Global USE flags

Flag	Description	Packages
debug		7
doc		7
examples		3
lua		2
luajit		11
lz4	Enable support for compressed pcap logging using the LZ4 algorithm	2
sasl		2
ssl	Enable HTTPS module for http. Enable SSL/TLS support for POP3/IMAP/SMTP for mail.	3
static-libs		9
syslog	Use syslog for error messages	2
systemd		6
test		15
threads		2

Category USE flags

app-metrics

Flag	Description	Packages
pie		3

sys-cluster

Flag	Description	Packages
cgi	Install CGI server and scripts.	4
fuse	Install the mfsmount utility.	4

Local USE flags

app-admin

logstash-bin

Flag	Description
x-pack

loki

Flag	Description
fluent-bit	Build the fluent-bit plugin to publish from <pkg>app-admin/fluent-bit</pkg>
promtail	Build the promtail log gathering agent
server	Build the loki server
tools	Build the loki tools logcli and loki-canary

app-misc

fslint

Flag	Description
nls

dev-db

omnipitr

Flag	Description
bzip2
gzip
lzma
xz

rethinkdb

Flag	Description
jemalloc
tcmalloc

dev-php

pecl-memcached

Flag	Description
igbinary	Enable support for the igbinary serializer
json	Enable support for json serialization
session

net-analyzer

ncrack

Flag	Description
ssh

suricata

Flag	Description
af-packet	Enable AF_PACKET support
af-xdp	Enable AF_XDP support
bpf	Enable support for eBPF (as well as XDP if supported by the kernel and the NIC driver) for low-level, high-speed packet processing
control-socket	Enable unix socket
cuda
detection	Enable detection modules
geoip
hardened
hyperscan	Enable high-performance regex matching with Hyperscan
ndpi
nflog	Enable libnetfilter_log support
nfqueue	Enable NFQUEUE support for inline IDP
pfring
redis	Enable Redis support

net-libs

libsrtp

Flag	Description
aesicm	Use AES ICM cryptographic algorithm
console	Use /dev/console instead of stdout for error messages
nss	Use NSS crypto primitives
openssl	Use OpenSSL crypto primitives

sofia-sip

Flag	Description
glib	Add support to <pkg>dev-libs/glib</pkg>-based mainloop, to allow using Sofia-SIP on glib-based programs.

net-mail

perdition

Flag	Description
berkdb
cdb
gdbm
ldap
mysql
odbc
postgres

net-misc

janus-gateway

Flag	Description
static

net-print

samsung-unified-driver

Flag	Description
cups
network	Enable network printing support
scanner

sys-cluster

lizardfs

Flag	Description
devel
fuse3	Use new FUSE library.

moosefs

Flag	Description
gui

virtual

lua

Flag	Description
bit

www-servers

nginx

Flag	Description
aio	Enables file AIO support
http	Enable HTTP core support
http-cache	Enable HTTP cache support
http2
http3
ipv6
ktls
libatomic	Use libatomic instead of builtin atomic operations
nginx_modules_
nginx_modules_http_
nginx_modules_http_addition
nginx_modules_http_dav
nginx_modules_http_rewrite
nginx_modules_http_spdy
nginx_modules_http_stub_status
nginx_modules_http_xslt
nginx_modules_mail_
nginx_modules_stream_
pcre
pcre-jit	Enable JIT for pcre
pcre2
rtmp
selinux
vim-syntax

x11-drivers

evdi

Flag	Description
python	Build PyEvdi

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