for config file

app-laptop/tp_smapi

hdaps

Install a compatible HDAPS module

app-metrics/collectd

contrib

Install user-contributed files in the doc directory

filecaps

When set collectd daemon will have set required capabilities to run most plugins even if run as unprivileged user

java

Must be set (workaround for java-pkg-opt-2 eclass limitation) when you want java or genericjmx plugin

udev

Enable optional udev usage in disk plugin; Required for smart plugin

xfs

Enable optional capability to filter on XFS file system in df plugin; Requires XFS headers from sys-fs/xfsprogs

app-misc/blink1

mini-tool

Build and install command-line mini-tool blink1-mini-tool (normally used for embedded devices)

server

Build and install REST API server (currently hard-coded to TCP port 8080)

tool

Build and install command-line tool blink1-tool

app-misc/broot

X

X11 clipboard interaction

app-misc/byobu

screen

Use app-misc/screen as the default backend

app-misc/ca-certificates

cacert

Include root/class3 certs from CAcert (https://www.cacert.org/)

app-misc/carbon-c-relay

lz4

add support for LZ4 compressed transport

oniguruma

use dev-libs/oniguruma as regex implementation

pcre2

use dev-libs/libpcre2 as regex implementation

snappy

add support for Snappy compressed transport

app-misc/ddccontrol

pci

enable direct PCI memory access (the setuid ddcpci util)

app-misc/ddcutil

drm

Use x11-libs/libdrm for more verbose diagnostics.

usb-monitor

Adds support for monitors attached via USB.

user-permissions

Adds a udev rules to allow non-root users in the i2c group to access the /dev/i2c-* devices. If usb-monitor is selected, users will need to be added to the video group to access the USB monitor. Otherwise, only root will be able to use ddcutil.

app-misc/digitemp

ds2490

Build support for the ds2490 sensor

ds9097

Build support for the ds9097 sensor

ds9097u

Build support for the ds9097u sensor

app-misc/fastfetch

chafa

Enables text/graphics renderer with media-gfx/chafa

ddcutil

Use app-misc/ddcutil to query monitor settings

opencl

Enables OpenCL support

osmesa

Enables offscreen rendering support from media-libs/mesa

pci

Enables reading GPU via sys-apps/pciutils

vulkan

Enables reading GPU via media-libs/vulkan-loader

xfce

Enables support for XFCE config

xrandr

Enables support for Xrandr

app-misc/FreeSSM

small-resolution

Build the app for small resolution screeens

app-misc/g810-led

hidapi

Use dev-libs/hidapi instead of virtual/libusb for talking to the device (advertised to be faster)

app-misc/geoclue

modemmanager

Enable geolocation through 3G or GPS enabled hardware through net-misc/modemmanager.

zeroconf

Enable retrieval of GPS location from Android devices with https://wiki.gnome.org/Apps/GeoclueShare

app-misc/gramps

berkdb

Support BerkeleyDB-based family trees produced by older versions of Gramps

geo

Enable rendering of geographical data using sci-geosciences/osm-gps-map

rcs

Adds support for family tree archives via dev-vcs/rcs

reports

All external software that is needed for graphical reports will be installed

app-misc/graphlcd-base

fontconfig

Add support for media-libs/fontconfig font names.

freetype

Add support for media-libs/freetype.

graphicsmagick

Add support for media-gfx/graphicsmagick.

imagemagick

Add support for media-gfx/imagemagick.

app-misc/irtrans-irserver

mono

Enable mono support

app-misc/jdupes

dedupe

Enable deduplication support

lowmem

Enable support for low-memory operation

app-misc/jp

jpp

Install jpp which is an extended superset of the jp CLI for JMESPath

app-misc/jpipe

jpp-symlink

Install a jpp symlink that points to jpipe.

jp-symlink

Install a jp symlink that points to jpipe.

app-misc/jq

oniguruma

Use dev-libs/oniguruma for regular expression support

app-misc/kryoflux-dtc

demos

Install example floppy game files.

fast-firmware

Install fast firmware instead of slow firmware.

app-misc/lcd4linux

apm

Enable the APM plugin.

asterisk

Enable the Asterisk plugin.

button-exec

Enable the Button plugin, to execute something on keypress.

cpuinfo

Enable the cpuinfo plugin.

dbus

Enable the dbus plugin.

diskstats

Enable the diskstats plugin.

dmalloc

Enable dmalloc for debugging.

dvb

Enable support for the DVB plugin.

event

Enable the event plugin.

exec

Enable the exec plugin, to read output from external programs.

fifo

Enable the FIFO (First-In, First-Out) plugin.

file

Enable the file plugin, to read from input from files.

gps

Enable the gps plugin, for reading gps coordinates.

hddtemp

Enable the hddtemp plugin, to read from the hddtemp daemon.

huawei

Enable the huawei plugin, to read from a huawei device.

i2c-sensors

Enable the i2c_sensors plugin, to read sensor data.

iconv

Enable the iconv plugin, to convert between encodings.

isdn

Enable the isdn plugin, to get information about ISDN.

kvv

Enable the kvv plugin, to get realtime train schedule from the Karlsruher Verkehrsverbund.

loadavg

Enable the loadavg plugin, to get stats load

meminfo

Enable the meminfo plugin, to get memory statistics.

mpd

Enable the mpd plugin, to read from the Music Player Daemon.

mpris-dbus

Enable the mpris plugin, to read data via dbus for mpris.

mysql

Enable the mysql plugin, to get mysql database information.

netdev

Enable the netdev plugin, to get interface statistics.

netinfo

Enable the netinfo plugin, to get more interface statistic.

outb

Enable raw i/o access.

pop3

Enable the pop3 plugin, to get notified about new mails.

proc-stat

Enable the proc_stat plugin, to read data from the proc file system.

python

Enable support for dev-lang/python and enable the python plugin, to execute own python scripts.

qnaplog

Enable the qnaplog plugin, to read a log from a QNAP device.

raspi

Enable the raspi plugin, to read sensor data from a Raspberry Pi.

sample

Enable the sample plugin.

statfs

Enable the statfs plugin, to get statistics about the file system.

uname

Enable the uname plugin, to get the output of uname.

uptime

Enable the uptime plugin.

w1retap

Enable the w1retap plugin.

wireless

Enable the wireless plugin, to get wireless statistics.

app-misc/lcdproc

ethlcd

Enable support for ethlcd in the hd44780 driver.

extra-charmaps

Enable extra language specific charmaps.

menu

Enable menu support in the lcdproc client.

nfs

Display NFS filesystem stats in the lcdproc client.

png

Enable support for media-libs/libpng in the glcd driver.

samba

Display SMBFS filesystem stats in the lcdproc client.

test-menu

Enable test menu support for the lcdproc server.

truetype

Enable support for media-libs/freetype in the glcd driver.

app-misc/libdatovka

openssl

Use openssl backend

app-misc/lirc

audio

Support using an audio device connected to an IR receiver

devinput

Support the devinput input device

ftdi

Support FTDI devices

gtk

Include GTK support which enables the use of lirc-setup

inputlirc

Add a dependency on app-misc/inputlircd

uinput

Enable support for uinput

app-misc/mc

edit

Compile and install the mcedit application

sftp

Add support for sftp (uses net-libs/libssh2 for it).

slang

Use sys-libs/slang instead of sys-libs/ncurses.

app-misc/mime-types

nginx

Enable mime-types support for www-servers/nginx package

app-misc/mosquitto

bridge

Enable bridge support in the MQTT broker.

persistence

Store messages and subscriptions to a file.

srv

Include SRV lookup support.

websockets

Support the WebSocket protocol.

app-misc/muttprint

doc

Builds documentation

app-misc/neofetch

X

Enable support for detecting DEs, WMs, screen resolutions, and showing images from an X terminal

app-misc/nnn

8contexts

Enable 8 contexts (instead of 4)

colemak

Key bindings for Colemak keyboard layout

colemak-dh

Key bindings for Colemak-DH keyboard layout

emoji

Display icons using emoji

gitstatus

Add git status column to the detail view

icons

Display icons using icons-in-terminal

namefirst

Print filenames first in the detail view

nerdfonts

Display icons using nerdfonts icons

qsort

Use Alexey Tourbin's quick sort implementation

restorepreview

Add pipe to close and restore preview-tui for internal undetached edits

app-misc/note

general

Add support for ascii flatfile backend

text

Add support for text backend

app-misc/ola

ftdi

Support FTDI devices

http

Enable built-in Web UI

rdm-tests

Install RDM responder tests

app-misc/pax-utils

python

Install a more powerful/faster version of lddtree

app-misc/recoll

camelcase

Enable indexing for camelCase sentences and words

chm

Enable CHM file support via dev-python/pychm

inotify

Use the Linux Kernel notification subsystem for monitoring file alterations in realtime

session

Stop monitoring file alterations when X11 session terminates

webengine

Use dev-qt/qtwebengine for fancy result list display

app-misc/rlwrap

debug

Enable debug

app-misc/screen

multiuser

Enable multiuser support (by setting correct permissions)

nethack

Express error messages in nethack style

app-misc/screenfetch

X

Use the media-gfx/scrot package to take screenshots

app-misc/skim

tmux

Install sk-tmux script to run skim in a tmux pane

vim

Install vim plugin for skim

app-misc/sphinx

id64

use 64-bit document and word IDs

mariadb

Add mariadb database support

stemmer

Enable language stemming support

app-misc/task

sync

Enable "task sync" support

app-misc/tmux

utempter

Include libutempter support

app-misc/tracker

miners

Install the app-misc/tracker-miners package for actual data mining support for tracker

stemmer

Add word stemming via dev-libs/snowball-stemmer.

app-misc/tracker-miners

cue

Enable cue sheet parsing

gsf

Enable gnome-extra/libgsf based data extractor and for ODT.

iptc

Enable extraction of IPTC data from pictures

iso

Enable extraction of metadata from ISO disk images

playlist

Add support for playlists

xps

Add support for XPS file format through app-text/libgxps.

app-misc/unfoo

minimal

Do not install all support archive binaries

app-misc/vcontrold

vclient

Build the vclient helper program to talk to vcontrold

vsim

Build the vsim helper program (simulates the heating's answers, for development and debugging)

app-misc/vifm

developer

Enable features of interest to developers

extended-keys

Support for extended keys (arrows, home etc)

gtk

Use gtk+ to determine mimetypes

vim

Install the vifm vim plugin and vim-compatible documentation

app-misc/worker

avfs

Enable support for sys-fs/avfs

app-mobilephone/gammu

curl

Enables curl support

irda

Enables infrared support

mysql

Use mysql for data storage

nls

Enable native language support

odbc

Use ODBC as DB connector

postgres

Use PostgreSQL for data storage

usb

Enable USB suport

app-mobilephone/gnokii

ical

Enable support for dev-libs/libical

irda

Enable infrared support

pcsc-lite

Enable smartcard support with sys-apps/pcsc-lite

sms

Enable SMS support (build smsd)

app-mobilephone/scrcpy

lto

Build with Link Time Optimization (LTO)

pipewire

Enable support for the media-video/pipewire audio backend

app-mobilephone/smstools

stats

Enable statistic reporting

app-office/abiword

collab

Enable collaborative editing plugin

goffice

Enable goffice plugin

grammar

Enable grammar checking via dev-libs/link-grammar

map

Enable world map support through media-libs/libchamplain

math

Enable support for x11-libs/gtkmathview

ots

Enable Text Summarizer plugin

plugins

Enable plugins build (see http://www.abisource.com/wiki/PluginMatrix for more information). If your file cannot be opened due lack of support, try enabling this.

redland

Enables support redland and raptor libs.

thesaurus

Enable thesaurus support

wordperfect

Enable wordperfect file support via app-text/libwpd

app-office/calcurse

caldav

Support CalDAV

app-office/calligra

activities

Enable kactivities support

charts

Build chartshape plugin for creating business charts with dev-libs/kdiagram

gemini

Enable tablet and 2:1 devices support

import-filter

Enable support for various import filter file formats like WordPerfect, Visio and Apple Keynote

lcms

Build colorengine plugins using media-libs/lcms

okular

Enable bindings for kde-apps/okular

phonon

Build stage/eventplugins and videoshape plugin using media-libs/phonon

spacenav

Enable support for the 3Dconnexion spacenav input device via dev-libs/libspnav

app-office/calligraplan

activities

Enable kactivities support

holidays

Enable kde-frameworks/kholidays integration

kwallet

Enable access to encrypted OpenDocument files with kde-frameworks/kwallet storage

app-office/glabels

barcode

Enable barcode support through external libraries.

app-office/gnucash

aqbanking

Connect to some internet banks via AqBanking

quotes

Enable online stock quote retrieval

register2

Use the new register (Experimental)

app-office/gnumeric

libgda

Enable database support through gnome-extra/libgda.

perl

Enable perl plugin loader.

app-office/grisbi

goffice

enable goffice graphic support

app-office/kexi

experimental

Enable features deemed experimental by upstream

marble

Enable displaying of maps using kde-apps/marble

mdb

Enable support for Microsoft Access database

app-office/kmymoney

activities

Enable kde-frameworks/kactivities integration

addressbook

Enable kde-apps/akonadi contact integration

hbci

Enable HBCI support using net-libs/aqbanking

holidays

Enable kde-frameworks/kholidays integration

app-office/kraft

pim

Enable support for KDE PIM resources integration

app-office/libalkimia

webengine

Enable online quotes using dev-qt/qtwebengine

app-office/libreoffice

base

Enable full support for LibreOffice Base databases (involves additional bundled libs)

clang

Use Clang compiler instead of GCC

coinmp

Use sci-libs/coinor-mp as alternative solver

googledrive

Enable support for remote files on Google Drive

mariadb

Prefer mariadb connector over mysql connector

odk

Build the Office Development Kit

pdfimport

Enable PDF import via the Poppler library

vulkan

Enable Vulkan usage via the skia library (clang recommended)

app-office/libreoffice-l10n

offlinehelp

Install help files locally instead of using the LibreOffice Wiki

app-office/lyx

aspell

Add support for aspell spellchecking

dia

Add support for diagrams (app-office/dia)

dot

Add support for DOT import (media-gfx/graphviz)

enchant

Add support for enchant spellchecking wrapper (both aspell and hunspell can be used by LyX).

gnumeric

Add support for importing Gnumeric/OpenOffice/MS Excel spreadsheets into LyX.

html

Add support for HTML import

hunspell

Add support for spellchecking based on hunspell and reuse system-wide OpenOffice dictionaries. This also enable thesaurus dictionaries not accessible via aspell.

monolithic-build

This should speed up compilation significantly when you have enough RAM (> 600 MB)

rcs

Add support for revision control via dev-vcs/rcs

rtf

Add support for RTF import/export packages

app-office/magicpoint

contrib

Install additional contributed scripts

app-office/mdbtools

glib

Use functions provided by dev-libs/glib, not built-in

app-office/planner

libgda

PostgreSQL support via gnome-extra/libgda

app-office/sc-im

ods

Add ods import support

plots

Add sci-visualization/gnuplot for plotting support

tmux

Use app-misc/tmux for clipboard copy/paste

wayland

Use gui-apps/wl-clipboard for clipboard copy/paste

X

Use x11-misc/xclip for clipboard copy/paste

xls

Add xls support

xlsx

Add xlsx support

app-office/scribus

boost

Enable support for Boost based enhancement

hunspell

Enable support for spell checking with app-text/hunspell

minimal

Don't install headers (only required for e.g. plug-in developers)

osg

3D rendering via dev-games/openscenegraph

scripts

Install the scripts

templates

Document templates

tk

Install tk based scripts e.g. FontSample.py

app-office/skrooge

activities

Enable kactivities support

app-office/texmacs

netpbm

Add support for media-libs/netpbm

app-office/texstudio

video

Use phonon for video embedding

app-pda/gtkpod

clutter

Enable clutter support for displaying coverart

app-portage/conf-update

colordiff

Use colors when displaying diffs (app-misc/colordiff)

app-portage/eix

debug

Build with upstream's CXXFLAGS/LDFLAGS for debugging support; not recommended for normal use.

doc

Create description of the eix cache file additionally in html format

sqlite

Compile in support for portage's sqlite backend; to actually use it you need additional configuration of portage and eix

app-portage/gemato

gpg

Install dependencies needed for OpenPGP signature verification support

pretty-log

Pull dev-python/rich to enable pretty logs

tools

Install additional utilities (benchmarks, hash testing tools, fast Manifest generators) to /usr/share/gemato.

app-portage/grs

server

Install all the tools building systems

app-portage/g-sorcery

bson

Support BSON file format for package DB

app-portage/kuroneko

scraper

Include the dependencies necessary for Bugzilla scraping.

app-portage/layman

cvs

Support dev-vcs/cvs based overlays

darcs

Support dev-vcs/darcs based overlays

git

Support dev-vcs/git based overlays

gpg

Support app-crypt/gnupg signed overlays lists and manifests

g-sorcery

Support app-portage/g-sorcery based overlays

mercurial

Support dev-vcs/mercurial based overlays

squashfs

Support mounting squashfs image overlays locally read-only

subversion

Support dev-vcs/subversion based overlays

sync-plugin-portage

Install the sys-apps/portage sync module

app-portage/nattka

depgraph-order

Process packages in depgraph order whenever possible.

app-portage/pfl

network-cron

Adds a cron job which does a weekly submit of the package database

app-portage/portage-utils

qmanifest

Build qmanifest applet, this adds additional dependencies for GPG, OpenSSL and BLAKE2B hashing

qtegrity

Build qtegrity applet, this adds additional dependencies for OpenSSL

app-portage/tatt

templates

Install template scripts to be used with tatt

app-shells/atuin

client

Enable the autin client

server

Enable the autin server

sync

Enable the server-sync feature in the autin client

app-shells/autojump

ipython

Add support for dev-python/ipython

app-shells/bash

bashlogger

Log ALL commands typed into bash; should ONLY be used in restricted environments such as honeypots

mem-scramble

Build with custom malloc/free overwriting allocated/freed memory

net

Enable /dev/tcp/host/port redirection

pgo

Optimize the build using Profile Guided Optimization (PGO)

plugins

Add support for loading builtins at runtime via 'enable'

app-shells/bash-completion

eselect

Support blacklisting of completions via 'eselect bashcomp'. This enables custom Gentoo patching of upstream completion loader.

app-shells/mksh

lksh

variant that uses POSIX-compliant arithmetics with the host “long” data type and is automatically in POSIX mode when called as /bin/sh

app-shells/nushell

dataframe

Dataframe feature for nushell

extra

Enable less stable or less common commands

app-shells/pdsh

rsh

This allows the use of rsh (remote shell) and rcp (remote copy) for authoring websites. sftp is a much more secure protocol and is preferred.

app-shells/pwsh-bin

pwsh-symlink

Install a pwsh symlink that points to pwsh-bin.

app-shells/shish

diet

Use dev-libs/dietlibc

app-text/atril

caja

Enable property page extension in mate-base/caja

dvi

Enable build-in DVI viewer

epub

Enable build-in DVI viewer using net-libs/webkit-gtk

synctex

Enable search highlighting through synctex (virtual/tex-base)

t1lib

Enable the Type-1 fonts for the build-in DVI viewer (media-libs/t1lib)

xps

Enable XPS viewer using app-text/libgxps

app-text/blogc

git

Build blogc-git-receiver tool

httpd

Build blogc-runserver tool

make

Build blogc-make tool

app-text/coolreader

wxwidgets

Use x11-libs/wxGTK instead of Qt5

app-text/crengine-ng

chm

Support chm format

fribidi

Support bidirectional text by dev-libs/fribidi

harfbuzz

Use media-libs/harfbuzz for kerning and ligatures

libunibreak

Use dev-libs/libunibreak for hyphenation

libutf8proc

Use dev-libs/libutf8proc for manipulating unicode strings

lto

Use link time optimization

app-text/crm114

mew

Add support for using the mewdecode mime decoder (app-emacs/mew)

normalizemime

Add support for using the normalizemime (mail-filter/normalizemime)

app-text/crqt-ng

chm

Support chm format

fribidi

Support bidirectional text by dev-libs/fribidi

harfbuzz

Use media-libs/harfbuzz for kerning and ligatures

libunibreak

Use dev-libs/libunibreak for hyphenation

libutf8proc

Use dev-libs/libutf8proc for manipulating unicode strings

app-text/crwx-ng

chm

Support chm format

fribidi

Support bidirectional text by dev-libs/fribidi

harfbuzz

Use media-libs/harfbuzz for kerning and ligatures

libunibreak

Use dev-libs/libunibreak for hyphenation

libutf8proc

Use dev-libs/libutf8proc for manipulating unicode strings

app-text/dblatex

inkscape

Use inkscape to convert SVG. Disable to use gnome-base/librsvg instead.

app-text/dictd

judy

Build Judy-based (dev-libs/judy) plugin implementing fast "exact" and especially "lev" strategies

minimal

Don't build server but dict client, dictzip and dictfmt only.

app-text/docbook-sgml-utils

jadetex

Add support for processing tex files produced by the TeX backend of Jade

app-text/docbook-xsl-ns-stylesheets

ruby

Install the Ruby-based dbtoepub script; requires an interpreter compatible with app-eselect/eselect-ruby.

app-text/docbook-xsl-stylesheets

ruby

Install the Ruby-based dbtoepub script; requires an interpreter compatible with app-eselect/eselect-ruby.

app-text/ebook-tools

lit2epub

Install lit2epub script

app-text/editorconfig-core-c

cli

Install command line interface.

app-text/enchant

aspell

Adds support for app-text/aspell spell checker

hunspell

Adds support for app-text/hunspell spell checker

nuspell

Adds support for app-text/nuspell spell checker

voikko

Adds support for dev-libs/libvoikko spell checker

app-text/evince

dvi

Enable the built-in DVI viewer

nautilus

Enable property page extension in gnome-base/nautilus

postscript

Enable support for PostScript and Adobe Illustrator documents with app-text/libspectre

spell

Enable inline spell check for annotations via app-text/gspell

xps

Enable XPS viewer using app-text/libgxps

app-text/foliate

handy

Use gui-libs/libhandy

app-text/ghostscript-gpl

unicode

Add support for unicode passwords via net-dns/libidn

app-text/groonga

abort

Enable query abortion

benchmark

Build benchmark programs

dynamic-malloc-change

Allow dynamic memory allocation change for testing

exact-alloc-count

Atomic counting for memory alloc count

fmalloc

Make memory allocation failed in specified condition for debug

futex

Use futex

libevent

Enable dev-libs/libevent used for suggestion

mecab

Use app-text/mecab for morphological analysis

msgpack

Enable dev-libs/msgpack used for suggestion

nfkc

Use nfkc based utf8 normalization

sphinx

Enable document generation by app-misc/sphinx

uyield

Build for detecting race conditions

zeromq

Enable net-libs/zeromq used for suggestion

app-text/htmltidy

deprecated

Install tools and header files which are now considered deprecated

app-text/hyperestraier

mecab

Enable app-text/mecab support for Estraier

app-text/kbibtex

webengine

Use dev-qt/qtwebengine for HTML previews

zotero

Enable support for synchronisation with zotero.org web service

app-text/kjots

speech

Enable text-to-speech support

app-text/lcdf-typetools

kpathsea

Enable integration with kpathsea search library (TeX related)

app-text/libebook

tools

Build file conversion tools

app-text/libgepub

webkit

Build with GepubWidget based on Webkit

app-text/libmwaw

tools

Build file conversion tools

app-text/libqxp

tools

Build file conversion tools

app-text/libstaroffice

tools

Build conversion tools

zlib

Enable support for compressed data

app-text/libwpd

tools

Build file conversion tools

app-text/libwps

tools

Build file conversion tools

app-text/mandoc

cgi

build man.cgi web plugin for viewing man pages

system-man

set as the default man provider

app-text/mathtex

png

Generate png images by default instead of gif

app-text/msort

heap

Use heap instead of alloca()

icu

Use dev-libs/icu instead of dev-libs/libutf8proc.

libuninum

Use dev-libs/libuninum for conversion.

app-text/mupdf

drm

Enable support for Digital rights management (DRM)

app-text/pandoc

embed-data-files

Embed data files in binary for relocatable executable.

trypandoc

Build trypandoc cgi executable.

app-text/pandoc-bin

pandoc-symlink

Install pandoc symlink that points to pandoc-bin

app-text/pdfgrep

unac

Removing accents and ligatures before search

app-text/pdfpc

gstreamer

Compile support for movie playback (media-libs/gstreamer)

soup

Compile support for REST server (net-libs/libsoup)

webkit

Enable viewing Markdown notes (net-libs/webkit-gtk)

app-text/pelican

markdown

Markdown support

app-text/podofo

boost

Add support for boost

tools

Build and install commandline tools.

app-text/poppler

boost

Use boost::small_vector for a serious performance gain

gpgme

Enable signatures handling with app-crypt/gpgme

nss

Enable signatures handling with dev-libs/nss

utils

Install command-line PDF converters and various utilities.

app-text/qpdfview

fitz

Use experimental fitz rendering, provided by app-text/mupdf, instead of poppler

synctex

Add support for searching TeX sources

app-text/robodoc

examples

Installs usage examples in /usr/share for Perl

app-text/sdcv

darkterm

Improve readability of color output on terminals with dark background.

app-text/sigil

plugins

Installed needed Python packages for using Sigil plugins

system-mathjax

Use the system-wide dev-libs/mathjax instead of bundled

app-text/stardict

advertisement

Enable stardict advertisements plugin

cal

Enable calendar support using cal program

dictdotcn

Enable dict.cn network plugin (for Chinese language)

espeak

Enable text to speech synthesizer plugin using app-accessibility/espeak-ng engine

flite

Enable text to speech synthesizer plugin using app-accessibility/flite engine

fortune

Enable plugin to read fortune messages using games-misc/fortune-mod. You may consider installing games-misc/fortune-mod-all to get all fortune messages.

gucharmap

Enable plugin for unicode symbols description using gnome-extra/gucharmap

htmlparse

Enable plugin to parse dictionaries with html content

info

Enable plugin to read info pages

man

Enable plugin to read manual pages

powerwordparse

Enable plugin to parse powerword dictionaries

pronounce

Install WyabdcRealPeopleTTS package (it is just many .wav files) to make StarDict pronounce English words

qqwry

Enable QQWry plugin, which provides information (in Chinese language) about geographical positions, owner, etc. for IP addresses

tools

Build and install dictionary management tools and converters from various dictionary formats

updateinfo

Enable plugin to check for stardict updates

wikiparse

Enable plugin to parse dictionaries in wikimedia format

wordnet

Enable wordnet plugin to find similar English words using lexical database

xdxfparse

Enable plugin to parse dictionaries in xdxf (XML Dictionary eXchange Format)

youdaodict

Enable youdao.com network plugin (for Chinese language)

app-text/sword

clucene

Use dev-cpp/clucene for lucene search support

app-text/tessdata_best

osd

Enable support orientation and script detection.

app-text/tessdata_fast

osd

Enable support orientation and script detection.

app-text/tessdata_legacy

math

Enable support for recognition of equations.

osd

Enable support orientation and script detection.

app-text/tesseract

float32

Support float for model training and text recognition (faster, requires less RAM)

opencl

Enable opencl support for speedup using GPU computation.

training

Install training applications to add support for new languages.

app-text/texlive

context

Add support for the ConTeXt format (dev-texlive/texlive-context)

extra

Add support for extra TeXLive packages

games

Add typesetting support for games (chess, etc.) (dev-texlive/texlive-games)

graphics

Add support for several graphics packages (pgf, tikz,...)

humanities

Add LaTeX support for the humanities (dev-texlive/texlive-humanities)

luatex

Add extra support for luatex

metapost

Add support for metapost: A tool for creating graphics in scalable PostScript

music

Add support for music typesetting (dev-texlive/texlive-music)

pdfannotextractor

Add dev-tex/pdfannotextractor support, for extracting annotations from PDF files

pstricks

Add pstricks packages (dev-texlive/texlive-pstricks)

publishers

Add support for publishers (dev-texlive/texlive-publishers)

science

Add typesetting support for natural and computer sciences (dev-texlive/texlive-mathscience)

tex4ht

Add support for dev-tex/tex4ht (for converting (La)TeX to (X)HTML, XML and OO.org)

texi2html

Add support for app-text/texi2html which converts texi files to HTML

xetex

Add support for XeTeX macros (dev-texlive/texlive-xetex)

app-text/texlive-core

luajittex

Add support for LuaJitTeX: LuaTeX based on LuaJIT which is usually faster.

xetex

Add support for XeTeX: a TeX system with Unicode and modern font technologies.

xindy

Add support for Xindy: A general-purpose index processor.

app-text/wdiff

experimental

Build experimental utilities (mdiff, unify, wdiff2)

app-text/webgen

builder

Enable programmatic HTML/XML generation

highlight

Enable syntax highlighting for certain plugins

markdown

Markdown support

app-text/writerperfect

abiword

Add support for abiword format using app-text/libabw

ebook

Add support for various ebook formats using app-text/libebook

epub

Add support for conversion to ePub format using app-text/libepubgen

freehand

Add support for freehand format using media-libs/libfreehand

gsf

Add support for structured files using gnome-extra/libgsf

keynote

Add support for keynote format using app-text/libetonyek

mspub

Add support to mspub format using app-text/libmspub

mwaw

Add support to mwaw formats using app-text/libmwaw

pagemaker

Add support to pagemaker formats using media-libs/libpagemaker

qxp

Add support for QuarkXpress documents using app-text/libqxp

visio

Add support for visio format using media-libs/libvisio

wpd

Add support for wpd format using app-text/libwpd

wpg

Add support for wpg format using app-text/libwpg

wps

Add support for wps format using app-text/libwps

zmf

Add support for Zoner Callisto/Draw documents format using media-libs/libzmf

app-text/wv

tools

Install optional utilities considered deprecated in favor of using AbiWord.

app-text/xmlto

text

Support conversion from XML to plain text

app-text/xpdf

cmyk

Include support for CMYK rasterization

i18n

Enable support non-UTF8 national charsets

icons

Generate desktop PNG icons using media-gfx/inkscape

libpaper

Use app-text/libpaper to get paper preferences

metric

Use A4 instead of US Letter paper size by default for PostScript output. This option has effect only if libpaper USE flag is disabled

opi

Include support for OPI (Open Prepress Interface) comments

textselect

Allow text selection

utils

Install command-line PDF converters and various utilities

app-text/zathura

synctex

Use libsynctex to get latex codeline from pdf

app-text/zathura-meta

cb

Install plug-in for ComicBook support

app-vim/gentoo-syntax

ignore-glep31

Remove GLEP 31 (UTF-8 file encodings) settings

app-xemacs/xemacs-packages-all

mule

Add multi-language support to XEmacs

dev-ada/aws

shared

Build shared library

wsdl

Used to convert ada to wsdl

dev-ada/gnatcoll-bindings

shared

Build shared library

static-pic

Build shared library

dev-ada/gnatcoll-core

shared

Build shared library

static-pic

Build static library with pic code

dev-ada/gnatcoll-db

db2ada

Build gnatcoll_db2ada

gnatinspect

Build gnatinspect

shared

Build shared library

sql

Build sql library

static-pic

Build shared library

xref

Build xref library

dev-ada/gpr

shared

Build shared library

static-pic

Build static library with pic code

dev-ada/gpr-unit-provider

shared

Build shared library

static-pic

Build static library with pic code

dev-ada/gtkada

shared

Build gtkada as shared library

static-pic

Build static library with pic code

dev-ada/langkit

shared

Build shared library

static-pic

Build static library with pic code

dev-ada/libadalang

static-pic

Build static library with pic code

dev-ada/libadalang-tools

shared

Build shared library

static-pic

Build static library with pic code

dev-ada/libgpr

shared

Build shared library

static-pic

Build static library with pic code

dev-ada/spawn

glib

Add support to dev-libs/glib-based mainloop.

shared

Build shared library

static-pic

Build static library with pic code

dev-ada/templates-parser

shared

Build shared library

dev-ada/xmlada

shared

Build shared library

static-pic

Build static library with pic code

dev-cpp/abseil-cpp

cxx17

Build with -DCMAKE_CXX_STANDARD=17 (required by some revdeps)

dev-cpp/benchmark

lto

Optimize the build using Link Time Optimization (LTO)

dev-cpp/cpp-httplib

brotli

Enable app-arch/brotli support

dev-cpp/eigen

cuda

Build with cuda support

dev-cpp/glog

gflags

Use dev-cpp/gflags for flag parsing

libunwind

Use libunwind library (sys-libs/libunwind or sys-libs/llvm-libunwind) instead of built-in fallback implementation for stack unwinding

dev-cpp/jwt-cpp

picojson

Enable use of dev-cpp/picojson

dev-cpp/libcmis

tools

Build client tool for testing and viewing features

dev-cpp/libjson-rpc-cpp

http-client

Build support for HTTP client using net-misc/curl

http-server

Build support for HTTP server using net-libs/libmicrohttpd

redis-client

Build support for Redis client using dev-libs/hiredis

redis-server

Build support for Redis server using dev-libs/hiredis

stubgen

Build header stub code generator (needed for development and when pregenerated headers are not bundled)

dev-cpp/msgpack-cxx

boost

Enable boost support

dev-cpp/opentelemetry-cpp

jaeger

Include the jaeger exporter

prometheus

include the Prometheus Client in the SDK

dev-cpp/sdbus-c++

systemd

Use external libsystemd instead of statically-linked build

tools

Install interface stub code generator

dev-db/etcd

server

Installs etcd daemon

dev-db/firebird

server

Install the server components of Firebird, not just the client

xinetd

Install ClassicServer

dev-db/mariadb

backup

Build mariadb-backup which supports SST and hot backup of InnoDB, Aria and MyISAM including compression and encryption

columnstore

Build the ColumnStore storage engine

extraengine

Add support for alternative storage engines (Archive, CSV, Blackhole, Federated(X), Partition)

galera

Enables galera replication

innodb-lz4

Enables lz4 compression methods for InnoDB/XtraDB

innodb-lzo

Enables lzo compression methods for InnoDB/XtraDB

innodb-snappy

Enables snappy compression methods for InnoDB/XtraDB using app-arch/snappy

jdbc

Enable the CONNECT engine to access foreign databases via JDBC

latin1

Use LATIN1 encoding instead of UTF8

mroonga

Add support for the Mroonga engine for interfacing with the Groonga text search

numa

Enable NUMA support using sys-process/numactl (NUMA kernel support is also required)

oqgraph

Add support for the Open Query GRAPH engine

pam

Enable the optional PAM authentication plugin for the server

profiling

Add support for statement profiling (requires USE=community).

rocksdb

Add support for RocksDB; a key/value, LSM database optimized for flash storage

s3

Build the S3 storage engine

server

Build the server program

sphinx

Add suport for the sphinx full-text search engine

sst-mariabackup

Add tools needed to support the mariabackup SST method

sst-rsync

Add tools needed to support the rsync SST method

systemtap

Build support for profiling and tracing using dev-util/systemtap

test

Install upstream testsuites for end use.

tokudb

Add support for TokuDB storage engine

yassl

Enable SSL connections and crypto functions using the bundled yaSSL

dev-db/mongodb

lto

Adds support for link time optimization

mongosh

Install the MongoDB shell from app-admin/mongosh-bin

tools

Install the MongoDB tools (mongoimport, mongodump...) from app-admin/mongo-tools

dev-db/mycli

ssh

Add support for connection over SSH tunnel

dev-db/mysql

cjk

Add CJK support for InnoDB fulltext search using app-text/mecab

client-libs

Build the client libraries from the server package instead of the C Connector packages (not recommended)

experimental

Build experimental features aka "rapid" plugins

latin1

Use LATIN1 encoding instead of UTF8

numa

Enable NUMA support using sys-process/numactl (NUMA kernel support is also required)

profiling

Add support for statement profiling (requires USE=community).

router

Build the MySQL router program

server

Build the server program

systemtap

Build support for profiling and tracing using dev-util/systemtap

test

Install upstream testsuites for end use.

dev-db/mysql-connector-c++

legacy

Build the legacy 1.x API as well as the DevX API

dev-db/oracle-instantclient

jdbc

Support for XA, Internationalization, and RowSet operations under JDBC

odbc

Libraries for enabling ODBC applications

precomp

"proc" binary and related files to precompile a Pro*C application

sdk

Header files and an example makefile for developing Oracle applications

sqlplus

The SQL*Plus command line tool for SQL and PL/SQL queries

tools

Data Pump, SQL*Loader and Workload Replay Client

dev-db/percona-server

cjk

Add CJK support for InnoDB fulltext search using app-text/mecab

latin1

Use LATIN1 encoding instead of UTF8

numa

Enable NUMA support using sys-process/numactl (NUMA kernel support is also required)

profiling

Add support for statement profiling (requires USE=community).

rocksdb

Add support for RocksDB; a key/value, LSM database optimized for flash storage

router

Build the MySQL router program

server

Build the server program

tokudb

Add support for TokuDB storage engine

tokudb-backup-plugin

Builds the TokuDB backup plugin

dev-db/pgbouncer

c-ares

Use c-ares as the DNS backend instead of evdns (libevent).

udns

Use udns as the DNS backend instead of evdns (libevent). Supports IPv4 only.

dev-db/pgpool2

memcached

Use memcached for query caching.

dev-db/phpmyadmin

setup

Installs the phpMyAdmin setup utility. Users who don't use the utility should disable this USE flag for security reasons as the setup tool was the target of various exploits in the past.

dev-db/postgis

address-standardizer

Normalize US and CA postal addresses

gtk

Build graphical interface for shp2pgsql (shp2pgsql-gui)

topology

Build topology spatial types and functions

dev-db/postgresql

llvm

Add support for llvm JIT engine

server

Disable to build and install the clients and libraries only.

uuid

Enable server side UUID generation (via dev-libs/ossp-uuid).

dev-db/psqlodbc

iodbc

Use dev-db/libiodbc. Disable to use dev-db/unixODBC.

dev-db/redis

tcmalloc

Use tcmalloc from dev-util/google-perftools for allocations.

dev-db/spatialite

geos

Add the sci-libs/geos library for exact topological tests

proj

Add the sci-libs/proj library for reprojection features

rttopo

Add the sci-geosciences/librttopo library for topology support

xls

Add the dev-libs/freexl library for xls import support

dev-db/sqldeveloper

sybase

Add support for the Sybase SQL Database Server

dev-db/sqlite

secure-delete

Enable overwriting of deleted content with zeros by default (http://sqlite.org/pragma.html#pragma_secure_delete), causing some performance penalty

tools

Install additional tools, among which are included: sqlite3-analyzer, sqlite3-changeset, sqlite3-db-dump, sqlite3-diff, sqlite3-rbu, sqlite3-expert and others.

dev-db/sqlitestudio

cli

Build CLI interface

dev-db/timescaledb

proprietary-extensions

Enable proprietary features/extensions licensed under the TimeScale License

dev-db/unixODBC

minimal

Disable bundled drivers and extra libraries (most users don't need these)

odbcmanual

Administrator, Internal Structure, Programmer and User documentation

dev-dotnet/dotnet-sdk-bin

dotnet-symlink

Install a dotnet symlink that points to dotnet-bin.

dev-embedded/avrdude

ftdi

Enable support for USB FTDI chips via dev-embedded/libftdi

dev-embedded/libftdi

tools

build ftdi_eeprom helper tool

dev-embedded/openocd

capstone

Use dev-libs/capstone for disassembly support

cmsis-dap

Support for CMSIS-DAP compliant adapters

dummy

Build the dummy port driver

ftdi

Enable support for USB FTDI chips via dev-embedded/libftdi

jlink

Build the SEGGER J-Link driver

parport

Enable support for parport JTAG devices

verbose-io

Verbose IO and comm JTAG and USB messages

dev-embedded/sdcc

avr

Add support for AVR -- not supported upstream

boehm-gc

Enable Hans Boehm's garbage collector dev-libs/boehm-gc

device-lib

Enable built of devices libraries

ds390

Add support for Dallas DS390

ds400

Add support for Dallas DS400

ez80-z80

Add support for EZ80-Z80

gbz80

Add support for Gameboy gbz80

hc08

Add support for Freescale/Motorola HC08 based

mcs51

Add support for Intel mcs51

mos6502

Add support for MOS 6502

mos65c02

Add support for MOS 65C02

non-free

Enable non-free runtime library parts

packihx

Enable Intel HEX files pack utility

pdk13

Add support for PDK13

pdk14

Add support for PDK14

pdk15

Add support for PDK15

pdk16

Add support for PDK16

pic14

Add support for Microchip 14 bits PICs

pic16

Add support for Microchip 16 bits PICs

r2k

Add support for Rabbit 2000

r2ka

Add support for Rabbit 2000A

r3ka

Add support for Rabbit 3000A

s08

Add support for Freescale/Motorola S08

sdbinutils

Enable SDCC library archive utilities sdar, sdranlib, sdnm

sdcdb

Enable SDCC source level debugger

sdcpp

Enable SDCC preprocessor based on GCC cpp

sm83

Add support for Gameboy SM83

stm8

Add support for STMicroelectronics STM8

tlcs90

Add support for TLCS-90

ucsim

Enable software simulator for microcontrollers

z180

Add support for Zilog Z180

z80

Add support for Zilog Z80

z80n

Add support for Zilog Z80N

dev-embedded/u-boot-tools

envtools

Build only the target-side environment tools

dev-embedded/urjtag

ftd2xx

Enable support for USB FTDI chips via dev-embedded/libftd2xx

ftdi

Enable support for USB FTDI chips via dev-embedded/libftdi

dev-games/cegui

devil

Build the DevIL based ImageCodec module

freeimage

Build the FreeImage based ImageCodec module

irrlicht

Enable the Irrlicht renderer

ogre

Enable the OGRE renderer

tinyxml

Enable the Tiny XML parser module

xerces-c

Enable the Xerces-C++ XML parser module

zip

Enable the Minizip resource provider

dev-games/godot

bullet

Enable the sci-physics/bullet module

deprecated

Enable support for deprecated features

raycast

Enable the raycast Editor module using media-libs/embree

runner

Build an additional binary optimized for running games (only relevant with USE=tools)

speech

Enable text-to-speech support

tools

Enable the Godot Editor for game development

webm

Enable the WebM module

dev-games/guichan

allegro

Build the Allegro frontend

dev-games/mygui

l10n_ru

Install some additional russian docs if 'doc' useflag enabled

ogre

Use the ogre render subsystem. (cannot combine with opengl)

opengl

Use the opengl render subsystem. (cannot combine with ogre)

plugins

Build MyGUI plugins

samples

Install MyGUI demos (needs ogre USE flag)

tools

Build the tools for development

dev-games/ode

double-precision

more precise calculations at the expense of speed

gyroscopic

enable gyroscopic term (may cause instability)

dev-games/ogre

assimp

Use media-libs/assimp to import assets from 3D files

boost

Enable boost support

bullet

Use sci-physics/bullet for physics plugin

cache

Enable GL state cache support

cg

NVIDIA toolkit plugin

deprecated

Build deprecated nodeless positioning of Lights and Cameras.

double-precision

More precise calculations at the expense of speed

egl

Use egl instead of glx

fine-granularity

Enable fine light mask granularity. This impacts on performance and should not be enabled unless an application really needs it.

freeimage

Support images via media-libs/freeimage

gl3plus

Build OpenGL 3+ RenderSystem

gles2

Build OpenGL ES 2.x RenderSystem

gles3

Enable OpenGL ES 3.x Features

json

Use dev-libs/rapidjson (needed by Hlms JSON materials)

legacy-animations

Use the skeletal animation from 1.x. It's much slower, but the new system is still experimental.

ois

Pull in Object-oriented Input System library dev-games/ois for samples

poco

When USE=threads, use poco for threading

resman-pedantic

Resource Manager PEDANTIC : require an explicit resource group. Case sensitive lookup. Some demos might not work with this setting. (default: case-insensitive + sensitive lookup in all groups)

tbb

When USE=threads, use tbb for threading

tools

Build and install AssimpConverter (assimp USE flag is enabled), MeshUpgrader, VRMLConverter and XMLConverter

dev-games/openscenegraph

collada

Enable DAE file support via dev-libs/collada-dom

dicom

Enable DICOM medical image file support via sci-libs/dcmtk

egl

Enable EGL support

fox

Build examples using x11-libs/fox library

gdal

Enable support for sci-libs/gdal library

las

Enable support for geospatial data LAS LiDAR format using sci-geosciences/liblas

openinventor

Build OpenInventor plugin

osgapps

Build osg applications

sdl2

Use media-libs/libsdl2 additionally to media-libs/libsdl

xrandr

Enable support for the X xrandr extension

dev-games/openscenegraph-openmw

collada

Enable DAE file support via dev-libs/collada-dom

dicom

Enable DICOM medical image file support via sci-libs/dcmtk

egl

Enable EGL support

fox

Build examples using x11-libs/fox library

gdal

Enable support for sci-libs/gdal library

las

Enable support for geospatial data LAS LiDAR format using sci-geosciences/liblas

openinventor

Build OpenInventor plugin

osgapps

Build osg applications

sdl2

Use media-libs/libsdl2 additionally to media-libs/libsdl

xrandr

Enable support for the X xrandr extension

dev-games/physfs

7zip

Enable 7zip/lzma archive support

grp

Enable Build Engine GRP archive support

hog

Enable Descent I/II HOG archive support

iso

Enable ISO9660 file support

mvl

Enable Descent I/II MVL archive support

qpak

Enable Quake I/II QPAK archive support

slb

Enable Independence War SLB archive support

vdf

Enable Gothic/Gothic II VDF archive support

wad

Enable Doom WAD archive support

dev-games/simgear

dns

Enable DNS resolver via net-libs/udns

gdal

Enable alternative terrain engine based on pagedLOD via sci-libs/gdal

subversion

Enable terrasync scenery downloader

dev-haskell/abstract-deque

usecas

Enable the reference implementation to use hardware compare-and-swap.

dev-haskell/aeson

cffi

Controls whether to include c-ffi bits or pure haskell. Default to False for security.

ordered-keymap

Use ordered @Data.Map.Strict@ for KeyMap implementation.

dev-haskell/aeson-pretty

lib-only

don't build 'aeson-pretty' executable.

dev-haskell/ansi-terminal

example

Build the example application.

dev-haskell/atomic-primops

debug

Enable extra internal checks.

dev-haskell/bifunctors

semigroups

You can disable the use of the `semigroups` package using `-f-semigroups`. Disabing this is an unsupported configuration, but it may be useful for accelerating builds in sandboxes for expert users.

tagged

You can disable the use of the `tagged` package using `-f-tagged`. Disabing this is an unsupported configuration, but it may be useful for accelerating builds in sandboxes for expert users.

dev-haskell/c2hs

regression

run regression tests

dev-haskell/cabal-install

lukko

Use @lukko@ for file-locking

native-dns

Enable use of the [resolv](https://hackage.haskell.org/package/resolv) & [windns](https://hackage.haskell.org/package/windns) packages for performing DNS lookups

dev-haskell/chell

color-output

use colors in program output

dev-haskell/citeproc

executable

Build citeproc executable

icu

Use Haskell bindings to the ICU library

dev-haskell/cmdargs

quotation

Build quote module

testprog

Build the test program

dev-haskell/comonad

indexed-traversable

You can disable the use of the `indexed-traversable` package using `-f-indexed-traversable`. Disabling this is an unsupported configuration, but it may be useful for accelerating builds in sandboxes for expert users. If disabled we will not supply instances of `FunctorWithIndex`

dev-haskell/contravariant

semigroups

You can disable the use of the `semigroups` package using `-f-semigroups`. Disabling this is an unsupported configuration, but it may be useful for accelerating builds in sandboxes for expert users.

statevar

You can disable the use of the `StateVar` package using `-f-StateVar`. Disabling this is an unsupported configuration, but it may be useful for accelerating builds in sandboxes for expert users.

tagged

You can disable the use of the `tagged` package on older versons of GHC using `-f-tagged`. Disabling this is an unsupported configuration, but it may be useful for accelerating builds in sandboxes for expert users.

dev-haskell/criterion

embed-data-files

Embed the data files in the binary for a relocatable executable

dev-haskell/crypto-api

all-cpolys

Build all the CMAC polynomes up to 10000 bits instead of just the usual ones

dev-haskell/cryptonite

integer-gmp

Whether or not to use GMP for some functions

target-attributes

use GCC / clang function attributes instead of global target options.

dev-haskell/dlist

werror

Enable -Werror

dev-haskell/entropy

halvm

Build for the HaLVM.

dev-haskell/foundation

experimental

enable building experimental features, known as highly unstable or without good support cross-platform

dev-haskell/hackage-security

lukko

Use @lukko@ for file-locking, otherwise use @GHC.IO.Handle.Lock@

dev-haskell/hashable

random-initial-seed

Randomly initialize the seed on every executable invocation. This is not a security feature and is intended only for testing (it can affect legitimate use cases).

dev-haskell/haskeline

terminfo

Use the terminfo package for POSIX consoles.

dev-haskell/hdbc-sqlite3

splitbase

Choose the new smaller, split-up package.

dev-haskell/http-api-data

text-show

Use text-show library for efficient ToHttpApiData implementation.

dev-haskell/httpd-shed

buildexamples

Build example executables.

dev-haskell/libyaml

no-unicode

Don't enable unicode output. Instead, unicode characters will be escaped.

system-libyaml

Use the system-wide libyaml instead of the bundled copy

dev-haskell/lpeg

rely-on-shared-lpeg-library

Do not build lpeg from source, but trust that lpeg is made available in other ways, e.g., through a system-wide installation. The loader will be replaced with a placeholder function that only emits a message.

dev-haskell/lua

system-lua

Use @pkg-config@ to discover library and include paths. Setting this flag implies `pkg-config`.

dev-haskell/monad-logger

template-haskell

Enable Template Haskell support.

dev-haskell/monad-par

chaselev

Use Chase-Lev Deques for higher-perf work-stealing.

dev-haskell/nats

binary

enable binary instances

hashable

enable hashable instances

template-haskell

enable template_haskell

dev-haskell/network

devel

using tests for developers

dev-haskell/parsec-numbers

parsec1

use dev-haskell/parsec1 instead of dev-haskell/parsec

dev-haskell/parsers

attoparsec

Enable the use of the `attoparsec` package

binary

You can disable the use of the `binary` package using `-f-binary`.

parsec

Enable the use of the `parsec` package

dev-haskell/persistent-sqlite

build-sanity-exe

Build a sanity check test executable.

dev-haskell/quickcheck

template-haskell

Enable additional test modules requiring Template Haskell support.

dev-haskell/quickcheck-classes

aeson

Enable the use of the `aeson` package. This may be useful for accelerating builds in sandboxes for expert users.

binary-laws

Include infrastructure for testing class laws of binary type constructors. Disabling `unary-laws` while keeping `binary-laws` enabled is an unsupported configuration.

semigroupoids

Enable the use of the `semigroupoids` package. This may be useful for accelerating builds in sandboxes for expert users.

semirings

Enable the use of the `semirings` package. This may be useful for accelerating builds in sandboxes for expert users.

unary-laws

Include infrastructure for testing class laws of unary type constructors.

vector

Enable the use of the `vector` package. This may be useful for accelerating builds in sandboxes for expert users.

dev-haskell/quickcheck-classes-base

binary-laws

Include infrastructure for testing class laws of binary type constructors. Disabling `unary-laws` while keeping `binary-laws` enabled is an unsupported configuration.

unary-laws

Include infrastructure for testing class laws of unary type constructors.

dev-haskell/sandi

conduit

Build with conduit

dev-haskell/sha

exe

Build a sha1 and a sha384 executable similar to 'md5sum'.

dev-haskell/shelly

lifted

run the tests against Shelly.Lifted

dev-haskell/simple-sendfile

allow-bsd

Allow use of BSD sendfile (disable on GNU/kFreeBSD)

dev-haskell/skein

big-endian

When manually selecting the endianness, use big-endian (default is little-endian).

force-endianness

Use a manually selected endian when compiling (see flag 'big-endian').

reference

Use the reference implementation instead of the optimized one.

dev-haskell/skylighting

executable

Build the skylighting executable.

dev-haskell/skylighting-core

executable

Build the skylighting executable.

dev-haskell/splitmix

optimised-mixer

Use JavaScript for mix32

dev-haskell/texmath

executable

Compile test executable.

server

Compile webserver.

dev-haskell/text-short

asserts

Enable runtime-checks via 'assert'

dev-haskell/tls

compat

Accept SSLv2 compatible handshake.

network

Use the base network library.

dev-haskell/transformers-base

orphaninstances

Build instances for orphan datatypes.

dev-haskell/unicode-collation

doctests

Run doctests as part of test suite. Use with: @--write-ghc-environment-files=always@.

executable

Build the unicode-collate executable.

dev-haskell/unix-compat

old-time

build against old-time package

dev-haskell/vector

boundschecks

Enable bounds checking

internalchecks

Enable internal consistency checks at the cost of a significant performance penalty

unsafechecks

Enable bounds checking in unsafe operations at the cost of a significant performance penalty

dev-haskell/vector-algorithms

bench

Build a benchmarking program.

boundschecks

Enable bounds checking.

internalchecks

Enable internal consistency checks at the cost of a significant performance penalty.

properties

Enable quickcheck tests.

unsafechecks

Enable bounds checking in unsafe operations at the cost of a significant performance penalty.

dev-haskell/void

safe

dissable effective but unsafe coersions

dev-haskell/wai-app-static

print

print debug info.

dev-haskell/warp

allow-sendfilefd

Allow use of sendfileFd (not available on GNU/kFreeBSD)

x509

Adds a dependency on the x509 library to enable getting TLS client certificates.

dev-haskell/wcwidth

cli

Enable command line tool

dev-haskell/yaml

examples

Install the haskell-yaml-examples executable

executable

Install the yaml2json and json2yaml executables

dev-haskell/yesod-form

network-uri

Get Network.URI from the network-uri package

dev-haskell/zip-archive

executable

Build the Zip executable.

dev-haskell/zlib

bundled-c-zlib

Use the bundled zlib C sources. Requires pkg-config to be False. For windows, this is the default.

non-blocking-ffi

The (de)compression calls can sometimes take a long time, which prevents other Haskell threads running. Enabling this flag avoids this unfairness, but with greater overall cost.

dev-java/ant

antlr

Enable ANTLR Ant tasks

bcel

Enable bcel (bytecode manipulation) Ant tasks

bsf

Enable support for Apache Bean Scripting Framework (dev-java/bsf)

commonslogging

Enable commons-logging Ant tasks

commonsnet

Enable commons-net Ant tasks

jai

Enable JAI (Java Imaging) Ant task

javamail

Enable JavaMail Ant task

jdepend

Enable Jdepend Ant tasks

jmf

Enable JMF (Java Media Framework) Ant tasks

jsch

Disable Jsch (ssh, scp and related) Ant tasks

junit

Enable JUnit Ant tasks

junit4

Enable JUnit4 Ant tasks

junitlauncher

Enable JUnit5 Ant tasks

log4j

Enable Apache log4j Ant tasks

oro

Enable Apache Oro Ant tasks

regexp

Enable Apache Regexp Ant tasks

resolver

Enable Apache Resolver Ant tasks

swing

Enable Swing Ant tasks

testutil

Enable optional test util classes

xz

Enable XZ Ant tasks

dev-java/commons-logging

log4j

Add optional support for log4j

dev-java/dom4j

jaxen

Includes org.jaxen.dom4j package

dev-java/eclipse-ecj

ant

Support using ecj in Ant builds via dev-java/ant-eclipse-ecj

dev-java/emma

launcher

Install /usr/bin/emma. Collides with sci-biology/emboss.

dev-java/icedtea

cacao

Use the CACAO virtual machine rather than HotSpot.

cups

Link against the CUPS library at compile time, rather than using it dynamically at runtime.

headless-awt

Don't install the X backend for AWT, needed by some GUIs (used to be X flag)

jamvm

Use the JamVM virtual machine rather than HotSpot.

jbootstrap

If possible, recompile the final IcedTea executables with itself.

kerberos

Link against Kerberos in order to obtain the cache location.

pax-kernel

Apply patch needed for pax enabled kernels.

pch

Build using pre-compiled headers.

sctp

Build the SCTP NIO channel implementation against lksctp

shenandoah

Include the Shenandoah ultra-low pause time garbage collector (-XX:+UseShenandoahGC) (arm64 and x86_64 only)

smartcard

Build the PCSC driver against pcsc-lite

system-lcms

Build against the system LCMS installation rather than the in-tree copy.

zero

Enable Zero assembler port (usually for non-HotSpot architectures)

dev-java/icedtea-bin

headless-awt

Don't install the X backend for AWT, needed by some GUIs (used to be X flag)

dev-java/jaxen

dom4j

Includes org.jaxen.dom4j package

jdom

Includes org.jaxen.jdom package

xom

Includes org.jaxen.xom package

dev-java/junit

migration-support

Include the junit-jupiter-migrationsupport module, which helps with migration from JUnit 4 to JUnit Jupiter

suite

Include the JUnit Platform Suite Engine, which adds test suite support

vintage

Include JUnit Vintage, which allows JUnit 5 to run JUnit 3 and JUnit 4 tests

dev-java/openjdk

headless-awt

Don't install the X backend for AWT, needed by some GUIs

javafx

Import OpenJFX modules at build time, via dev-java/openjfx

jbootstrap

Build OpenJDK twice, the second time using the result of the first

lto

Enable Link Time Optimization (LTO)

source

Install JVM sources

system-bootstrap

Bootstrap using installed openjdk

systemtap

Enable SystemTAP/DTrace tracing

dev-java/openjdk-bin

headless-awt

Don't install the X backend for AWT, needed by some GUIs (used to be X flag)

source

Install JVM sources

dev-java/openjdk-jre-bin

headless-awt

Don't install the X backend for AWT, needed by some GUIs (used to be X flag)

dev-java/openjfx

media

Compile media module, based on gstreamer-minimal (does not pull gstreamer)

source

Install JavaFX sources

dev-java/pdfbox

tools

Build and install pdfbox-tools

dev-java/protobuf-java

system-protoc

Use protoc provided by dev-libs/protobuf

dev-java/rxtx

lfd

Installs and uses LockFileServer daemon (lfd)

dev-java/sbt

binary

Install from (Gentoo-compiled) binary instead of building from sources. Set this when you run out of memory during build.

dev-lang/algol68g

mpfr

Add support for multiprecision floating point rouding

dev-lang/ammonite-repl-bin

scala2-13

Install Ammonite for Scala 2.13

scala3-0

Install Ammonite for Scala 3.0

scala3-1

Install Ammonite for Scala 3.1

scala3-2

Install Ammonite for Scala 3.2

dev-lang/bas

lr0

Use the LR0 parser instead of the recursive descending parser

dev-lang/crystal

debug

Build each module as a separate object file. Speeds build up.

dev-lang/erlang

kpoll

Enable kernel polling support

dev-lang/gdl

eigen

Build matrix manipulation with dev-cpp/eigen

glpk

Use GNU Linear Programming Kit sci-mathematics/glpk

gshhs

Add support for projection adn continent maps with sci-geosciences/gshhs-data

hdf

Add support for the Hierarchical Data Format v.4

proj

Add support for sci-libs/proj (geographic projections)

shapelib

Add support for manipulating ESRI Shapefiles with sci-libs/shapelib

udunits

Add support for manipulating units of physical quantities

dev-lang/gforth

check

Enable build-time sanity check.

dev-lang/ghc

binary

Install the binary version directly, rather than using it to build the source version.

elfutils

Enable DWARF-based backtraces using dev-libs/elfutils.

ghcbootstrap

Internal: Bootstrap GHC from an existing GHC installation.

ghcmakebinary

Internal: Build binary friendly for redistribution.

gmp

Use dev-libs/gmp for integer operations (works faster, but an external depend).

llvm

Pull in dependencies for the sys-devel/llvm codegen backend.

numa

Enable NUMA thread balancing policy using sys-process/numactl.

unregisterised

Create an unregisterised build in which only the C codegen backend will be available.

dev-lang/gnat-gpl

ada

Build the ADA language (GNAT) frontend

bootstrap

Used to bootstrap gnat-gpl

cet

Enable support for Intel Control Flow Enforcement Technology (CET)

d

Enable support for the D programming language

default-stack-clash-protection

Build packages with stack clash protection on by default

default-znow

Request full relocation on start from ld.so by default

fixed-point

Enable fixed-point arithmetic support for MIPS targets in gcc (Warning: significantly increases compile time!)

go

Build the GCC Go language frontend.

graphite

Add support for the framework for loop optimizations based on a polyhedral intermediate representation

libssp

Build SSP support into a dedicated library rather than use the code in the C library (DO NOT ENABLE THIS IF YOU DON'T KNOW WHAT IT DOES)

lto

Build using Link Time Optimizations (LTO)

nptl

Enable support for Native POSIX Threads Library, the new threading module (requires linux-2.6 or better usually)

objc

Build support for the Objective C code language

objc++

Build support for the Objective C++ language

objc-gc

Build support for the Objective C code language Garbage Collector

pgo

Build GCC using Profile Guided Optimization (PGO)

rust

Build support for the Rust language, installs gccrs.

sanitize

Build support for various sanitizer functions (ASAN/TSAN/etc...)

ssp

Build packages with stack smashing protector on by default

systemtap

enable systemtap static probe points

vtv

Build support for virtual table verification (a C++ hardening feature)

dev-lang/gnucobol

json

Enable support for JSON template formatting via dev-libs/json-c

dev-lang/idris2

chez

build using dev-scheme/chez

racket

build using dev-scheme/racket

test-full

pull in depedndencies to run all tests

dev-lang/inform

tools

Install blorbtools for manipulating Blorb files

dev-lang/janet

static-libs

install janet static library archive, you must enable this flag for using `jpm build`

dev-lang/jerryscript

debugger

Install jerry-debugger

dev-lang/jsonnet

custom-optimization

Build with user-specified compiler optimizations (-Os, -O0, -O1, -O2, -O3) from CFLAGS (unsupported)

dev-lang/lazarus

extras

Build a lot of extra packages, including lhelp chm viewer program.

gtk2

Use gtk:2 for widgets.

gui

Build GUI IDE.

minimal

Don't build extra packages from the bigide component

dev-lang/logtalk

fop

Support for generating pdf documentation using fop

xslt

Support for generating html documentation using xslt

dev-lang/lua

deprecated

make deprecated data structures/routines available

dev-lang/luajit

lua52compat

Enable some upwards-compatible features from Lua 5.2 that are unlikely to break existing code.

dev-lang/mercury

erlang

Support Mercury Erlang grade

trail

Support Mercury trail grades

dev-lang/mercury-extras

tommath

Enable support for tommath library

dev-lang/mlton

binary

install a binary version

bootstrap-smlnj

Boostrap mlton with dev-lang/smlnj (takes a long time)

pax-kernel

Enable if the user plans to run the package under a pax enabled hardened kernel

stage3

After bootstrap building mlton with dev-lang/smlnj, rebuild mlton with the second stage build of mlton (recommended).

dev-lang/moarvm

asan

Enable clang's Address Sanitizer functionality. Expect longer compile time.

clang

Use clang compiler instead of GCC

jit

Enable Just-In-Time-Compiler. Has no effect except on AMD64 and Darwin.

optimize

Enable optimization via CFLAGS

ubsan

Enable clang's Undefined Behavior Sanitizer functionality. Expect longer compile time.

dev-lang/mono

pax-kernel

Enable if the user plans to run the package under a pax enabled hardened kernel

xen

Make mono generate code that is considerably faster on xen VMs but slightly slower on for normal systems.

dev-lang/neko

apache

Build Apache modules

dev-lang/nim

experimental

Apply experimental patches

test-js

Enable tests that require Node.js

dev-lang/nqp

clang

Toggle usage of the clang compiler in conjunction with MoarVM

moar

Build the MoarVM backend (experimental/broken)

dev-lang/ocaml

flambda

Enables the Flambda optimizer: A new intermediate representation (introduced in ocaml 4.03) in the depths of the compiler designed to allow for better inlining.

spacetime

Enables the Spacetime memory profiler. See https://caml.inria.fr/pub/docs/manual-ocaml/spacetime.html for more information.

dev-lang/perl

ithreads

Enable Perl threads, has some compatibility problems

quadmath

Enable 128bit floating point arithmetic via libquadmath

dev-lang/php

apparmor

Support FPM application confinement through sys-libs/libapparmor

argon2

Enable password hashing algorithm from app-crypt/argon2

avif

Enable AVIF support in bundled libgd

bcmath

Enable the BCMath Arbitrary Precision Mathematics extension

cli

Enable the Command-Line Interface (CLI) SAPI

coverage

Include gcov symbols for test coverage and lcov reports. Only useful for extension developers, and requires GCC.

ctype

Enable the Character type checking (ctype) extension

embed

Enable embed SAPI

enchant

Enable the Enchant spelling library extension using app-text/enchant

ffi

Enable the Foreign Function Interface (FFI) extension using dev-libs/libffi

fileinfo

Enable the File Information extension

filter

Enable the Data Filtering extension

flatfile

Add dbm support for flat files

fpm

Enable the FastCGI Process Manager SAPI

gd

Enable the Image Processing and GD extension (requires media-libs/libjpeg-turbo and media-libs/libpng)

inifile

Add dbm support for .ini files

intl

Enables the intl extension for extended internalization support

jit

Enable PCRE JIT support

json

Enable the JavaScript Object Notation extension

ldap-sasl

Add SASL support for the PHP LDAP extension using dev-libs/cyrus-sasl

lmdb

Enable support for dev-db/lmdb db backend

opcache

Enables built-in opcode cache, replacing pecl-apc et al.

pcntl

Enable the Process Control extension

pdo

Enable the PHP Data Objects extension

phar

Enables the phar extension to provide phar archive support

phpdbg

Enable the PHP Debug Command Line SAPI (like gdb for php)

session-mm

Include dev-libs/mm support for session storage

sharedmem

Enable the shmop extension

simplexml

Enable the SimpleXML extension

sodium

Enable support for crypto through dev-libs/libsodium

sysvipc

Enable the PHP System-V semaphore, shared memory and IPC extension

tokenizer

Add support for the PHP file parser

tokyocabinet

Enable support for dev-db/tokyocabinet db backend

webp

Enable webp support for GD in php-7.x

xmlreader

Enable the XMLReader extension

xmlwriter

Enable the XMLWriter extension

xslt

Build the XSL extension

dev-lang/polyml

portable

Build the portable interpreter version of Poly/ML instead of native

dev-lang/python

bluetooth

Build Bluetooth protocol support in socket module

ensurepip

Install the ensurepip module that uses bundled wheels to bootstrap pip and setuptools (if disabled, it will be only possible to use venv `--without-pip`)

libedit

Link readline extension against dev-libs/libedit instead of sys-libs/readline

lto

Optimize the build using Link Time Optimization (LTO)

pgo

Optimize the build using Profile Guided Optimization (PGO) by running Python's test suite and collecting statistics based on its performance. This will take longer to build.

valgrind

Disable pymalloc when running under dev-util/valgrind is detected (may incur minor performance penalty even when valgrind is not used)

wininst

Install Windows executables required to create an executable installer for MS Windows

dev-lang/python-exec

native-symlinks

Install generic symlinks like python and python3. If this flag is disabled, only versioned python3.X executables will be available to end users and ebuilds not using python eclasses.

dev-lang/qu-prolog

pedro

Pedro subscription/notification communications system

dev-lang/R

lto

Use link-time optimization for R and its recommended packages.

dev-lang/rakudo

clang

Use Clang to compile the MoarVM backend

moar

Use the MoarVM as backend

dev-lang/ruby

rdoc

Install dev-ruby/rdoc after installing Ruby.

rubytests

Install ruby tests that can only be run after ruby is installed

systemtap

Enable SystemTAP/DTrace tracing

dev-lang/rust

clippy

Install clippy, Rust code linter

dist

Install dist tarballs (used for bootstrapping)

lto

Optimize the build using Link Time Optimization (LTO)

miri

Install miri, an interpreter for Rust's mid-level intermediate representation (requires USE=nightly, sometimes is broken)

nightly

Enable nightly (UNSTABLE) features (NOTE: it does not install nightly version, just enables features marked as nightly at time of release)

parallel-compiler

Build a multi-threaded rustc (experimental, not tested by upstream)

profiler

Build the profiler runtime and rust-demangler tool (needed for '-C profile-generate' or '-C instrument-coverage' codegen opts)

rust-analyzer

Install rust-analyzer, A Rust compiler front-end for IDEs (language server)

rustfmt

Install rustfmt, Rust code formatter

rust-src

Install rust-src, needed by developer tools and for build-std (cross)

system-bootstrap

Bootstrap using installed rust compiler

system-llvm

Use the system LLVM installation

wasm

Build support for the wasm32-unknown-unknown target

dev-lang/rust-bin

clippy

Install clippy, Rust code linter

rust-analyzer

Install rust-analyzer, A Rust compiler front-end for IDEs (language server)

rustfmt

Install rustfmt, Rust code formatter

rust-src

Install rust-src, needed by developer tools and for build-std (cross)

dev-lang/scala

binary

Install from (Gentoo-compiled) binary instead of building from sources. Set this when you run out of memory during build.

dev-lang/spidermonkey

clang

Use Clang compiler instead of GCC

debug

Enable assertions to allow for easier debugging of programs that link to spidermonkey -- note this will often crash software on regular end-user systems

lto

Enable Link Time Optimization (LTO)

dev-lang/swig

ccache

build ccache-swig(a fast compiler cache)

dev-lang/swi-prolog

archive

Use libarchive for extension packs

cli

Add support for CLI interfaces based on readline and libedit

ipc

Add support for TIPC inter-process communication

pgo

Optimize the build using Profile Guided Optimization (PGO)

uuid

Use ossp-uuid for UUID pack

yaml

Use libyaml for YAML pack

dev-lang/vala

valadoc

Installs valadoc documentation generation tool

dev-lang/xsb

mariadb

Enable support for the mariadb database backend

dev-lang/yap

R

Enable support for connecting R to Prolog

raptor

Enable support for Raptor RDF syntax libarary

dev-libs/aml

examples

Build and install examples

dev-libs/antlr-c

debugger

Compiles debug info into the library

dev-libs/apache-arrow

brotli

Enable brotli compression support

compute

Build the Arrow Compute Modules

dataset

Build the Arrow Dataset Modules

json

Enables read/write json format

parquet

Enables read/write parquet data format

re2

Build with support for regular expressions using the re2 library

dev-libs/appstream

apt

Enables Debians APT support

dev-libs/appstream-glib

fonts

Enable fonts support for appstream-builder.

stemmer

Add word stemming via dev-libs/snowball-stemmer.

dev-libs/apr

old-kernel

Enable compatibility with older kernels

urandom

Use /dev/urandom instead of /dev/random

dev-libs/apr-util

nss

Install apr_crypto_nss module

openssl

Install apr_crypto_openssl module

dev-libs/atcore

gui

Build test GUI

dev-libs/bitset

tcmalloc

Use tcmalloc from dev-util/google-perftools for allocations

dev-libs/boehm-gc

large

optimize for large heap size (also increases max root sets)

dev-libs/boost

context

Build and install the Boost.Context (and Boost.Fiber) library and all other Boost libraries that depend on it

debug

Build and install only the debug version of the Boost libraries. Only enable this flag if you're developing against boost.

doc

Install the full API documentation documentation. This takes over 200MB of extra disk space.

nls

Build libboost_locale. This library requires compatible C library interfaces, which might not be provided by uClibc or other embedded libraries.

numpy

Optionally build NumPy extensions when Boost.Python is enabled

stacktrace

Build the full Boost.Stacktrace dynamic library instead of relying on the header-only implementation

tools

Build and install the boost tools (bcp, quickbook, inspect, wave)

dev-libs/botan

boost

Use dev-libs/boost

tools

Install optional tools for e.g. hashing

dev-libs/check

subunit

Enable support for the subunit unit test protocol

dev-libs/crypto++

asm

Support assembly hand optimized crypto functions (i.e. faster run time)

dev-libs/cyberjack

tools

Build and install optional management tools.

dev-libs/cyrus-sasl

authdaemond

Add Courier-IMAP authdaemond unix socket support (net-mail/courier-imap, mail-mta/courier)

ldapdb

Enable ldapdb plugin

openldap

Add ldap support for saslauthd

sample

Enable sample client and server

srp

Enable SRP authentication

urandom

Use /dev/urandom instead of /dev/random

dev-libs/date

only-c-locale

Build only the C locale

dev-libs/dbus-c++

ecore

Use Ecore integration

glib

Use glib integration

dev-libs/eekboard

libcanberra

Enable support for media-libs/libcanberra

xtest

Enable support for x11-libs/libXtst

dev-libs/efl

avif

Enable AVIF image loader

bmp

Enable WBMP image loader

dds

Enable DDS image loader

drm

Enable DRM engine

eet

Enable Eet image loader

efl-one

Combine multiple core libraries into one libefl.so

fribidi

Enable bidirectional text support

glib

Enable dev-libs/glib support

harfbuzz

Enable complex text shaping and layout support

hyphen

Enable text hyphenation support

ibus

Enable Intelligent Input Bus

ico

Enable Ico image loader

json

Enable lottie animation support

mono

Enable mono bindings

physics

Enable Bullet physics effects and support

pmaps

Enable PMAPS image loader

psd

Enable PSD image loader

scim

Enable Smart Common Input Method

system-lz4

Use system liblz4 instead of bundled one

tga

Enable Tga image loader

tgv

Enable Tgv image loader

tslib

Enable x11-libs/tslib for touchscreen events

unwind

Enable debug support via sys-libs/libunwind

xcf

Enable XCF image loader

xim

Enable X Input Method

xpresent

Enable x11-libs/libXpresent support

dev-libs/elfutils

debuginfod

Enable debuginfod support, both the debuginfod server and the libdebuginfod client library

lzma

Support automatic decompression of LZMA-compressed files and kernel images

utils

Install command-line utilities (all the eu-* programs)

dev-libs/fcgi

html

Install HTML documentation

dev-libs/folks

telepathy

Load contacts from the Telepathy framework

utils

Build the folks-inspect utility

dev-libs/fstrm

utils

Build fstrm utility programs

dev-libs/gf2x

custom-tune

Extra long compile time for tuning hardware specific low-level routines

fft

Build an FFT API for multiplication of 2 polynomials over GF(2)

dev-libs/gjs

sysprof

Enable profiling data capture support using dev-util/sysprof-capture

dev-libs/glib

dbus

Enable dependencies required by glib libraries using dbus service to manage settings saving

elf

Enable support for listing and extracting from ELF resource files with gresource tool

mime