Global USE flags

Flag Description Packages
imap 2
ldap 2
mysql 3
postgres 3
session 2
sqlite 2
systemd 4
test 15

Local USE flags

dev-lang

php

Flag Description
${IUSE}
acl
apache2
apparmor
argon2
avif
bcmath Add support for libbcmath
berkdb
bzip2
calendar
cdb
cgi
cjk
cli Enable CLI SAPI
coverage Include gcov symbols for test coverage and lcov reports. Only useful for extension developers, and requires GCC.
crypt
ctype Enable ctype functions
curl
debug
embed Enable embed SAPI
enchant Add supports Enchant spelling library.
exif
ffi
fileinfo Add fileinfo extension support
filter Add filter extension support
firebird
flatfile Add dbm support for flat files
fpm Enable the FastCGI Process Manager SAPI
ftp
gd Adds support for gd (bundled with PHP)
gdbm
gmp
hash Enable the hash extension
iconv
inifile Add dbm support for .ini files
intl Enables the intl extension for extended internalization support
iodbc
ipv6
jit
json Enable JSON support
kerberos
ldap-sasl Add SASL support for the PHP LDAP extension
libedit
libmysqlclient Use libmyslclient driver for mysql, mysqli, PDO_Mysql (not recommended)
libressl
lmdb
mhash
mssql
mysqli
nls
oci8-instant-client
odbc
opcache Enables built-in opcode cache, replacing pecl-apc et al.
pcntl Add support for process creation functions
pdo Enable the bundled PDO extensions
phar Enables the phar extension to provide phar archive support
phpdbg
posix
qdbm
readline
recode
selinux
session-mm
sharedmem Add support for shared memory use
simplexml Support for SimpleXML
snmp
soap
sockets
sodium
spell
ssl
sybase-ct Add support for Sybase-CT
sysvipc Support for System V-compatible inter-process communication
threads
tidy
tokenizer Add support for the PHP file parser
tokyocabinet
truetype
unicode
vpx Enable webp support for GD in php-5.x
wddx Add support for Web Distributed Data eXchange
webp
xml
xmlreader Enable XMLReader support
xmlrpc
xmlwriter Enable XMLWriter support
xpm
xslt Enable the XSL extension
zip
zlib

media-sound

tidal-hifi-bin

Flag Description
wayland

net-mail

mailman

Flag Description
cron Installs cron file
html2text Enable html2text
whoosh Enable Whoosh
xapian Enable Xapian

z-push

Flag Description
caldav support Caldav
carddav support Carddav
memcached

sys-apps

systemd-custom-timer

Flag Description
clamav-unofficial-sigs Install timer to update clamav-unofficial-sigs
dhparams Install timer to update dhparams
geoip Install timer to run geoipupdate.sh

sys-kernel

rt-sources

Flag Description
deblob Remove binary blobs from kernel sources to provide libre license compliance.