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USE flags

a52 - Enable support for decoding ATSC A/52 streams used in DVD
aac - Enable support for MPEG-4 AAC Audio
aalib - Add support for media-libs/aalib (ASCII-Graphics Library)
abi_mips_n32 - 64-bit (32-bit pointer) libraries
abi_mips_n64 - 64-bit libraries
abi_mips_o32 - 32-bit libraries
abi_ppc_32 - 32-bit (ppc) libraries
abi_ppc_64 - 64-bit (ppc64) libraries
abi_riscv_lp64 - 64-bit (rv64) soft-float libraries
abi_riscv_lp64d - 64-bit (rv64) double hard-float libraries
abi_s390_32 - 32-bit (s390) libraries
abi_s390_64 - 64-bit (s390x) libraries
abi_x86_32 - 32-bit (x86) libraries
abi_x86_64 - 64-bit (amd64) libraries
abi_x86_x32 - x32 ABI libraries
accessibility - Add support for accessibility (eg 'at-spi' library)
acl - Add support for Access Control Lists
acpi - Add support for Advanced Configuration and Power Interface
ada_target_gcc_12 - Compile with sys-devel/gcc:12
ada_target_gcc_13 - Compile with sys-devel/gcc:13
ada_target_gcc_14 - Compile with sys-devel/gcc:14
ada_target_gcc_15 - Compile with sys-devel/gcc:15
ada_target_gcc_16 - Compile with sys-devel/gcc:16
ada_target_gnat_2021 - Compile with dev-lang/gnat-gpl-2021
adns - Add support for asynchronous DNS resolution
afs - Add OpenAFS support (distributed file system)
alsa - Add support for media-libs/alsa-lib (Advanced Linux Sound Architecture)
alsa_cards_aica - Sega Dreamcast audio driver
alsa_cards_asihpi - AudioScience ASIxxxx
alsa_cards_ca0132 - Creative CA0132 (Sound Core3D) HD-audio
alsa_cards_cs46xx - Cirrus Logic (Sound Fusion) CS4280/CS461x/CS462x/CS463x
alsa_cards_darla20 - (Echoaudio) Darla20
alsa_cards_darla24 - (Echoaudio) Darla24
alsa_cards_echo3g - (Echoaudio) 3G cards
alsa_cards_emu10k1 - Emu10k1 (SB Live!, Audigy, E-mu APS)
alsa_cards_emu10k1x - Emu10k1X (Dell OEM Version)
alsa_cards_emu1212 - E-MU 1212M PCI
alsa_cards_emu1616 - E-MU 1616 CardBus, 1616m CardBus, 1616 PCI
alsa_cards_emu1820 - E-MU 1820M PCI
alsa_cards_gina20 - (Echoaudio) Gina20
alsa_cards_gina24 - (Echoaudio) Gina24
alsa_cards_hdsp - RME Hammerfall DSP Audio
alsa_cards_hdspm - RME Hammerfall DSP MADI
alsa_cards_ice1712 - ICEnsemble ICE1712 (Envy24)
alsa_cards_indigo - (Echoaudio) Indigo
alsa_cards_indigoio - (Echoaudio) Indigo IO
alsa_cards_korg1212 - Korg 1212 IO
alsa_cards_layla20 - (Echoaudio) Layla20
alsa_cards_layla24 - (Echoaudio) Layla24
alsa_cards_maestro3 - ESS Allegro/Maestro3
alsa_cards_mia - (Echoaudio) Mia
alsa_cards_mixart - Digigram miXart
alsa_cards_mona - (Echoaudio) Mona
alsa_cards_msnd-pinnacle - Turtle Beach MultiSound Pinnacle/Fiji driver
alsa_cards_pcxhr - Digigram PCXHR
alsa_cards_rme32 - RME Digi32, 32/8, 32 PRO
alsa_cards_rme96 - RME Digi96, 96/8, 96/8 PRO
alsa_cards_sb16 - Sound Blaster 16 (PnP)
alsa_cards_sbawe - Sound Blaster AWE (32,64) (PnP)
alsa_cards_sscape - Ensoniq SoundScape PnP driver
alsa_cards_usb-usx2y - Tascam US-122, US-224 and US-428 USB driver
alsa_cards_vx222 - Digigram VX222
alsa_cards_wavefront - Turtle Beach Maui,Tropez,Tropez+ (Wavefront)
alsa_cards_ymfpci - Yamaha YMF724/740/744/754
altivec - Add support for optimizations for G4 and G5/ppc970 processors
amdgpu_targets_gfx1010 - RDNA GPU, codename navi10, including Radeon RX 5700XT/5700/5700M/5700B/5700XTB/5600XT/5600/5600M, Radeon Pro 5700XT/5700, Radeon Pro W5700X/W5700
amdgpu_targets_gfx1011 - RDNA GPU, codename navi12, including Radeon Pro 5600M/V520
amdgpu_targets_gfx1012 - RDNA GPU, codename navi14, including Radeon RX 5500XT/5500/5500M/5500XTB/5300/5300M, Radeon Pro 5500XT/5500M/5300/5300M, Radeon Pro W5500X/W5500/W5500M/W5300M
amdgpu_targets_gfx1030 - RDNA2 GPU, codename navi21/sienna cichlid, including Radeon RX 6950XT/6900XT/6800XT/6800, Radeon Pro W6800/V620
amdgpu_targets_gfx1031 - RDNA2 GPU, codename navi22/navy flounder, including Radeon RX 6750XT/6700XT/6800M/6700M
amdgpu_targets_gfx1100 - RDNA3 GPU, codename navi31/plum bonito, including Radeon RX 7900 XTX/XT/GRE, AMD Radeon Pro W7900/W7800
amdgpu_targets_gfx1101 - RDNA3 GPU, codename navi32, including Radeon RX 7700XT/7800XT, AMD Radeon PRO W7700/V710
amdgpu_targets_gfx1102 - RDNA3 GPU, codename navi33, including Radeon RX 7400/7600/7600M/7600M XT/7700S/7600S, AMD Radeon PRO W7600/W7500
amdgpu_targets_gfx1103 - RDNA3 APU, codename navi3x, including Radeon 700M/780M
amdgpu_targets_gfx1150 - RDNA 3.5 APU (Strix Point), including Radeon 890M
amdgpu_targets_gfx1151 - RDNA 3.5 APU (Strix Halo), including Radeon 8060S
amdgpu_targets_gfx1152 - RDNA 3.5 APU (Krackan Point), including Radeon 860M/840M
amdgpu_targets_gfx1153 - RDNA 3.5 APU, including Radeon 820M
amdgpu_targets_gfx1200 - RDNA4 GPU, codename navi44, including Radeon RX 9060XT/9060XT LP
amdgpu_targets_gfx1201 - RDNA4 GPU, codename navi48, including Radeon RX 9070/9070XT/9070GRE and Radeon AI PRO R9600D/R9700
amdgpu_targets_gfx803 - Fiji GPU, codename fiji, including Radeon R9 Nano/Fury/FuryX, Radeon Pro Duo, FirePro S9300x2, Radeon Instinct MI8
amdgpu_targets_gfx900 - Vega GPU, codename vega10, including Radeon Vega Frontier Edition, Radeon RX Vega 56/64, Radeon RX Vega 64 Liquid, Radeon Pro Vega 48/56/64/64X, Radeon Pro WX 8200/9100, Radeon Pro V320/V340/SSG, Radeon Instinct MI25
amdgpu_targets_gfx906 - Vega GPU, codename vega20, including Radeon (Pro) VII, Radeon Instinct MI50/MI60
amdgpu_targets_gfx908 - CDNA Accelerator, codename arcturus, including AMD Instinct MI100 Accelerator
amdgpu_targets_gfx90a - CDNA2 Accelerator, codename aldebaran, including AMD Instinct MI200 series Accelerators
amdgpu_targets_gfx940 - CDNA3 Accelerator, codename aqua_vangaram, MI300A rev 0
amdgpu_targets_gfx941 - CDNA3 Accelerator, codename aqua_vangaram, MI300X rev 0
amdgpu_targets_gfx942 - CDNA3 Accelerator, codename aqua_vangaram, MI300A and MI300X rev >=1
amdgpu_targets_gfx950 - CDNA4 Accelerator, including AMD Instinct MI350X and MI355X
ao - Use libao audio output library for sound playback
apache2 - Add Apache2 support
apache2_modules_access_compat - Group authorizations based on host (name or IP address). Available as a compatibility module with previous versions
apache2_modules_actions - Provides for executing CGI scripts based on media type or request method
apache2_modules_alias - Provides for mapping different parts of the host filesystem in the document tree and for URL redirection
apache2_modules_allowmethods - This module makes it easy to restrict what HTTP methods can be used on a server
apache2_modules_asis - Sends files that contain their own HTTP headers
apache2_modules_auth_basic - Basic authentication
apache2_modules_auth_digest - User authentication using MD5 Digest Authentication
apache2_modules_auth_form - Allows the use of an HTML login form to restrict access by looking up users in the given providers
apache2_modules_authn_anon - Allows "anonymous" user access to authenticated areas
apache2_modules_authn_core - Provides core authentication capabilities common to all authentication providers (functionality provided by authn_alias in previous versions)
apache2_modules_authn_dbd - User authentication using an SQL database
apache2_modules_authn_dbm - User authentication using DBM files
apache2_modules_authn_file - User authentication using text files
apache2_modules_authn_socache - Maintains a cache of authentication credentials, so that a new backend lookup is not required for every authenticated request
apache2_modules_authz_core - Provides core authorization capabilities to various authorization/authorization modules, such as authn_file and authz_user
apache2_modules_authz_dbd - Provides authorization capabilities via SQL database so that authenticated users can be allowed or denied access to portions of the web site by group membership
apache2_modules_authz_dbm - Group authorization using DBM files
apache2_modules_authz_groupfile - Group authorization using plaintext files
apache2_modules_authz_host - Group authorizations based on host (name or IP address)
apache2_modules_authz_owner - Authorization based on file ownership
apache2_modules_authz_user - User Authorization
apache2_modules_autoindex - Generates directory indexes, automatically, similar to the Unix ls command
apache2_modules_brotli - Enable brotli compression support
apache2_modules_cache - Content cache keyed to URIs
apache2_modules_cache_disk - Disk based storage module for the HTTP caching filter (similar to mem_cache in previous versions)
apache2_modules_cache_socache - Shared object cache (socache) based storage module for the HTTP caching filter
apache2_modules_cern_meta - CERN httpd metafile semantics
apache2_modules_cgi - Enable CGI module (used by non-multithreaded MPMs, for eg. prefork)
apache2_modules_cgid - Enable CGI module (used by multithreaded MPMs, for eg. worker)
apache2_modules_charset_lite - Specify character set translation or recoding
apache2_modules_dav - Distributed Authoring and Versioning (WebDAV) functionality
apache2_modules_dav_fs - filesystem provider for mod_dav
apache2_modules_dav_lock - generic locking module for mod_dav
apache2_modules_dbd - Manages SQL database connections
apache2_modules_deflate - Compress content before it is delivered to the client
apache2_modules_dir - Provides for "trailing slash" redirects and serving directory index files
apache2_modules_dumpio - Dumps all I/O to error log as desired
apache2_modules_env - Modifies the environment which is passed to CGI scripts and SSI pages
apache2_modules_expires - Generation of Expires and Cache-Control HTTP headers according to user-specified criteria
apache2_modules_ext_filter - Pass the response body through an external program before delivery to the client
apache2_modules_file_cache - Caches a static list of files in memory
apache2_modules_filter - Context-sensitive smart filter configuration module
apache2_modules_headers - Customization of HTTP request and response headers
apache2_modules_http2 - Enable http2/alpn module
apache2_modules_ident - RFC 1413 ident lookups
apache2_modules_imagemap - Server-side imagemap processing
apache2_modules_include - Server-parsed html documents (Server Side Includes)
apache2_modules_info - Provides a comprehensive overview of the server configuration
apache2_modules_lbmethod_bybusyness - Pending Request Counting load balancer scheduler algorithm for mod_proxy_balancer
apache2_modules_lbmethod_byrequests - Request Counting load balancer scheduler algorithm for mod_proxy_balancer
apache2_modules_lbmethod_bytraffic - Weighted Traffic Counting load balancer scheduler algorithm for mod_proxy_balancer
apache2_modules_lbmethod_heartbeat - Heartbeat Traffic Counting load balancer scheduler algorithm for mod_proxy_balancer
apache2_modules_log_config - Logging of the requests made to the server
apache2_modules_log_forensic - Forensic Logging of the requests made to the server
apache2_modules_logio - Logging of input and output bytes per request
apache2_modules_lua - Provides Lua hooks into various portions of the httpd request processing
apache2_modules_macro - Macros for the Apache config file
apache2_modules_md - Managing domains across virtual hosts, certificate provisioning via the ACME protocol
apache2_modules_mime - Associates the requested filename's extensions with the file's behavior (handlers and filters) and content (mime-type, language, character set and encoding)
apache2_modules_mime_magic - Determines the MIME type of a file by looking at a few bytes of its contents
apache2_modules_negotiation - Provides for content negotiation
apache2_modules_proxy - HTTP/1.1 proxy/gateway server
apache2_modules_proxy_ajp - AJP support module for mod_proxy
apache2_modules_proxy_balancer - mod_proxy extension for load balancing
apache2_modules_proxy_connect - mod_proxy extension for CONNECT request handling
apache2_modules_proxy_fcgi - FastCGI support module for mod_proxy
apache2_modules_proxy_ftp - FTP support module for mod_proxy
apache2_modules_proxy_hcheck - Dynamic health check of Balancer members (workers) for mod_proxy
apache2_modules_proxy_html - Module to rewrite links in html pages behind a reverse proxy
apache2_modules_proxy_http - HTTP support module for mod_proxy
apache2_modules_proxy_http2 - HTTP2 support module for mod_proxy
apache2_modules_proxy_scgi - SCGI gateway module for mod_proxy
apache2_modules_proxy_uwsgi - UWSGI gateway module for mod_proxy
apache2_modules_proxy_wstunnel - Provides support for the tunnelling of web socket connections to a backend websockets server
apache2_modules_ratelimit - Bandwidth Rate Limiting for Clients
apache2_modules_remoteip - Replaces the original client IP address for the connection with the useragent IP address list presented by a proxies or a load balancer via the request headers
apache2_modules_reqtimeout - Set timeout and minimum data rate for receiving requests
apache2_modules_request - Filters to handle and make available HTTP request bodies
apache2_modules_rewrite - Provides a rule-based rewriting engine to rewrite requested URLs on the fly
apache2_modules_session - Provides support for a server wide per user session interface
apache2_modules_session_cookie - Provides support for the storage of user sessions on the remote browser within HTTP cookies
apache2_modules_session_crypto - Provides support for the encryption of user sessions before being written to a local database, or written to a remote browser via an HTTP cookie
apache2_modules_session_dbd - Provides support for the storage of user sessions within a SQL database using the mod_dbd module
apache2_modules_setenvif - Allows the setting of environment variables based on characteristics of the request
apache2_modules_slotmem_shm - Slot-based shared memory provider
apache2_modules_socache_memcache - A shared object cache provider using memcached
apache2_modules_socache_shmcb - A shared object cache provider using a high-performance cyclic buffer inside a shared memory segment
apache2_modules_speling - Attempts to correct mistaken URLs that users might have entered by ignoring capitalization and by allowing up to one misspelling
apache2_modules_status - Provides information on server activity and performance
apache2_modules_substitute - Perform search and replace operations on response bodies
apache2_modules_tls - mod_tls TLS module for Apache, intended to replace mod_ssl
apache2_modules_unique_id - Provides an environment variable with a unique identifier for each request
apache2_modules_unixd - Basic (required) security for Unix-family platforms
apache2_modules_userdir - User-specific directories
apache2_modules_usertrack - Clickstream logging of user activity on a site
apache2_modules_version - Version dependent configuration
apache2_modules_vhost_alias - Provides for dynamically configured mass virtual hosting
apache2_modules_watchdog - Provides infrastructure for other modules to periodically run tasks
apache2_modules_xml2enc - Enable xml2 encoding module
apache2_mpms_event - An experimental variant of the standard worker MPM
apache2_mpms_prefork - Implements a non-threaded, pre-forking web server
apache2_mpms_worker - Multi-Processing Module implementing a hybrid multi-threaded multi-process web server
apparmor - Enable support for the AppArmor application security system
appindicator - Build in support for notifications using the libindicate or libappindicator plugin
aqua - Include support for the Mac OS X Aqua (Carbon/Cocoa) GUI
asm - Enable using assembly for optimization
atm - Enable Asynchronous Transfer Mode protocol support
audiofile - Add support for libaudiofile where applicable
audit - Enable support for Linux audit subsystem using sys-process/audit
avif - Add AV1 Image Format (AVIF) support
bash-completion - Enable bash-completion support
berkdb - Add support for sys-libs/db (Berkeley DB)
bidi - Enable bidirectional language support
big-endian - Big-endian toolchain support
bindist - Flag to enable or disable options for prebuilt (GRP) packages (eg. due to licensing issues)
blas - Add support for the virtual/blas numerical library
bluetooth - Enable Bluetooth Support
branding - Enable Gentoo specific branding
brotli - Enable Brotli compression support
build - !!internal use only!! DO NOT SET THIS FLAG YOURSELF!, used for creating build images and the first half of bootstrapping [make stage1]
bzip2 - Enable bzip2 compression support
cairo - Enable support for the cairo graphics library
calendar - Add support for calendars (not using mcal!)
calligra_features_karbon - CALLIGRA_FEATURES option to build vector image editor
calligra_features_sheets - CALLIGRA_FEATURES option to build spreadsheet processor
calligra_features_stage - CALLIGRA_FEATURES option to build presentation processor
calligra_features_words - CALLIGRA_FEATURES option to build word processor
cameras_adc65 - libgphoto support for adc65 cameras
cameras_agfa_cl20 - libgphoto support for agfa_cl20 cameras
cameras_aox - libgphoto support for aox cameras
cameras_ax203 - libgphoto support for ax203 cameras
cameras_barbie - libgphoto support for barbie cameras
cameras_canon - libgphoto support for canon cameras
cameras_casio_qv - libgphoto support for casio_qv cameras
cameras_clicksmart310 - libgphoto support for clicksmart310 cameras
cameras_digigr8 - libgphoto support for digigr8 cameras
cameras_digita - libgphoto support for digita cameras
cameras_dimagev - libgphoto support for dimagev cameras
cameras_dimera3500 - libgphoto support for dimera3500 cameras
cameras_directory - libgphoto support for directory cameras
cameras_enigma13 - libgphoto support for enigma13 cameras
cameras_fuji - libgphoto support for fuji cameras
cameras_gsmart300 - libgphoto support for gsmart300 cameras
cameras_hp215 - libgphoto support for hp215 cameras
cameras_iclick - libgphoto support for iclick cameras
cameras_jamcam - libgphoto support for jamcam cameras
cameras_jd11 - libgphoto support for jd11 cameras
cameras_jl2005a - libgphoto support for "American Idol Keychain Camera"
cameras_jl2005c - libgphoto support for "American Idol Keychain Camera"
cameras_kodak_dc120 - libgphoto support for kodak_dc120 cameras
cameras_kodak_dc210 - libgphoto support for kodak_dc210 cameras
cameras_kodak_dc240 - libgphoto support for kodak_dc240 cameras
cameras_kodak_dc3200 - libgphoto support for kodak_dc3200 cameras
cameras_kodak_ez200 - libgphoto support for kodak_ez200 cameras
cameras_konica - libgphoto support for konica cameras
cameras_konica_qm150 - libgphoto support for konica_qm150 cameras
cameras_largan - libgphoto support for largan cameras
cameras_lg_gsm - libgphoto support for lg_gsm cameras
cameras_mars - libgphoto support for mars cameras
cameras_mustek - libgphoto support for mustek cameras
cameras_panasonic_coolshot - libgphoto support for panasonic_coolshot cameras
cameras_panasonic_dc1000 - libgphoto support for panasonic_dc1000 cameras
cameras_panasonic_dc1580 - libgphoto support for panasonic_dc1580 cameras
cameras_panasonic_l859 - libgphoto support for panasonic_l859 cameras
cameras_pccam300 - libgphoto support for pccam300 cameras
cameras_pccam600 - libgphoto support for pccam600 cameras
cameras_pentax - libgphoto support for pentax cameras
cameras_polaroid_pdc320 - libgphoto support for polaroid_pdc320 cameras
cameras_polaroid_pdc640 - libgphoto support for polaroid_pdc640 cameras
cameras_polaroid_pdc700 - libgphoto support for polaroid_pdc700 cameras
cameras_ptp2 - libgphoto support for ptp2 cameras
cameras_ricoh - libgphoto support for ricoh cameras
cameras_ricoh_g3 - libgphoto support for ricoh_g3 cameras
cameras_samsung - libgphoto support for samsung cameras
cameras_sierra - libgphoto support for sierra cameras
cameras_sipix_blink2 - libgphoto support for sipix_blink2 cameras
cameras_sipix_web2 - libgphoto support for sipix_web2 cameras
cameras_smal - libgphoto support for smal cameras
cameras_sonix - libgphoto support for sonix cameras
cameras_sony_dscf1 - libgphoto support for sony_dscf1 cameras
cameras_sony_dscf55 - libgphoto support for sony_dscf55 cameras
cameras_soundvision - libgphoto support for soundvision cameras
cameras_spca50x - libgphoto support for spca50x cameras
cameras_sq905 - libgphoto support for sq905 cameras
cameras_st2205 - libgphoto support for st2205 cameras
cameras_stv0674 - libgphoto support for stv0674 cameras
cameras_stv0680 - libgphoto support for stv0680 cameras
cameras_sx330z - libgphoto support for sx330z cameras
cameras_topfield - libgphoto support for Topfield PVR5000 cameras
cameras_toshiba_pdrm11 - libgphoto support for toshiba_pdrm11 cameras
cameras_tp6801 - libgphoto support for Tenx tp6801 cameras
caps - Use Linux capabilities library to control privilege
cdb - Add support for the CDB database engine from the author of qmail
cdda - Add Compact Disk Digital Audio (Standard Audio CD) support
cddb - Access cddb servers to retrieve and submit information about compact disks
cdinstall - Copy files from the CD rather than asking the user to copy them, mostly used with games
cdparanoia - Enable cdparanoia (audio CD ripper) support
cdr - Add support for CD writer hardware
cgi - Add CGI script support
cjk - Add support for Multi-byte character languages (Chinese, Japanese, Korean)
clamav - Add support for Clam AntiVirus software (usually with a plugin)
collectd_plugins_aggregation - Build the aggregation plugin (aggregates multiplte values into a single value)
collectd_plugins_amqp - Build the AMQP output plugin (transmits or receives values collected by collectd via the Advanced Message Queuing Protocol (AMQP))
collectd_plugins_apache - Build the apache input plugin (collects statistics from Apache's mod_status module)
collectd_plugins_apcups - Build the apcups input plugin (reads various statistics about a connected uninterruptible power supply (UPS))
collectd_plugins_ascent - Build the ascent input plugin (reads and parses the statistics page of Ascent)
collectd_plugins_battery - Build the battery input plugin (collects the battery's charge, the drawn current and the battery's voltage)
collectd_plugins_bind - Build the bind input plugin (collects statistics from bind instances)
collectd_plugins_buddyinfo - Build the buddyinfo input plugin (collects statistics from /proc/buddyinfo)
collectd_plugins_capabilities - Build the capabilities input plugin (collects platform capabilities decoded from the hardware subsystems)
collectd_plugins_ceph - Build the Ceph input plugin (collects statistics from the Ceph distributed storage system)
collectd_plugins_cgroups - Build the cgroups input plugin (collects CPU accounting information for processes in a cgroup)
collectd_plugins_check_uptime - Build a plugin to notify about uptime reset
collectd_plugins_chrony - Build the chrony input plugin (collects statistics from a chrony NTP server)
collectd_plugins_connectivity - Build the connectivity input plugin (monitors interface up/down status via netlink library)
collectd_plugins_conntrack - Build the conntrack input plugin (tracks the number of entries in Linux's connection tracking table)
collectd_plugins_contextswitch - Build the contextswitch input plugin (collects the number of context switches done by the operating system)
collectd_plugins_cpu - Build the cpu input plugin (collects the amount of time spent by the CPU in various states)
collectd_plugins_cpufreq - Build the cpufreq input plugin (collects the current CPU's frequency)
collectd_plugins_cpusleep - Build the cpusleep input plugin (measures time spent by CPU in deep sleep mode)
collectd_plugins_csv - Build the csv output plugin (writes to comma separated values (CSV) files)
collectd_plugins_curl - Build the curl input plugin (reads streams using net-misc/curl and then parses them according to the configuration)
collectd_plugins_curl_json - Build the curl_json input plugin (queries JavaScript Object Notation (JSON) data using net-misc/curl and parses it according to the user's configuration using dev-libs/yajl)
collectd_plugins_curl_xml - Build the curl_xml input plugin (reads files using net-misc/curl and parses it as Extensible Markup Language (XML))
collectd_plugins_dbi - Build the dbi input plugin (executes SQL statements on databases and reads back the result)
collectd_plugins_df - Build the df input plugin (collects file system usage information, i. e. basically how much space on a mounted partition is used and how much is available)
collectd_plugins_disk - Build the disk input plugin (collects performance statistics of disks and, where supported, partitions)
collectd_plugins_dns - Build the dns input plugin (collects statistics of your DNS traffic on port udp/53 using net-libs/libpcap)
collectd_plugins_drbd - Build the Linux's Distributed Replicated Block Device (DRBD) input plugin (reads Linux's DRBD statistics)
collectd_plugins_email - Build the email input plugin (opens a UNIX domain socket and starts accepting connections on that socket)
collectd_plugins_entropy - Build the entropy input plugin (collects the available entropy on a system)
collectd_plugins_ethstat - Build the ethstat input plugin (reads performance statistics directly from ethernet cards)
collectd_plugins_exec - Build the exec input/output plugin (executes scripts / applications and reads values back)
collectd_plugins_fhcount - Build the file handles input plugin (reports the number of used file handles)
collectd_plugins_filecount - Build the filecount input plugin (counts the number of files in a directory and all its subdirectories)
collectd_plugins_fscache - Build the fscache input plugin (collects information about the file-system based caching infrastructure for network file-systems and other slow media)
collectd_plugins_gps - Build the gps input plugin (collects number of satellites seen by a GPS receiver using sci-geosciences/gpsd)
collectd_plugins_gpu_nvidia - Build the NVIDIA GPU input plugin (collects stats from NVIDIA GPU)
collectd_plugins_hddtemp - Build the hddtemp input plugin (collects the temperature of disks from hddtemp daemon)
collectd_plugins_hugepages - Build the hugepages input plugin (collects the number of used and free hugepages on Linux)
collectd_plugins_interface - Build the interface input plugin (collects information about the traffic, packets per second and errors of interfaces)
collectd_plugins_ipc - Build the IPC input plugin (collects information related to shared memory)
collectd_plugins_ipmi - Build the ipmi input plugin (reads hardware sensors from servers using the Intelligent Platform Management Interface (IPMI))
collectd_plugins_iptables - Build the iptables input plugin (collects statistics from a ip_tables based packet filter)
collectd_plugins_ipvs - Build the IPVS input plugin (collects statistics from Linux IP Virtual Server)
collectd_plugins_irq - Build the irq input plugin (collects the number of times each interrupt has been handled by the operating system)
collectd_plugins_java - Build the java input plugin (embeds a JVM into collectd for writing plugins)
collectd_plugins_load - Build the load input plugin (collects the system load)
collectd_plugins_logfile - Build the logfile output plugin (receives log messages from collectd and writes them to a text file)
collectd_plugins_log_logstash - Build the Logstash output plugin (writes collectd logs and events as Logstash JSON formatted events)
collectd_plugins_logparser - Build the logparser plugin (allows for filtering and parsing log messages)
collectd_plugins_lua - Build the LUA language binding plugin (uses dev-lang/lua) for writing plugins
collectd_plugins_madwifi - Build the madwifi input plugin (collects information about Atheros wireless LAN chipsets from the MadWifi driver)
collectd_plugins_match_empty_counter - Build the match_empty_counter filter plugin
collectd_plugins_match_hashed - Build the match_hashed filter plugin
collectd_plugins_match_regex - Build the match_regex filter plugin
collectd_plugins_match_timediff - Build the match_timediff filter plugin
collectd_plugins_match_value - Build the match_value filter plugin
collectd_plugins_mbmon - Build the mbmon input plugin (collects information from mainboard sensors)
collectd_plugins_mcelog - Build the mcelog input plugin (subscribes to Machine Check Exceptions (MCE) and dispatches notifications)
collectd_plugins_md - Build the md input plugin (reports the number of disks in various states in Linux software RAID devices)
collectd_plugins_memcachec - Build the memcachec input plugin (queries one or more given pages from a memcached instance and parses the returned data according to user specification)
collectd_plugins_memcached - Build the memcached input plugin (collects statistics from memcached daemon)
collectd_plugins_memory - Build the memory input plugin (collects physical memory utilization)
collectd_plugins_modbus - Build the Modbus input plugin (reads register values from a Modbus "slave" via Modbus/TCP)
collectd_plugins_mqtt - Build the MQTT plugin (sends metrics to and/or receives metrics from an MQTT broker using app-misc/mosquitto)
collectd_plugins_multimeter - Build the multimeter input plugin (reads a voltage or current from a multimeter connected to a serial bus)
collectd_plugins_mysql - Build the mysql input plugin (collects values from 'SHOW STATUS' command of a MySQL server)
collectd_plugins_netlink - Build the netlink input plugin (collects statistics for interfaces, qdiscs, classes and filters using netlink socket)
collectd_plugins_network - Build the network input/output plugin (send values to other and/or receive values from from other collectd instances)
collectd_plugins_nfs - Build the nfs input plugin (collects information about the usage of the Network File System (NFS))
collectd_plugins_nginx - Build the nginx input plugin (collects number of requests handled and the number of current connections by connection state by the nginx daemon)
collectd_plugins_notify_desktop - Build the notify_desktop output plugin (uses x11-libs/libnotify to display notifications to the user)
collectd_plugins_notify_email - Build the notify_email output plugin (uses net-libs/libesmtp to send notifications to a configured email address)
collectd_plugins_notify_nagios - Build the notify_nagios output plugin (sends notifications to Nagios as a passive check result)
collectd_plugins_ntpd - Build the ntpd input plugin (collects statistics from a NTP server)
collectd_plugins_numa - Build the numa input plugin (collects statistics of the Linux Non-Uniform Memory Access (NUMA) subsystem)
collectd_plugins_nut - Build the nut input plugin (collects UPS statistics using the Network UPS Tools)
collectd_plugins_olsrd - Build the olsrd input plugin (reads information about the Optimized Link State Routing daemon)
collectd_plugins_onewire - Build the onewire (1-Wire) input plugin (collects temperature information from sensors)
collectd_plugins_openldap - Build the OpenLDAP input plugin (reads monitoring information from OpenLDAP's cn=Monitor subtree)
collectd_plugins_openvpn - Build the openvpn input plugin (reads the status file printed by OpenVPN)
collectd_plugins_oracle - Build the oracle input plugin (executes SQL statements against Oracle database systems)
collectd_plugins_ovs_events - Build an input plugin which reports link state changes from Open vSwitch (OVS)
collectd_plugins_ovs_stats - Build an input plugin which reports bridge and interface statistics from Open vSwitch (OVS)
collectd_plugins_pcie_errors - Build an input plugin which reports the PCIe errors
collectd_plugins_perl - Build the perl language binding plugin (embeds a Perl interpreter into collectd for writing plugins)
collectd_plugins_ping - Build the ping input plugin (measures network latency)
collectd_plugins_postgresql - Build the postgresql input plugin (executes SQL statements against a PostgreSQL database)
collectd_plugins_powerdns - Build the powerdns input plugin (collects statistics from the PowerDNS name server or recursor via control socket)
collectd_plugins_processes - Build the processes input plugin (collects the number of processes, grouped by their state or detailed statistics about selected processes)
collectd_plugins_procevent - Build the procevent input plugin (monitors process starts/stops via netlink library)
collectd_plugins_protocols - Build the protocols input plugin (collects information about the network protocols supported by the system)
collectd_plugins_python - Build the python language binding plugin (embeds a Python interpreter into collectd for writing plugins)
collectd_plugins_redis - Build the Redis input plugin (collects usage information from Redis instances)
collectd_plugins_routeros - Build the routeros input plugin (collects information from devices running RouterOS)
collectd_plugins_rrdcached - Build the rrdcached input/output plugin (connects to rrdcached and submits updates for RRD files)
collectd_plugins_rrdtool - Build the rrdtool output plugin (writes values to RRD-files)
collectd_plugins_sensors - Build the sensors input plugin (reads hardware sensors from lm-sensors)
collectd_plugins_serial - Build the serial input plugin (collects the traffic on serial interfaces)
collectd_plugins_sigrok - Build the sigrok input plugin (reads measurements from any supported hardware from sigrok project)
collectd_plugins_slurm - Build the slurm input plugin (collects metrics from the SLURM workload manager)
collectd_plugins_smart - Build the S.M.A.R.T input plugin (collects S.M.A.R.T statistics from disk drives)
collectd_plugins_snmp - Build the snmp input plugin (reads values from network devices using SNMP)
collectd_plugins_snmp_agent - Build an input plugin which implements an SNMP AgentX subagent that receives and handles queries from SNMP master agent and returns configured metrics
collectd_plugins_statsd - Build the statsd input plugin (accepts statsd-type metrics from a UDP socket)
collectd_plugins_swap - Build the swap input plugin (collects amount of memory currently written to swap)
collectd_plugins_synproxy - Build the Linux SYNPROXY input plugin (collects metrics from /proc/net/stat/synproxy)
collectd_plugins_sysevent - Build the rsyslog input plugin (collects system events from rsyslog)
collectd_plugins_syslog - Build the syslog output plugin (receives messages from collectd and dispatches them to syslog)
collectd_plugins_table - Build the table input plugin (parses table-like structured plain text)
collectd_plugins_tail - Build the tail input plugin (follows logfiles, e.g. tail -f)
collectd_plugins_tail_csv - Build the tail_csv input plugin (follows and parses CSV files, e.g. tail -f *.csv)
collectd_plugins_target_notification - Build the target_notification filter plugin
collectd_plugins_target_replace - Build the target_replace filter plugin
collectd_plugins_target_scale - Build the target_scale filter plugin
collectd_plugins_target_set - Build the target_set filter plugin
collectd_plugins_tcpconns - Build the tcpconns input plugin (collects numbers of TCP connections to or from a specified port)
collectd_plugins_teamspeak2 - Build the teamspeak2 input plugin (collects traffic statistics from a teamspeak2 instance)
collectd_plugins_ted - Build the ted input plugin (connects to The Energy Detective and reads the current power over connected power lines)
collectd_plugins_thermal - Build the thermal input plugin (reads ACPI thermal zone information)
collectd_plugins_threshold - Build the threshold plugin (checks values against configured thresholds and creates notifications if values are out of bounds)
collectd_plugins_turbostat - Build the turbostat input plugin (reads CPU frequency and C-state residency on modern Intel turbo-capable processors)
collectd_plugins_ubi - Build the ubi input plugin (collects block state for flash memory devices with UBIFS)
collectd_plugins_unixsock - Build the unixsock input/output plugin (opens a UNIX domain socket and accepts connections)
collectd_plugins_uptime - Build the uptime input plugin (keeps track of the system uptime)
collectd_plugins_users - Build the users input plugin (counts the number of users currently logged into the system)
collectd_plugins_uuid - Build the uuid plugin (tries hard to determine the UUID of the system it is running on)
collectd_plugins_varnish - Build the varnish input plugin (collects information about Varnish)
collectd_plugins_virt - Build the (lib)virt input plugin (collects statistics about virtualized guests on a system)
collectd_plugins_vmem - Build the vmem input plugin (collects information about the virtual memory subsystem of the kernel)
collectd_plugins_vserver - Build the vserver input plugin (collects information about the virtual servers running on a system, using Linux-Vserver)
collectd_plugins_wireless - Build the wireless input plugin (collects signal quality, signal power and signal-to-noise ratio for wireless LAN cards)
collectd_plugins_write_graphite - Build the write_graphite output plugin (stores values in Carbon, the storage layer of Graphite)
collectd_plugins_write_http - Build the write_http output plugin (sends metrics to a web-server using HTTP POST requests)
collectd_plugins_write_influxdb_udp - Build the InfluxDB UDP output plugin (sends metrics to InfluxDB using UDP)
collectd_plugins_write_kafka - Build the Kafka output plugin (sends metrics to Apache Kafka)
collectd_plugins_write_log - Build the write_log output plugin (writes metrics to a file)
collectd_plugins_write_mongodb - Build the MongoDB output plugin (stores values in MongoDB)
collectd_plugins_write_prometheus - Builds the Prometheus output plugin (starts an internal webserver on port 9103 (configurable) and accepts scrape requests from Prometheus)
collectd_plugins_write_redis - Build the Redis output plugin (stores values in Redis)
collectd_plugins_write_sensu - Build the Sensu output plugin (sends metrics to Sensu Core, an open-source monitoring project)
collectd_plugins_write_stackdriver - Build the Stackdriver output plugin (stores metrics in Google Stackdriver)
collectd_plugins_write_syslog - Build the Syslog output plugin (sends metrics in CEE-enhanced syslog message format)
collectd_plugins_write_tsdb - Build the TSDB output plugin (writes metrics to OpenTSDB, an open-source distributed time-series database based on Apache HBase)
collectd_plugins_xencpu - Build the XEN CPU input plugin (collects XEN Hypervisor CPU stats using app-emulation/xen-tools)
collectd_plugins_zfs_arc - Build the ZFS ARC input plugin (reports information such as the cache size, the various hits and misses (also as a ratio) and the transferred data)
collectd_plugins_zookeeper - Build the zookeeper input plugin (reads data from Apache Zookeeper MNTR command)
colord - Support color management using x11-misc/colord
connman - Add support for net-misc/connman
coreaudio - Build the CoreAudio driver on Mac OS X systems
cpu_flags_arm_aes - Use the AES cryptography instruction set
cpu_flags_arm_asimd - Use the Advanced SIMD instructions (NEON with ARMv8 extensions)
cpu_flags_arm_asimddp - Use the Advanced SIMD dot product instructions
cpu_flags_arm_asimdfhm - Use the Advanced SIMD single- & half-precision multiply
cpu_flags_arm_asimdhp - Use the Advanced SIMD half-precision & vector arithmetics
cpu_flags_arm_crc32 - Use the CRC32 instruction set
cpu_flags_arm_edsp - Use the enhanced DSP instructions (ARMv*E and ARMv6+)
cpu_flags_arm_i8mm - Use the AArch64 Int8 matrix multiplication instructions
cpu_flags_arm_iwmmxt - Use the iwMMXt instruction set
cpu_flags_arm_iwmmxt2 - Use the iwMMXt2 instruction set
cpu_flags_arm_neon - Use the NEON instruction set
cpu_flags_arm_neon-fp16 - Use the NEON intruction set with half word loads / store support
cpu_flags_arm_sha1 - Use the SHA-1 cryptography instruction set
cpu_flags_arm_sha2 - Use the SHA-2 cryptography instruction set
cpu_flags_arm_sm4 - Use the SM4 cryptography instruction set
cpu_flags_arm_sve - Use the Scalable Vector Extension instruction set
cpu_flags_arm_sve2 - Use the Scalable Vector Extension 2 instruction set
cpu_flags_arm_thumb - Enable Thumb instruction set (ARMv*T and ARMv6+)
cpu_flags_arm_thumb2 - Enable Thumb-2 instruction set (ARMv*T2 and ARMv7+)
cpu_flags_arm_v4 - Use instructions added in ARMv4
cpu_flags_arm_v5 - Use instructions added in ARMv5
cpu_flags_arm_v6 - Use instructions added in ARMv6
cpu_flags_arm_v7 - Use instructions added in ARMv7
cpu_flags_arm_v8 - Use instructions added in ARMv8
cpu_flags_arm_vfp - Use the VFP version 2 instruction set
cpu_flags_arm_vfp-d32 - Indicate that the FPU has 32 64-bit VFP (v3+) registers (16 otherwise)
cpu_flags_arm_vfpv3 - Use the VFP version 3 instruction set
cpu_flags_arm_vfpv4 - Use the VFP version 4 instruction set
cpu_flags_ppc_altivec - Use the AltiVec/VMX instruction set
cpu_flags_ppc_vsx - Use the Vector Scalar Extension instruction set (POWER7 and later)
cpu_flags_ppc_vsx2 - Use the Vector Scalar Extension v.2 instruction set (POWER8 and later)
cpu_flags_ppc_vsx3 - Use the Vector Scalar Extension v.3 instruction set (POWER9 and later)
cpu_flags_ppc_vsx4 - Use the Vector Scalar Extension v.4 instruction set (POWER10 and later)
cpu_flags_x86_3dnow - Use the 3DNow! instruction set
cpu_flags_x86_3dnowext - Use the Enhanced 3DNow! instruction set
cpu_flags_x86_aes - Enable support for Intel's AES instruction set (AES-NI)
cpu_flags_x86_amx_bf16 - Use Advanced Matrix Extensions tile computational operations on bfloat16 numbers
cpu_flags_x86_amx_int8 - Use Advanced Matrix Extensions tile computational operations on 8-bit integers
cpu_flags_x86_amx_tile - Use Advanced Matrix Extensions tile architecture support
cpu_flags_x86_avx - Adds support for Advanced Vector Extensions instructions
cpu_flags_x86_avx2 - Adds support for Advanced Vector Extensions 2 instructions
cpu_flags_x86_avx512_4fmaps - Use AVX-512 Fused Multiply-Accumulate Packed Single Precision instruction set
cpu_flags_x86_avx512_4vnniw - Use AVX-512 Vector Neural Network Instructions Word Variable Precision
cpu_flags_x86_avx512_bf16 - Use AVX-512 BFloat16 instruction set
cpu_flags_x86_avx512_bitalg - Use AVX-512 Bit Algorithms instruction set
cpu_flags_x86_avx512bw - Use AVX-512 byte- and word instructions
cpu_flags_x86_avx512cd - Use AVX-512 conflict detection instructions
cpu_flags_x86_avx512dq - Use AVX-512 double- and quad-word instructions
cpu_flags_x86_avx512er - Use AVX-512 exponential and reciprocal instructions
cpu_flags_x86_avx512f - Adds support for AVX-512 Foundation instructions
cpu_flags_x86_avx512_fp16 - Use general-purpose numeric operations for 16-bit half-precision instruction set
cpu_flags_x86_avx512ifma - Use AVX-512 Integer Fused Multiply-Add instruction set
cpu_flags_x86_avx512pf - Use AVX-512 prefetch instructions
cpu_flags_x86_avx512vbmi - Use AVX-512 vector byte manipulation instructions
cpu_flags_x86_avx512_vbmi2 - Use AVX-512 Vector Bit Manipulation Instructions 2
cpu_flags_x86_avx512vl - Use AVX-512 vector-length instructions
cpu_flags_x86_avx512_vnni - Use vector neural network instructions for 8- and 16-bit multiply-add operations
cpu_flags_x86_avx512_vp2intersect - Use AVX-512 Intersect instruction set
cpu_flags_x86_avx512_vpopcntdq - Use AVX-512 Vector Population Count Doubleword and Quadword instruction set
cpu_flags_x86_avx_vnni - Use AVX (VEX-encoded) versions of the Vector Neural Network Instructions
cpu_flags_x86_bmi1 - Enable the first group of advanced bit manipulation extensions (ANDN, BEXTR, BLSI, BLSMSK, BLSR, TZCNT)
cpu_flags_x86_bmi2 - Enable the second group of advanced bit manipulation extensions (BZHI, MULX, PDEP, PEXT, RORX, SARX, SHLX, SHRX)
cpu_flags_x86_f16c - Adds support for F16C instruction set for converting between half-precision and single-precision floats
cpu_flags_x86_fma3 - Use the Fused Multiply Add 3 instruction set ([fma] in cpuinfo)
cpu_flags_x86_fma4 - Use the Fused Multiply Add 4 instruction set
cpu_flags_x86_mmx - Use the MMX instruction set
cpu_flags_x86_mmxext - Use the Extended MMX instruction set (a subset of SSE) ([mmxext] or [sse] in cpuinfo)
cpu_flags_x86_padlock - Use VIA padlock instructions ([phe] in cpuinfo)
cpu_flags_x86_pclmul - Use Carry-less Multiplication instructions ([pclmulqdq] in cpuinfo)
cpu_flags_x86_popcnt - Enable popcnt instruction support ([abm] or [popcnt] in cpuinfo)
cpu_flags_x86_rdrand - Use the RDRAND instruction for generating random numbers
cpu_flags_x86_sha - Use the SHA-NI instruction set
cpu_flags_x86_sse - Use the SSE instruction set
cpu_flags_x86_sse2 - Use the SSE2 instruction set
cpu_flags_x86_sse3 - Use the SSE3 instruction set ([pni] in cpuinfo, NOT ssse3)
cpu_flags_x86_sse4_1 - Enable SSE4.1 instruction support
cpu_flags_x86_sse4_2 - Enable SSE4.2 instruction support
cpu_flags_x86_sse4a - Enable SSE4a instruction support
cpu_flags_x86_ssse3 - Use the SSSE3 instruction set (NOT sse3/pni)
cpu_flags_x86_vpclmulqdq - Use Vector Carry-Less Multiplication of Quadwords instruction set
cpu_flags_x86_xop - Enable the XOP instruction set
cracklib - Support for cracklib strong password checking
crosscompile_opts_headers-only - Build the toolchain against cross-headers only.
crypt - Add support for encryption -- using mcrypt or gpg where applicable
css - Enable reading of encrypted DVDs
cuda - Enable NVIDIA CUDA support (computation on GPU)
cups - Add support for CUPS (Common Unix Printing System)
curl - Add support for client-side URL transfer library
curl_quic_ngtcp2 - Use ngtcp2
curl_quic_openssl - Use OpenSSL
curl_ssl_gnutls - Use GnuTLS
curl_ssl_mbedtls - Use mbed TLS
curl_ssl_nss - Use Mozilla's Network Security Services
curl_ssl_openssl - Use OpenSSL
curl_ssl_rustls - Use Rustls
custom-cflags - Build with user-specified CFLAGS (unsupported)
cvs - Enable CVS (Concurrent Versions System) integration
cxx - Build support for C++ (bindings, extra libraries, code generation, ...)
dbi - Enable dev-db/libdbi (database-independent abstraction layer) support
dbm - Add support for generic DBM databases
dbus - Enable dbus support for anything that needs it (gpsd, gnomemeeting, etc)
debug - Enable extra debug codepaths, like asserts and extra output. If you want to get meaningful backtraces see https://wiki.gentoo.org/wiki/Project:Quality_Assurance/Backtraces
dedicated - Add support for dedicated game servers (some packages do not provide clients and servers at the same time)
dga - Add DGA (Direct Graphic Access) support for X
dist-kernel - Enable subslot rebuilds on Distribution Kernel upgrades
djvu - Support DjVu, a PDF-like document format esp. suited for scanned documents
doc - Add extra documentation (API, Javadoc, etc). It is recommended to enable per package instead of globally
dri - Enable direct rendering: used for accelerated 3D and some 2D, like DMA
dts - Enable DTS Coherent Acoustics decoder support
dv - Enable support for a codec used by many camcorders
dvb - Add support for DVB (Digital Video Broadcasting)
dvd - Add support for DVDs
dvdr - Add support for DVD writer hardware (e.g. in xcdroast)
eds - Enable support for Evolution-Data-Server (EDS)
egl - Enable EGL (Embedded-System Graphics Library, interfacing between windowing system and OpenGL/GLES) support
elibc_bionic - ELIBC setting for systems that use Android's Bionic C library
elibc_Cygwin - ELIBC setting for systems that use Cygwin
elibc_Darwin - ELIBC setting for systems that use the Darwin C library
elibc_FreeBSD - ELIBC setting for systems that use the FreeBSD C library
elibc_glibc - ELIBC setting for systems that use the GNU C library
elibc_mingw - ELIBC setting for systems that use the Minimalist GNU for Windows library
elibc_musl - ELIBC setting for systems that use the musl C library
elibc_SunOS - ELIBC setting for systems that use the Sun Solaris C library
elogind - Enable session tracking via sys-auth/elogind
emacs - Add support for GNU Emacs
emboss - Add support for the European Molecular Biology Open Software Suite
encode - Add support for encoding of audio or video files
examples - Install examples, usually source code
exif - Add support for reading EXIF headers from JPEG and TIFF images
expat - Enable the use of dev-libs/expat for XML parsing
fam - Enable FAM (File Alteration Monitor) support
fastcgi - Add support for the FastCGI interface
fbcon - Add framebuffer support for the console, via the kernel
ffmpeg - Enable ffmpeg/libav-based audio/video codec support
fftools_aviocat - cat's a URL to another one, useful for dumping streams.
fftools_cws2fws - converts cws files (Macromedia Flash, compressed) to fws ones (Macromedia Flash, uncompressed).
fftools_ffescape - Escapes an input string, adopting the av_get_token() escaping logic.
fftools_ffeval - A simple expression evalutor.
fftools_ffhash - Computes a file's digest using libavutil algorithms.
fftools_fourcc2pixfmt - Shows the relationships between rawvideo pixel formats and FourCC tags.
fftools_graph2dot - A tool to convert a libavfilter graph to a dot file.
fftools_ismindex - A tool for creating smooth streaming manifests.
fftools_pktdumper - Dumps packets as demuxed by libavformat.
fftools_qt-faststart - Rearranges a Quicktime file to facilitate network streaming.
fftools_sidxindex - Write an MPD file for fragmented MP4 files with a sidx index at the start of the file.
fftools_trasher - Writes burts of random data into a file. Great for testing error robustness/resilience/concealment.
fftw - Use FFTW library for computing Fourier transforms
filecaps - Use Linux file capabilities to control privilege rather than set*id (this is orthogonal to USE=caps which uses capabilities at runtime e.g. libcap)
firebird - Add support for the Firebird relational database
flac - Add support for FLAC: Free Lossless Audio Codec
fltk - Add support for the Fast Light Toolkit gui interface
fontconfig - Support for configuring and customizing font access via media-libs/fontconfig
fortran - Add support for fortran
freetds - Add support for the TDS protocol to connect to MSSQL/Sybase databases
freewnn - Add support for FreeWnn kana to kanji conversion engine
ftp - Add FTP (File Transfer Protocol) support
gd - Add support for media-libs/gd (to generate graphics on the fly)
gdbm - Add support for sys-libs/gdbm (GNU database libraries)
generic-uki - Install a generic initramfs and Unified Kernel Image alongside the distribution kernel
geoip - Add geoip support for country and city lookup based on IPs
geolocation - Enable physical position determination
ggi - Add support for media-libs/libggi (non-X video api/drivers)
gif - Add GIF image support
gimp - Build a plugin for the GIMP
git - Enable git (version control system) support
gles2 - Enable GLES 2.0 (OpenGL for Embedded Systems) support (independently of full OpenGL, see also: gles2-only)
gles2-only - Use GLES 2.0 (OpenGL for Embedded Systems) or later instead of full OpenGL (see also: gles2)
glut - Build an OpenGL plugin using the GLUT library
gmp - Add support for dev-libs/gmp (GNU MP library)
gnome - Add GNOME support
gnome-keyring - Enable support for storing passwords via gnome-keyring
gnuplot - Enable support for gnuplot (data and function plotting)
gnutls - Prefer net-libs/gnutls as SSL/TLS provider (ineffective with USE=-ssl)
gphoto2 - Add digital camera support
gpm - Add support for sys-libs/gpm (Console-based mouse driver)
gps - Add support for Global Positioning System
gpsd_protocols_aivdm - AIVDM protocol support
gpsd_protocols_ashtech - Ashtech protocol support
gpsd_protocols_earthmate - Earthmate protocol support
gpsd_protocols_evermore - EverMore protocol support
gpsd_protocols_fury - Jackson Labs Fury and Firefly support
gpsd_protocols_fv18 - FV-18 protocol support
gpsd_protocols_garmin - Garmin protocol support
gpsd_protocols_garmintxt - Garmin Simple Text protocol support
gpsd_protocols_geostar - Geostar Protocol support
gpsd_protocols_gpsclock - GPSclock protocol support
gpsd_protocols_greis - Javad GREIS protocol support
gpsd_protocols_isync - Isync protocol support
gpsd_protocols_itrax - iTrax protocol support
gpsd_protocols_mtk3301 - MTK-3301 protocol support
gpsd_protocols_navcom - Navcom protocol support
gpsd_protocols_nmea0183 - NMEA protocol support
gpsd_protocols_nmea2000 - NMEA2000/CAN support
gpsd_protocols_ntrip - NTRIP protocol support
gpsd_protocols_oceanserver - OceanServer protocol support
gpsd_protocols_oncore - OnCore protocol support
gpsd_protocols_passthrough - Pass through JSON data
gpsd_protocols_rtcm104v2 - RTCM104V2 protocol support
gpsd_protocols_rtcm104v3 - RTCM104V3 protocol support
gpsd_protocols_sirf - SiRF protocol support
gpsd_protocols_skytraq - Skytraq protocol support
gpsd_protocols_superstar2 - SuperStarII protocol support
gpsd_protocols_tnt - True North protocol support
gpsd_protocols_tripmate - Tripmate protocol support
gpsd_protocols_tsip - Trimble TSIP protocol support
gpsd_protocols_ublox - U-Blox Protocol support
graphicsmagick - Build and link against GraphicsMagick instead of ImageMagick (requires USE=imagemagick if optional)
graphviz - Add support for the Graphviz library
grub_platforms_coreboot - Coreboot platform support
grub_platforms_efi-32 - EFI 32 bit platform support (Old MACs)
grub_platforms_efi-64 - EFI 64 bit platform support
grub_platforms_emu - Emulation platform support
grub_platforms_ieee1275 - IEEE1275 platform support
grub_platforms_loongson - MIPS loongson platform support
grub_platforms_multiboot - Multiboot platform support
grub_platforms_pc - PC platform support
grub_platforms_qemu - QEMU platform support
grub_platforms_qemu-mips - QEMU MIPS platform support
grub_platforms_uboot - U-Boot platform support
grub_platforms_xen - XEN (pvgrub2) platform support
grub_platforms_xen-32 - Build 32-bit XEN (pvgrub2) platform support on amd64
grub_platforms_xen-pvh - XEN (pvhgrub2) platform support
gsl - Use the GNU scientific library for calculations
gsm - Add support for the gsm lossy speech compression codec
gstreamer - Add support for media-libs/gstreamer (Streaming media)
gtk - Add support for x11-libs/gtk+ (The GIMP Toolkit)
gtk-doc - Build and install gtk-doc based developer documentation for dev-util/devhelp, IDE and offline use
gtkhtml - Add support for gnome-extra/gtkhtml
gui - Enable support for a graphical user interface
guile - Add support for the guile Scheme interpreter
guile_single_target_2-2 - Build only for GNU Guile 2.2.
guile_single_target_3-0 - Build only for GNU Guile 3.0.
guile_targets_2-2 - Build with GNU Guile 2.2
guile_targets_3-0 - Build with GNU Guile 3.0
gzip - Compress files with Lempel-Ziv coding (LZ77)
handbook - Enable handbooks generation for packages by KDE
hardened - Activate default security enhancements for toolchain (gcc, glibc, binutils)
hddtemp - Enable monitoring of hdd temperature (app-admin/hddtemp)
hdf5 - Add support for the Hierarchical Data Format v5
headers-only - Install only C headers instead of whole package. Mainly used by sys-devel/crossdev for toolchain bootstrap.
heif - Enable support for ISO/IEC 23008-12:2017 HEIF/HEIC image format
hscolour - Include coloured haskell sources to generated documentation (dev-haskell/hscolour)
http2 - Enable support for the HTTP/2 protocol
ibm - Add support for IBM ppc64 specific systems
iconv - Enable support for the iconv character set conversion library
icu - Enable ICU (Internationalization Components for Unicode) support, using dev-libs/icu
idn - Enable support for Internationalized Domain Names
ieee1394 - Enable FireWire/iLink IEEE1394 support (dv, camera, ...)
imagemagick - Enable optional support for the ImageMagick or GraphicsMagick image converter
imap - Add support for IMAP (Internet Mail Application Protocol)
imlib - Add support for imlib, an image loading and rendering library
index64 - Enable 64-bit array indexing support
infiniband - Enable Infiniband RDMA transport support
initramfs - Include kernel modules in the initramfs, and re-install the kernel (only effective for distribution kernels)
inotify - Enable inotify filesystem monitoring support
input_devices_elographics - INPUT_DEVICES setting to build driver for elographics input devices
input_devices_evdev - INPUT_DEVICES setting to build driver for evdev input devices
input_devices_joystick - INPUT_DEVICES setting to build driver for joystick input devices
input_devices_libinput - INPUT_DEVICES setting to build driver for libinput input devices
input_devices_roccat_arvo - INPUT_DEVICES setting to build driver for Roccat Arvo input devices
input_devices_roccat_isku - INPUT_DEVICES setting to build driver for Roccat Isku input devices
input_devices_roccat_iskufx - INPUT_DEVICES setting to build driver for Roccat Isku Fx input devices
input_devices_roccat_kiro - INPUT_DEVICES setting to build driver for Roccat Kiro input devices
input_devices_roccat_kone - INPUT_DEVICES setting to build driver for Roccat Kone input devices
input_devices_roccat_koneplus - INPUT_DEVICES setting to build driver for Roccat Kone[+] input devices
input_devices_roccat_konepure - INPUT_DEVICES setting to build driver for Roccat Kone Pure input devices
input_devices_roccat_konepuremilitary - INPUT_DEVICES setting to build driver for Roccat Kone Pure Military input devices
input_devices_roccat_konepureoptical - INPUT_DEVICES setting to build driver for Roccat Kone Pure Optical input devices
input_devices_roccat_konextd - INPUT_DEVICES setting to build driver for Roccat KoneXTD input devices
input_devices_roccat_konextdoptical - INPUT_DEVICES setting to build driver for Roccat KoneXTD Optical input devices
input_devices_roccat_kova2016 - INPUT_DEVICES setting to build driver for Roccat Kova 2016 input devices
input_devices_roccat_kovaplus - INPUT_DEVICES setting to build driver for Roccat Kova[+] input devices
input_devices_roccat_lua - INPUT_DEVICES setting to build driver for Roccat Lua input devices
input_devices_roccat_nyth - INPUT_DEVICES setting to build driver for Roccat Nyth input devices
input_devices_roccat_pyra - INPUT_DEVICES setting to build driver for Roccat Pyra input devices
input_devices_roccat_ryosmk - INPUT_DEVICES setting to build driver for Roccat RyosMK Pro input devices
input_devices_roccat_ryosmkfx - INPUT_DEVICES setting to build driver for Roccat RyosMK FX input devices
input_devices_roccat_ryostkl - INPUT_DEVICES setting to build driver for Roccat RyosMK Pro input devices
input_devices_roccat_savu - INPUT_DEVICES setting to build driver for Roccat Savu input devices
input_devices_roccat_skeltr - INPUT_DEVICES setting to build driver for Roccat Skeltr input devices
input_devices_roccat_sova - INPUT_DEVICES setting to build driver for Roccat Sova input devices
input_devices_roccat_suora - INPUT_DEVICES setting to build driver for Roccat Suora input devices
input_devices_roccat_tyon - INPUT_DEVICES setting to build driver for Roccat Tyon input devices
input_devices_synaptics - INPUT_DEVICES setting to build driver for synaptics input devices
input_devices_vmmouse - INPUT_DEVICES setting to build driver for vmmouse input devices
input_devices_void - INPUT_DEVICES setting to build driver for void/dummy input devices
input_devices_wacom - INPUT_DEVICES setting to build driver for wacom input devices
introspection - Add support for GObject based introspection
iodbc - Add support for iODBC library
ios - Enable support for Apple's iDevice with iOS operating system (iPad, iPhone, iPod, etc)
io-uring - Enable the use of io_uring for efficient asynchronous IO and system requests
ipod - Enable support for iPod device access
ipv6 - Add support for IP version 6
jack - Add support for the JACK Audio Connection Kit
java - Add support for Java
javascript - Enable javascript support
jbig - Enable jbig-kit support for tiff, Hylafax, ImageMagick, etc
jemalloc - Use dev-libs/jemalloc for memory management
jit - Enable just-in-time compilation for improved performance. May prevent use of some PaX memory protection features in Gentoo Hardened.
joystick - Add support for joysticks in all packages
jpeg - Add JPEG image support
jpeg2k - Support for JPEG 2000, a wavelet-based image compression format
jpegxl - Add JPEG XL image support
kde - Add support for software made by KDE, a free software community
kerberos - Add kerberos support
kernel_Darwin - KERNEL setting for system using the Darwin kernel (i.e.: Mac OS X).
kernel_Hurd - KERNEL setting for system using the GNU Hurd
kernel_linux - KERNEL setting for system using the Linux kernel
kernel_SunOS - KERNEL setting for system using an SunOS (i.e.: Solaris) kernel
kernel_Winnt - KERNEL setting for systems on Windows (Cygwin, MinGW, Winnt, ...)
keyring - Enable support for freedesktop.org Secret Service API password store
l10n_ach - Acoli
l10n_af - Afrikaans
l10n_am - Amharic
l10n_an - Aragonese
l10n_ar - Arabic
l10n_as - Assamese
l10n_ast - Asturian
l10n_az - Azerbaijani
l10n_be - Belarusian
l10n_bea - Beaver
l10n_bg - Bulgarian
l10n_bn - Bengali
l10n_bn-IN - Bengali (India)
l10n_bo - Tibetan
l10n_br - Breton
l10n_brx - Bodo (India)
l10n_bs - Bosnian
l10n_ca - Catalan
l10n_cak - Kaqchikel
l10n_ca-valencia - Catalan (Valencian)
l10n_ceb - Cebuano
l10n_ch - Chamorro
l10n_chr - Cherokee
l10n_ckb - Central Kurdish
l10n_co - Corsican
l10n_cop - Coptic
l10n_cs - Czech
l10n_csb - Kashubian
l10n_cu - Church Slavic
l10n_cy - Welsh
l10n_da - Danish
l10n_de - German
l10n_de-1901 - German (traditional orthography)
l10n_de-AT - German (Austria)
l10n_de-CH - German (Switzerland)
l10n_de-DE - German (Germany)
l10n_dgo - Dogri (individual language)
l10n_doi - Dogri (macrolanguage)
l10n_dsb - Lower Sorbian
l10n_dv - Dhivehi
l10n_dz - Dzongkha
l10n_el - Modern Greek
l10n_en - English
l10n_en-AU - English (Australia)
l10n_en-CA - English (Canada)
l10n_en-GB - English (United Kingdom)
l10n_en-US - English (United States)
l10n_en-ZA - English (South Africa)
l10n_eo - Esperanto
l10n_es - Spanish
l10n_es-419 - Spanish (Latin America)
l10n_es-AR - Spanish (Argentina)
l10n_es-CL - Spanish (Chile)
l10n_es-ES - Spanish (Spain)
l10n_es-MX - Spanish (Mexico)
l10n_es-PE - Spanish (Peru)
l10n_et - Estonian
l10n_eu - Basque
l10n_fa - Persian
l10n_ff - Fulah
l10n_fi - Finnish
l10n_fil - Filipino
l10n_fo - Faroese
l10n_fr - French
l10n_fr-CA - French (Canada)
l10n_fur - Friulian
l10n_fy - Western Frisian
l10n_ga - Irish
l10n_gd - Scottish Gaelic
l10n_gez - Geez
l10n_gl - Galician
l10n_gn - Guarani
l10n_got - Gothic
l10n_grc - Ancient Greek (to 1453)
l10n_gu - Gujarati
l10n_gug - Paraguayan Guarani
l10n_gv - Manx
l10n_he - Hebrew
l10n_hi - Hindi
l10n_hil - Hiligaynon
l10n_hr - Croatian
l10n_hsb - Upper Sorbian
l10n_ht - Haitian
l10n_hu - Hungarian
l10n_hus - Huastec
l10n_hy - Armenian
l10n_ia - Interlingua
l10n_id - Indonesian
l10n_io - Ido
l10n_is - Icelandic
l10n_it - Italian
l10n_iu - Inuktitut
l10n_ja - Japanese
l10n_jbo - Lojban
l10n_jv - Javanese
l10n_ka - Georgian
l10n_kab - Kabyle
l10n_kek - Kekchí
l10n_kk - Kazakh
l10n_km - Central Khmer
l10n_kmr - Northern Kurdish
l10n_kmr-Latn - Northern Kurdish (Latin script)
l10n_kn - Kannada
l10n_ko - Korean
l10n_kok - Konkani (macrolanguage)
l10n_kpg - Kapingamarangi
l10n_ks - Kashmiri
l10n_ktu - Kituba (Democratic Republic of Congo)
l10n_ku - Kurdish
l10n_ky - Kirghiz
l10n_la - Latin
l10n_lb - Luxembourgish
l10n_lij - Ligurian
l10n_ln - Lingala
l10n_lo - Lao
l10n_lt - Lithuanian
l10n_lv - Latvian
l10n_mai - Maithili
l10n_mg - Malagasy
l10n_mi - Maori
l10n_mk - Macedonian
l10n_ml - Malayalam
l10n_mn - Mongolian
l10n_mni - Manipuri
l10n_mr - Marathi
l10n_ms - Malay (macrolanguage)
l10n_mt - Maltese
l10n_my - Burmese
l10n_nan - Min Nan Chinese
l10n_nb - Norwegian Bokmål
l10n_nd - North Ndebele
l10n_nds - Low German
l10n_ne - Nepali
l10n_nl - Dutch
l10n_nn - Norwegian Nynorsk
l10n_no - Norwegian
l10n_nr - South Ndebele
l10n_nso - Northern Sotho
l10n_ny - Chichewa
l10n_oc - Occitan
l10n_om - Oromo
l10n_or - Oriya (macrolanguage)
l10n_pa - Punjabi
l10n_pl - Polish
l10n_pon - Pohnpeian
l10n_pot - Potawatomi
l10n_ppk - Uma
l10n_prs - Dari
l10n_ps - Pushto
l10n_pt - Portuguese
l10n_pt-BR - Portuguese (Brazil)
l10n_pt-PT - Portuguese (Portugal)
l10n_qu - Quechua
l10n_rm - Romansh
l10n_rmq - Caló
l10n_ro - Romanian
l10n_ru - Russian
l10n_rw - Kinyarwanda
l10n_sa - Sanskrit
l10n_sat - Santali
l10n_sc - Sardinian
l10n_sco - Scots
l10n_sd - Sindhi
l10n_si - Sinhala
l10n_sid - Sidamo
l10n_sk - Slovak
l10n_skr - Saraiki
l10n_sl - Slovenian
l10n_sml - Central Sama
l10n_sn - Shona
l10n_so - Somali
l10n_son - Songhai languages
l10n_sq - Albanian
l10n_sr - Serbian
l10n_sr-Latn - Serbian (Latin script)
l10n_ss - Swati
l10n_st - Southern Sotho
l10n_su - Sundanese
l10n_sv - Swedish
l10n_sw - Swahili (macrolanguage)
l10n_sw-TZ - Swahili (Tanzania)
l10n_syc - Classical Syriac
l10n_syr - Syriac
l10n_szl - Silesian
l10n_ta - Tamil
l10n_te - Telugu
l10n_tet - Tetum
l10n_tg - Tajik
l10n_th - Thai
l10n_ti - Tigrinya
l10n_tk - Turkmen
l10n_tl - Tagalog
l10n_tlh - Klingon
l10n_tn - Tswana
l10n_to - Tonga (Tonga Islands)
l10n_tr - Turkish
l10n_trs - Chicahuaxtla Triqui
l10n_ts - Tsonga
l10n_tsg - Tausug
l10n_tt - Tatar
l10n_ug - Uyghur
l10n_uk - Ukrainian
l10n_ur - Urdu
l10n_uz - Uzbek
l10n_ve - Venda
l10n_vec - Venetian
l10n_vi - Vietnamese
l10n_vls - Vlaams
l10n_wa - Walloon
l10n_xh - Xhosa
l10n_yi - Yiddish
l10n_yo - Yoruba
l10n_zh - Chinese
l10n_zh-CN - Chinese (China)
l10n_zh-HK - Chinese (Hong Kong)
l10n_zh-TW - Chinese (Taiwan)
l10n_zu - Zulu
ladspa - Enable the ability to support ladspa plugins
lame - Add support for MP3 encoding using LAME
lapack - Add support for the virtual/lapack numerical library
lash - Add LASH Audio Session Handler support
latex - Add support for LaTeX (typesetting package)
lcd_devices_acoolsdcm - Add support for Alphacool USB display modules
lcd_devices_astusb - Add support for ASTUSB LCD modules
lcd_devices_ax206dpf - Add support for AX206 DPF LCD modules
lcd_devices_bayrad - Add support for BayRAD LCD modules by EMAC
lcd_devices_beckmannegle - Add support for Beckmann+Egle "Mini Terminals" and "Compact Terminals"
lcd_devices_bwct - Add support for BWCT USB LCD displays
lcd_devices_cfontz - Add support for CrystalFontz displays
lcd_devices_cfontzpacket - Add support for CrystalFontz chipsets CFA-631, CFA-633 and CFA-635
lcd_devices_crystalfontz - Add support for modern Crystalfontz display modules
lcd_devices_curses - Add support for a ncurses based virtual display
lcd_devices_cwlinux - Add support for serial / USB displays CW12232 and CW1602 by CwLinux
lcd_devices_cwlnx - Add support for serial / USB displays CW12232 and CW1602 by CwLinux
lcd_devices_d4d - Add support for 4D Systems display graphics modules with SGC PmmC
lcd_devices_ddusbt - Add support for DD usb touch screen
lcd_devices_directgfx - Add support for output via SDL
lcd_devices_displaylink - Add support for displaylink based LCDs
lcd_devices_dpf - Add support for DPF display modulees
lcd_devices_dpfax - Add support for AX206 photo frames
lcd_devices_ea232graphic - Add support for the Electronic Assembly RS232 graphic driver
lcd_devices_ea65 - Add support for the VFD in the AOpen XC Cube-AV EA65 media barebone
lcd_devices_efn - Add support for the English Font display Network based displays
lcd_devices_eyeboxone - Add support for the displays on Rightvision's EyeboxOne server
lcd_devices_framebuffer - Add support for output on a framebuffer
lcd_devices_futaba - Add support for Futaba M402SD06GL display module
lcd_devices_futabavfd - Add support for Futaba M402SD06GL display module
lcd_devices_fw8888 - Add support for the Allnet FW8888 firewall appliance LCD
lcd_devices_g15 - Add support for Logitech G15 Keyboard LCDs
lcd_devices_glcd - Add support for various graphical LCDs, like GLCD2USB
lcd_devices_glcd2usb - Add support for GLCD2USB LCD module
lcd_devices_glcdlib - Add support for LCDs, which are supported by graphlcd-base
lcd_devices_glk - Add support for MatrixOrbital GLK chipset
lcd_devices_goldelox - Add support for Goldelox MD1 display modules
lcd_devices_hd44780 - Add support for Hitachi HD44780 and compatible displays
lcd_devices_hd44780-i2c - Enable hd44780 via i2c instead of parallel port driver
lcd_devices_i2500vfd - Add support for the Intra2net Intranator 2500 VFD display
lcd_devices_i2c - Add generic support for i2c based modules
lcd_devices_icp_a106 - Add support for ICP A106 alarm/LCD boards for 19" racks
lcd_devices_imon - Add support for Soundgraph/Ahanix/Silverstone/Uneed/Accent iMON IR/VFD modules (Antec Fusion)
lcd_devices_imonlcd - Add support for Soundgraph iMON LCD modules (Antec Fusion)
lcd_devices_iowarrior - Add support for IO-Warrior displays
lcd_devices_irlcd - Add support for the USBtiny DIY USB to IR receiver
lcd_devices_irman - Add support for the IrMan IR remote
lcd_devices_irtrans - Add support for the 16x2 IRTrans VFD device
lcd_devices_joy - Add support for the joystick input driver, used on various LCD keypads
lcd_devices_jw002 - Add support for PJRC JW002 24x8 LCD display
lcd_devices_ks0108 - Add support for KS0108 based graphical LCDs
lcd_devices_l4m - Add support for Linux4Media displays
lcd_devices_lb216 - Add support for RTN's LB216 display
lcd_devices_lc7981 - Add support for the DG-16080 display family
lcd_devices_lcd2usb - Add support for the open lcd2usb connector to hd44780 displays
lcd_devices_lcdm001 - Add support for the Kernelconcepts LCDM001 display
lcd_devices_lcdterm - Add support for LCDTerm serial-to-HD44780 adapter boards
lcd_devices_lcterm - Add support for Neumark's LCTerm serial LCD
lcd_devices_ledmatrix - Add support for SLM1606/8 LED Matrix displays
lcd_devices_lh155 - Add support for Sharp LH155 based displays
lcd_devices_linux_input - Add support for the linux event device for inputting data from the input.
lcd_devices_lirc - Add support for various IR remotes supported by LIRC
lcd_devices_lis - Add support for the VLSystem L.I.S MCE 2005 VFD
lcd_devices_lph7508 - Add support for the Pollin LPH7508
lcd_devices_luise - Add support for the Wallbraun Electronics LCD-USB-Interface to Hitachi SP14Q002
lcd_devices_lw_abp - Add support for the LW_ABP display module
lcd_devices_m50530 - Add support for M50530 and compatible displays
lcd_devices_matrixorbital - Add support for Matrix Orbital LCDs
lcd_devices_matrixorbitalgx - Add support for Matrix Orbital graphical LCDs
lcd_devices_md8800 - Add support for the VFD of the Medion MD8800 PC
lcd_devices_mdm166a - Add support for the Futaba / Targa USB Graphic Vacuum Fluorescent Display
lcd_devices_milfordinstruments - Add support for Milford Intruments LCDs
lcd_devices_ms6931 - Add support for MSI-6931 displays in MSI rack servers
lcd_devices_mtc_s16209x - Add support for MTC_S16209x displays
lcd_devices_mtxorb - Add support for Matrix Orbital LCD* LKD* VFD* and VKD* displays
lcd_devices_mx5000 - Add support for the Logitech MX5000 keyboard with an integrated LCD
lcd_devices_newhaven - Add support for various Newhaven displays
lcd_devices_nokcol - Add support for Nokias 3510i and 3530 display modules
lcd_devices_noritake - Add support for the Noritake GU128x32-311 graphical display
lcd_devices_noritakevfd - Add support for the Noritake VFD Device CU20045SCPB-T28A
lcd_devices_null - Add support for a NULL driver (for testing)
lcd_devices_olimex_mod_lcd1x9 - Add support for the Olimex MOD-LCD1x9 LCD display
lcd_devices_pcd8544 - Add support for PCD8544 and compilant display modules
lcd_devices_pertelian - Add support for the Pertelian X2040 displays
lcd_devices_phanderson - Add support for the PHAnderson serial-to-HD44780 controller
lcd_devices_picgraphic - Add support for PIC graphic displays
lcd_devices_picolcd - Add support for Mini-Box's picoLCD
lcd_devices_picolcd_256x64 - Add support for Mini-Box's picoLCD with a higher resolution
lcd_devices_picolcdgraphic - Add support for Mini-Box's graphical picoLCD
lcd_devices_png - Add support for PNG output
lcd_devices_ppm - Add support for PNG output
lcd_devices_pyramid - Add support for the Pyramid LCD device
lcd_devices_rawserial - Add suppor for the rawserial interface on hd44780 LCD displays
lcd_devices_remote - Add suport for remote display modules
lcd_devices_routerboard - Add support for the Router Board LCD port
lcd_devices_rs232 - Add support for generic RS232 based displays
lcd_devices_sample - Add support for the sample driver
lcd_devices_samsungspf - Add support for Samsung SPF displays
lcd_devices_sdeclcd - Add support for Watchguard FireBox firewall appliances displays
lcd_devices_sed1330 - Add support for Seiko Epson SED1330/1335 graphical displays (S1D13300/S1D13305)
lcd_devices_sed133x - Add support for SED133x based display modules
lcd_devices_sed1520 - Add support for the Seiko Epson SED1520 Controller
lcd_devices_sed153x - Add support for OPTREX 323 based display modules
lcd_devices_sed156x - Add support for Nokias 7110 display module
lcd_devices_serdisplib - Meta-driver to support drivers via dev-libs/serdisplib
lcd_devices_serialpos - Add support for character displays in serial point of sale ("POS") devices
lcd_devices_serialvfd - Add support for most NEC, Futaba and Noritake VFDs
lcd_devices_shuttlevfd - Add support for several Shuttle VFDs such as M1000, M2000, G5 3300m and SG33G5M
lcd_devices_simplelcd - Add support for a simple serial terminal display
lcd_devices_sli - Add support for a Wirz SLI display
lcd_devices_ssdoled - Add support for Bolymin BL160128A OLED display
lcd_devices_stv5730 - Add support for STV5730A on-screen display chips
lcd_devices_stv8105 - Add support for STV8105 on-screen display chips
lcd_devices_sureelec - Add support drivers from the 'SURE electronics' shop
lcd_devices_t6963 - Add support for Toshiba T6963 based LCD displays
lcd_devices_teaklcm - Add support for TeakLCM displays
lcd_devices_text - Add support for TextMode displaying
lcd_devices_trefon - Add support for Trefon USB LCD displays
lcd_devices_tyan - Add support for LCDs of the Barebone GS series
lcd_devices_ula200 - Add support for ULA200 USB devices that allow USB connection of HD44780s
lcd_devices_usbhub - Add support for USBHUB displays
lcd_devices_usblcd - Add support for USBLCD displays
lcd_devices_vlsys_m428 - Add support for MonCaso 320 LCD displays
lcd_devices_vnc - Add support for output on a vnc connection
lcd_devices_vssdcp - Add support for network-based vssdcp protocol LCD displays
lcd_devices_wincornixdorf - Add support for the WincorNixdorf serial cashier displays BA63 and BA66
lcd_devices_x11 - Add support for X11 displaying
lcd_devices_xosd - Add support for xosdlib
lcd_devices_yard2lcd - Add support for the Y.A.R.D. 2 LCD display and remote
lcms - Add lcms support (color management engine)
ldap - Add LDAP support (Lightweight Directory Access Protocol)
lerc - Add LERC suppport (Limited Error Raster Compression)
libass - SRT/SSA/ASS (SubRip / SubStation Alpha) subtitle support
libav - Prefer libav over ffmpeg whenever both are supported
libcaca - Add support for colored ASCII-art graphics
libedit - Use the libedit library (replacement for readline)
libffi - Enable support for Foreign Function Interface library
libnotify - Enable desktop notification support
libreoffice_extensions_nlpsolver - LIBREOFFICE_EXTENSIONS option to build non-linear solver for calc
libreoffice_extensions_scripting-beanshell - LIBREOFFICE_EXTENSIONS option to build beanshell scripts parser
libreoffice_extensions_scripting-javascript - LIBREOFFICE_EXTENSIONS option to build javascript scripts parser
libreoffice_extensions_wiki-publisher - LIBREOFFICE_EXTENSIONS option to build mediawiki integration
libressl - Use dev-libs/libressl instead of dev-libs/openssl when applicable (see also the ssl useflag)
libsamplerate - Build with support for converting sample rates using libsamplerate
libwww - Add libwww support (General purpose WEB API)
linguas_bg - Bulgarian locale
linguas_en - English locale
linguas_ja - Japanese locale
linguas_pt_BR - Portuguese locale for Brasil
linguas_zh_CN - Chinese locale for Peoples Republic of China
lirc - Add support for lirc (Linux's Infra-Red Remote Control)
livecd - !!internal use only!! DO NOT SET THIS FLAG YOURSELF!, used during livecd building
llvm-libunwind - Use llvm-runtimes/libunwind instead of sys-libs/libunwind
llvm_slot_15 - Use LLVM 15.
llvm_slot_16 - Use LLVM 16.
llvm_slot_17 - Use LLVM 17.
llvm_slot_18 - Use LLVM 18.
llvm_slot_19 - Use LLVM 19.
llvm_slot_20 - Use LLVM 20.
llvm_slot_21 - Use LLVM 21.
llvm_slot_22 - Use LLVM 22.
llvm_slot_23 - Use LLVM 23.
llvm_targets_AArch64 - AArch64 CPU target (arm64 in Gentoo)
llvm_targets_AMDGPU - AMDGPU target (supports R600 and GCN GPUs)
llvm_targets_ARC - ARC (Argonaut RISC Core) embedded CPU target [EXPERIMENTAL]
llvm_targets_ARM - ARM CPU target
llvm_targets_AVR - 8-bit Atmel AVR microcontroller target
llvm_targets_BPF - Berkeley Packet Filter target
llvm_targets_CSKY - C-SKY CPU target [EXPERIMENTAL]
llvm_targets_DirectX - DirectX target [EXPERIMENTAL]
llvm_targets_Hexagon - Qualcomm Hexagon DSP target
llvm_targets_Lanai - Lanai CPU target
llvm_targets_LoongArch - LoongArch CPU support [EXPERIMENTAL]
llvm_targets_M68k - Motorola 68000 target [EXPERIMENTAL]
llvm_targets_Mips - MIPS CPU target (includes MIPS64)
llvm_targets_MSP430 - MSP430 CPU target (experimental)
llvm_targets_NVPTX - NVIDIA PTX (GPU) target (32-bit and 64-bit)
llvm_targets_PowerPC - PowerPC CPU target (PPC32 and PPC64)
llvm_targets_RISCV - RISC-V CPU target
llvm_targets_Sparc - Sparc CPU target
llvm_targets_SPIRV - Support SPIR-V language target for graphics and parallel computing
llvm_targets_SystemZ - SystemZ (s390x) CPU target
llvm_targets_VE - NEC SX-Aurora TSUBASA vector engine target
llvm_targets_WebAssembly - WebAssembly backend
llvm_targets_X86 - X86 CPU target (includes amd64)
llvm_targets_XCore - XCore CPU target
llvm_targets_Xtensa - Tensilica Xtensa (ESP32) CPU target [EXPERIMENTAL]
lm-sensors - Add linux lm-sensors (hardware sensors) support
lto - Enable Link-Time Optimization (LTO) to optimize the build
lua - Enable Lua scripting support
lua_single_target_lua5-1 - Build for Lua 5.1 only
lua_single_target_lua5-3 - Build for Lua 5.3 only
lua_single_target_lua5-4 - Build for Lua 5.4 only
lua_single_target_luajit - Build for LuaJIT only
lua_targets_lua5-1 - Build with Lua 5.1
lua_targets_lua5-3 - Build with Lua 5.3
lua_targets_lua5-4 - Build with Lua 5.4
lua_targets_luajit - Build with LuaJIT
lz4 - Enable support for lz4 compression (as implemented in app-arch/lz4)
lzip - Enable support for lzip compression
lzma - Support for LZMA compression algorithm
lzo - Enable support for lzo compression
m17n-lib - Enable m17n-lib support
mad - Add support for mad (high-quality mp3 decoder library and cli frontend)
magic - Add support for file type detection via magic bytes (usually via libmagic from sys-apps/file)
maildir - Add support for maildir (~/.maildir) style mail spools
man - Build and install man pages
matroska - Add support for the matroska container format (extensions .mkv, .mka and .mks)
mbox - Add support for mbox (/var/spool/mail) style mail spools
memcached - Add support for memcached
mhash - Add support for the mhash library
mikmod - Add libmikmod support to allow playing of SoundTracker-style music files
milter - Add sendmail mail filter (milter) support
minimal - Install a very minimal build (disables, for example, plugins, fonts, most drivers, non-critical features)
mmap - Add mmap (memory map) support
mms - Support for Microsoft Media Server (MMS) streams
mng - Add support for libmng (MNG images)
modplug - Add libmodplug support for playing SoundTracker-style music files
modules - Build the kernel modules
modules-compress - Install compressed kernel modules (if kernel config enables module compression)
modules-sign - Cryptographically sign installed kernel modules (requires CONFIG_MODULE_SIG=y in the kernel)
monkeyd_plugins_auth - Provide HTTP Basic Authentication.
monkeyd_plugins_cheetah - Provide a shell-like command line interface.
monkeyd_plugins_dirlisting - Show an HTML listing of the content of a directory.
monkeyd_plugins_liana - Build your own network layer through monkeyd.
monkeyd_plugins_logger - Log requests and common errors.
monkeyd_plugins_mandril - Restrict incoming connections based on the IP address or URI request.
monkeyd_plugins_tls - Provide TLS using mbed TLS (formerly known as PolarSSL) - Currently disabled.
mono - Build Mono bindings to support dotnet type stuff
motif - Add support for the Motif toolkit
mp3 - Add support for reading mp3 files
mp4 - Support for MP4 container format
mpeg - Add libmpeg3 support to various packages
mpi - Add MPI (Message Passing Interface) layer to the apps that support it
mplayer - Enable mplayer support for playback or encoding
msn - Enable MSN Messenger IM protocol support
mssql - Add support for Microsoft SQL Server database
mtp - Enable support for Media Transfer Protocol
multilib - On 64bit systems, if you want to be able to compile 32bit and 64bit binaries
musepack - Enable support for the musepack audio codec
musicbrainz - Lookup audio metadata using MusicBrainz community service (musicbrainz.org)
mysql - Add mySQL Database support
mysqli - Add support for the improved mySQL libraries
nas - Add support for network audio sound
native-extensions - Build native (e.g. C, Rust) extensions in addition to pure (e.g. Python) code (usually speedups)
ncurses - Add ncurses support (console display library)
netcdf - Enable NetCDF data format support
networkmanager - Enable net-misc/networkmanager support
neXt - Enable neXt toolkit
nginx_modules_http_access - Add support for a simple host-based access control
nginx_modules_http_addition - Add support for adding contents of other locations before and after the current location's content
nginx_modules_http_auth_basic - Add support for limiting access to a location by validating the username and password using the HTTP Basic Authentication
nginx_modules_http_auth_ldap - Add support for LDAP authentication module for NGINX
nginx_modules_http_auth_pam - Add support for authentication via PAM
nginx_modules_http_auth_request - Add support for client authorization based on the result of a subrequest
nginx_modules_http_autoindex - Add support for processing requests ending with the slash character ('/') and produciing a directory listing
nginx_modules_http_brotli - Add support for on-the-fly Brotli compression
nginx_modules_http_browser - Add support for creating variables whose values depend on the value of the "User-Agent" request header field
nginx_modules_http_cache_purge - Add support for purging content from NGINX's FastCGI and proxy caches
nginx_modules_http_charset - Add support for adding the specified charset to the "Content-Type" response header field and reencoding singe-byte charsets
nginx_modules_http_dav - Add support for the WebDAV functionality and methods: PUT, DELETE, MKCOL, COPY and MOVE
nginx_modules_http_dav_ext - Add support for the additional WebDAV methods into the existing WebDAV module: PROPFIND & OPTIONS
nginx_modules_http_degradation - Add support for returning 204 or 444 code for some locations on low memory condition (reliable on FreeBSD only)
nginx_modules_http_echo - Add support for shell-style goodies in the NGINX configuration file
nginx_modules_http_empty_gif - Add support for emiting a single-pixel transparent GIF
nginx_modules_http_fancyindex - Add support for the fancy generation of file listings
nginx_modules_http_fastcgi - Add support for passing requests to a FastCGI server
nginx_modules_http_flv - Add support for the server-side pseudo-streaming of Flash Video (FLV) files
nginx_modules_http_geo - Add support for creating variables whose values depend on the client IP-address
nginx_modules_http_geoip - Add support for creating variables whose values depend on the client IP-address, using the precompiled MaxMind databases
nginx_modules_http_geoip2 - Add support for creating variables whose values depend on the client IP-address, using the precompiled MaxMind GeoIP2 databases
nginx_modules_http_grpc - Add support for passing requests to a gRPC server
nginx_modules_http_gunzip - Add support for decompressing responses with "Content-Encoding: gzip" for clients that do not support "gzip" encoding method
nginx_modules_http_gzip - Add support for compressing responses using the "gzip" method
nginx_modules_http_gzip_static - Add support for sending precompressed files with the ".gz" filename extension instead of regular files
nginx_modules_http_headers_more - Add support for setting arbitrary input and output headers
nginx_modules_http_image_filter - Add support for transforming images in JPEG, GIF, PNG, and WebP formats
nginx_modules_http_javascript - Add support for implementing location and variable handlers in njs - a subset of the JavaScript language
nginx_modules_http_limit_conn - Add support for limiting the number of connections per a defined key, e.g. the number of connections from a single IP address
nginx_modules_http_limit_req - Add support for limiting the request processing rate per a defined key, e.g. the processing rate of requests coming from a single IP address
nginx_modules_http_lua - Add support for Lua scripting in NGINX
nginx_modules_http_map - Add support for creating variables whose values depend on values of other variables
nginx_modules_http_memc - Add support for an extended version of the standard memcached module that supports set, add, delete, and many more memcached commands
nginx_modules_http_memcached - Add support for obtaining responses from a memcached server
nginx_modules_http_metrics - Add support for exporting various metrics in an easy-parseable JSON format
nginx_modules_http_mirror - Add support for mirroring of the original request by creating background mirror subrequests
nginx_modules_http_mogilefs - Add support for MogileFS
nginx_modules_http_mp4 - Add support for server-side pseudo-streaming for MP4 files
nginx_modules_http_naxsi - Add support for NAXSI WAF (Web Application Firewall)
nginx_modules_http_perl - Add support for implementing location and variable handlers in Perl and inserting Perl calls into SSI
nginx_modules_http_proxy - Add support for passing subrequests to another server
nginx_modules_http_push_stream - Add support for the stream HTTP push module, which supports EventSource, WebSocket, Long Polling, and Forever Iframe
nginx_modules_http_random_index - Add support for processing requests ending with the slash character ('/') by picking a random file in a directory to serve as an index file
nginx_modules_http_realip - Add support for setting the client address and optional port to those sent in the specified header field (e.g. "X-Real-IP" or "X-Forwarded-For")
nginx_modules_http_referer - Add support for blocking access to a site for requests with invalid values in the "Referer" header field
nginx_modules_http_rewrite - Add support for changing the request URI using PCRE regular expressions, returning redirects, and conditionally selecting configurations
nginx_modules_http_scgi - Add support for passing requests to an SCGI server
nginx_modules_http_secure_link - Add support for checking authenticity of requested links, protecting resources from unauthorized access, and limiting link lifetime
nginx_modules_http_security - Add support for modsecurity: web application firewall and intrusion detection system
nginx_modules_http_slice - Add support for spliting a request into subrequests, each returning a certain range of response
nginx_modules_http_slowfs_cache - Add support for caching static files
nginx_modules_http_spdy - Add support for an SPDY implementation. (Deprecated, use USE="nginx_modules_http_v2" instead)
nginx_modules_http_split_clients - Add support for creating variables suitable for A/B testing, also known as split testing
nginx_modules_http_ssi - Add support for processing SSI (Server Side Includes) commands in responses passing through NGINX
nginx_modules_http_ssl - Add support for HTTPS - SSL/TLS-encrypted HTTP
nginx_modules_http_sticky - Add support for sending a sticky cookie in order to always forward client to the same upstream server
nginx_modules_http_stub_status - Add support for providing access to basic status information
nginx_modules_http_sub - Add support for modifying a response by replacing one specified string by another
nginx_modules_http_upload_progress - Add support for an upload progress system, that monitors RFC1867 POST uploads as they are transmitted to upstream servers
nginx_modules_http_upstream_check - Add support for performing health check of upstream servers
nginx_modules_http_upstream_hash - Add support for distributing upstream requests based on hashed key value
nginx_modules_http_upstream_ip_hash - Add support for distributing upstream requests based on the IP-address of the client
nginx_modules_http_upstream_keepalive - Add support for caching connections to upstream servers
nginx_modules_http_upstream_least_conn - Add support for passing upstream requests to the server with the least number of active connections
nginx_modules_http_upstream_random - Add support for passing upstream requests to a randomly selected server
nginx_modules_http_upstream_sticky - Add support for session affinity, i.e. passing requests from the same client to the same same server in a group of servers
nginx_modules_http_upstream_zone - Add support for defining a shared memory zone that keeps the group's configuration and run-time state that are shared between worker processes
nginx_modules_http_userid - Add support for setting cookies suitable for client identification
nginx_modules_http_uwsgi - Add support for passing requests to a uwsgi server
nginx_modules_http_v2 - Add support for HTTP/2
nginx_modules_http_v3 - Add experimental support for HTTP/3
nginx_modules_http_vhost_traffic_status - Add support for providing access to virtual host status information
nginx_modules_http_vod - Add support for streaming video using DASH, HDS, HLS, MSS
nginx_modules_http_xslt - Add support for transforming XML responses using one or more XSLT stylesheets
nginx_modules_mail_imap - Add support for proxying IMAP messages
nginx_modules_mail_pop3 - Add support for proxying POP3 messages
nginx_modules_mail_smtp - Add support for proxying SMTP messages
nginx_modules_mail_ssl - Add SSL/TLS protocol support to a mail proxy server (implicit TLS, STARTTLS, etc.)
nginx_modules_stream_access - Add support for a simple host-based access control
nginx_modules_stream_geo - Add support for creating variables whose values depend on the client IP-address
nginx_modules_stream_geoip - Add support for creating variables whose values depend on the client IP-address, using the precompiled MaxMind databases
nginx_modules_stream_geoip2 - Add support for creating variables whose values depend on the client IP-address, using the precompiled MaxMind GeoIP2 databases
nginx_modules_stream_javascript - Add support for implementing location and variable handlers in njs - a subset of the JavaScript language
nginx_modules_stream_limit_conn - Add support for limiting the number of connections per a defined key, e.g. the number of connections from a single IP address
nginx_modules_stream_map - Add support for creating variables whose values depend on the values of other variables
nginx_modules_stream_pass - Add support for passing the accepted connection directly to any configured listening socket in "http", "stream", "mail", and other similar modules
nginx_modules_stream_realip - Add support for setting the client address and optional port to those sent in the specified header field (e.g. "X-Real-IP" or "X-Forwarded-For")
nginx_modules_stream_return - Add support for sending a specified value to the client and then closing the connection
nginx_modules_stream_set - Add support for setting a value for a variable
nginx_modules_stream_split_clients - Add support for creating variables suitable for A/B testing, also known as split testing
nginx_modules_stream_ssl - Add SSL/TLS protocol support to a stream proxy server
nginx_modules_stream_ssl_preread - Add support for extracting information from the ClientHello message without terminating SSL/TLS connection
nginx_modules_stream_upstream_hash - Add support for distributing upstream requests based on hashed key value
nginx_modules_stream_upstream_least_conn - Add support for passing upstream requests to the server with the least number of active connections
nginx_modules_stream_upstream_random - Add support for passing upstream requests to a randomly selected server
nginx_modules_stream_upstream_zone - Add support for defining a shared memory zone that keeps the group's configuration and run-time state that are shared between worker processes
nis - Support for NIS/YP services
nls - Add Native Language Support (using gettext - GNU locale utilities)
nntp - Add support for newsgroups (Network News Transfer Protocol)
nocd - Install all files required to run the application without a CD mounted
nsplugin - Build plugin for browsers supporting the Netscape plugin architecture (that is almost any modern browser)
nvenc - Add support for NVIDIA Encoder/Decoder (NVENC/NVDEC) API for hardware accelerated encoding and decoding on NVIDIA cards (requires x11-drivers/nvidia-drivers)
ocaml - Add support/bindings for the Ocaml language
ocamlopt - Enable ocamlopt support (ocaml native code compiler) -- Produces faster programs (Warning: you have to disable/enable it at a global scale)
oci8 - Add Oracle 8 Database Support
oci8-instant-client - Use dev-db/oracle-instantclient-basic as Oracle provider instead of requiring a full Oracle server install
odbc - Add ODBC Support (Open DataBase Connectivity)
ofed_drivers_cxgb3 - Chelsio T3 RNIC driver
ofed_drivers_cxgb4 - Chelsio T4 RNIC driver
ofed_drivers_ehca - IBM InfiniBand HCA (ehca) driver
ofed_drivers_ipath - QLogic InfiniPath HCA driver (verbs based)
ofed_drivers_mlx4 - Mellanox ConnectX InfiniBand HCA driver
ofed_drivers_mlx5 - Mellanox ConnectIB InfiniBand HCA driver
ofed_drivers_mthca - Mellanox InfiniBand HCA driver
ofed_drivers_nes - NetEffect Ethernet Server Cluster Adapter driver
ofed_drivers_ocrdma - Emulex OneConnect RDMA HCA driver
ofed_drivers_psm - QLogic InfiniPath HCA driver (psm based)
offensive - Enable potentially offensive items in packages
office_implementation_libreoffice - use the app-office/libreoffice{,-bin} implementation for extensions
ofx - Enable support for importing (and exporting) OFX (Open Financial eXchange) data files
ogg - Add support for the Ogg container format (commonly used by Vorbis, Theora and flac)
openal - Add support for the Open Audio Library
opencl - Enable OpenCL support (computation on GPU)
openexr - Support for the OpenEXR graphics file format
opengl - Add support for OpenGL (3D graphics)
openmp - Build support for the OpenMP (support parallel computing), requires >=sys-devel/gcc-4.2 built with USE="openmp"
openmpi_fabrics_knem - High-Performance Intra-Node MPI Communication
openmpi_fabrics_ofed - OFED RDMA stack (InfiniBand and iWARP)
openmpi_ofed_features_control-hdr-padding - Add padding bytes to the openib control header
openmpi_ofed_features_dynamic-sl - Enable openib BTL to query Subnet Manager for IB SL
openmpi_ofed_features_rdmacm - Enable Open Fabrics RDMACM support in openib BTL
openmpi_ofed_features_udcm - Enable Open Fabrics UDCM support in openib BTL
openmpi_rm_pbs - torque resource manager
openmpi_rm_slurm - slurm resource manager
opentype-compat - Convert BDF and PCF bitmap fonts to OTB wrapper format
opus - Enable Opus audio codec support
oracle - Enable Oracle Database support
orc - Use dev-lang/orc for just-in-time optimization of array operations
osc - Enable support for Open Sound Control
oss - Add support for OSS (Open Sound System)
otf - Install OpenType font versions
pam - Add support for PAM (Pluggable Authentication Modules) - DANGEROUS to arbitrarily flip
pch - Enable precompiled header support for faster compilation at the expense of disk space and memory
pcmcia - Add support for PCMCIA slots/devices found on laptop computers
pcre - Add support for Perl Compatible Regular Expressions
pda - Add support for portable devices
pdf - Add general support for PDF (Portable Document Format), this replaces the pdflib and cpdflib flags
perl - Add optional support/bindings for the Perl language
perl_features_debug - PERL_FEATURES setting enabling internal debug support in Perl
perl_features_ithreads - PERL_FEATURES setting enabling interpreter level threads, has some compatibility problems
perl_features_quadmath - PERL_FEATURES setting enabling 128bit floating point arithmetic via libquadmath
php - Include support for the PHP language
php_targets_php5-2 - Build against PHP 5.2
php_targets_php5-3 - Build against PHP 5.3
php_targets_php5-4 - Build against PHP 5.4
php_targets_php5-5 - Build against PHP 5.5
php_targets_php7-2 - Build against PHP 7.2
php_targets_php7-3 - Build against PHP 7.3
php_targets_php7-4 - Build against PHP 7.4
php_targets_php8-0 - Build against PHP 8.0
php_targets_php8-1 - Build against PHP 8.1
php_targets_php8-2 - Build against PHP 8.2
php_targets_php8-3 - Build against PHP 8.3
php_targets_php8-4 - Build against PHP 8.4
php_targets_php8-5 - Build against PHP 8.5
pie - Build programs as Position Independent Executables (a security hardening technique)
plasma - Build optional KDE plasma addons
plotutils - Add support for plotutils (library for 2-D vector graphics)
png - Add support for libpng (PNG images)
policykit - Enable PolicyKit (polkit) authentication support
portaudio - Add support for the crossplatform portaudio audio API
posix - Add support for POSIX-compatible functions
postgres - Add support for the postgresql database
postgres_targets_postgres10 - Build against PostgreSQL 10
postgres_targets_postgres11 - Build against PostgreSQL 11
postgres_targets_postgres12 - Build against PostgreSQL 12
postgres_targets_postgres13 - Build against PostgreSQL 13
postgres_targets_postgres14 - Build against PostgreSQL 14
postgres_targets_postgres15 - Build against PostgreSQL 15
postgres_targets_postgres16 - Build against PostgreSQL 16
postgres_targets_postgres17 - Build against PostgreSQL 17
postgres_targets_postgres18 - Build against PostgreSQL 18
postscript - Enable support for the PostScript language (often with ghostscript-gpl or libspectre)
ppds - Add support for automatically generated ppd (printing driver) files
prefix - Defines if a Gentoo Prefix offset installation is used
profile - Add support for software performance analysis (will likely vary from ebuild to ebuild)
pulseaudio - Add sound server support via media-libs/libpulse (may be PulseAudio or PipeWire)
python - Add optional support/bindings for the Python language
python_single_target_pypy3 - Build for PyPy3 only
python_single_target_pypy3_11 - Build for PyPy3.11 only
python_single_target_python2_7 - Build for Python 2.7 only
python_single_target_python3_10 - Build for Python 3.10 only
python_single_target_python3_11 - Build for Python 3.11 only
python_single_target_python3_12 - Build for Python 3.12 only
python_single_target_python3_13 - Build for Python 3.13 only
python_single_target_python3_13t - Build for Python 3.13 freethreading only
python_single_target_python3_14 - Build for Python 3.14 only
python_single_target_python3_14t - Build for Python 3.14 freethreading only
python_single_target_python3_3 - Build for Python 3.3 only
python_single_target_python3_4 - Build for Python 3.4 only
python_single_target_python3_6 - Build for Python 3.6 only
python_single_target_python3_7 - Build for Python 3.7 only
python_single_target_python3_8 - Build for Python 3.8 only
python_single_target_python3_9 - Build for Python 3.9 only
python_targets_pypy - Build with PyPy
python_targets_pypy3 - Build with PyPy3
python_targets_pypy3_11 - Build with PyPy3.11
python_targets_python2_7 - Build with Python 2.7
python_targets_python3_10 - Build with Python 3.10
python_targets_python3_11 - Build with Python 3.11
python_targets_python3_12 - Build with Python 3.12
python_targets_python3_13 - Build with Python 3.13
python_targets_python3_13t - Build with Python 3.13 freethreading
python_targets_python3_14 - Build with Python 3.14
python_targets_python3_14t - Build with Python 3.14 freethreading
python_targets_python3_3 - Build with Python 3.3
python_targets_python3_4 - Build with Python 3.4
python_targets_python3_5 - Build with Python 3.5
python_targets_python3_6 - Build with Python 3.6
python_targets_python3_7 - Build with Python 3.7
python_targets_python3_8 - Build with Python 3.8
python_targets_python3_9 - Build with Python 3.9
qdbm - Add support for the qdbm (Quick Database Manager) library
qemu_softmmu_targets_aarch64 - ARM64 system emulation target
qemu_softmmu_targets_alpha - system emulation target
qemu_softmmu_targets_arm - system emulation target
qemu_softmmu_targets_avr - system emulation target
qemu_softmmu_targets_cris - system emulation target
qemu_softmmu_targets_hppa - system emulation target
qemu_softmmu_targets_i386 - system emulation target
qemu_softmmu_targets_loongarch64 - system emulation target
qemu_softmmu_targets_m68k - system emulation target
qemu_softmmu_targets_microblaze - system emulation target
qemu_softmmu_targets_microblazeel - system emulation target
qemu_softmmu_targets_mips - system emulation target
qemu_softmmu_targets_mips64 - system emulation target
qemu_softmmu_targets_mips64el - system emulation target
qemu_softmmu_targets_mipsel - system emulation target
qemu_softmmu_targets_nios2 - system emulation target
qemu_softmmu_targets_or1k - OpenRISC system emulation target
qemu_softmmu_targets_ppc - system emulation target
qemu_softmmu_targets_ppc64 - system emulation target
qemu_softmmu_targets_riscv32 - system emulation target
qemu_softmmu_targets_riscv64 - system emulation target
qemu_softmmu_targets_rx - Renesas RX system emulation target
qemu_softmmu_targets_s390x - system emulation target
qemu_softmmu_targets_sh4 - system emulation target
qemu_softmmu_targets_sh4eb - system emulation target
qemu_softmmu_targets_sparc - system emulation target
qemu_softmmu_targets_sparc64 - system emulation target
qemu_softmmu_targets_tricore - system emulation target
qemu_softmmu_targets_x86_64 - system emulation target
qemu_softmmu_targets_xtensa - system emulation target
qemu_softmmu_targets_xtensaeb - system emulation target
qemu_user_targets_aarch64 - ARM64 userspace emulation target
qemu_user_targets_aarch64_be - ARM64 big endian userspace emulation target
qemu_user_targets_alpha - userspace emulation target
qemu_user_targets_arm - ARM (little endian) userspace emulation target
qemu_user_targets_armeb - ARM (big endian) userspace emulation target
qemu_user_targets_cris - userspace emulation target
qemu_user_targets_hexagon - Qualcomm hexagon userspace emulation target
qemu_user_targets_hppa - userspace emulation target
qemu_user_targets_i386 - userspace emulation target
qemu_user_targets_loongarch64 - userspace emulation target
qemu_user_targets_m68k - userspace emulation target
qemu_user_targets_microblaze - userspace emulation target
qemu_user_targets_microblazeel - userspace emulation target
qemu_user_targets_mips - userspace emulation target
qemu_user_targets_mips64 - userspace emulation target
qemu_user_targets_mips64el - userspace emulation target
qemu_user_targets_mipsel - userspace emulation target
qemu_user_targets_mipsn32 - MIPS N32 ABI userspace emulation target
qemu_user_targets_mipsn32el - MIPS N32 ABI LE userspace emulation target
qemu_user_targets_nios2 - userspace emulation target
qemu_user_targets_or1k - OpenRISC system emulation target
qemu_user_targets_ppc - PowerPC 32-bit big endian userspace emulation target
qemu_user_targets_ppc64 - PowerPC 64-bit big endian userspace emulation target
qemu_user_targets_ppc64le - PowerPC 64-bit little endian userspace emulation target
qemu_user_targets_riscv32 - userspace emulation target
qemu_user_targets_riscv64 - userspace emulation target
qemu_user_targets_s390x - userspace emulation target
qemu_user_targets_sh4 - userspace emulation target
qemu_user_targets_sh4eb - userspace emulation target
qemu_user_targets_sparc - userspace emulation target
qemu_user_targets_sparc32plus - userspace emulation target
qemu_user_targets_sparc64 - userspace emulation target
qemu_user_targets_x86_64 - userspace emulation target
qemu_user_targets_xtensa - userspace emulation target
qemu_user_targets_xtensaeb - userspace emulation target
qmail-spp - Add support for qmail SMTP plugins
qt4 - Add support for the Qt GUI/Application Toolkit version 4.x
qt5 - Add support for the Qt 5 application and UI framework
qt6 - Add support for the Qt 6 application and UI framework
quicktime - Add support for OpenQuickTime
radius - Add support for RADIUS authentication
raw - Add support for raw image formats
rdp - Enables RDP/Remote Desktop support
readline - Enable support for libreadline, a GNU line-editing library that almost everyone wants
recode - Enable support for the GNU recode library
ros_messages_cxx - Generate and install C++ messages.
ros_messages_eus - Generate and install EusLisp messages.
ros_messages_lisp - Generate and install Common-Lisp messages.
ros_messages_nodejs - Generate and install Nodejs messages.
ros_messages_python - Generate and install Python messages. The PYTHON_TARGETS variable controls the Python versions to build for.
rss - Enable support for RSS feeds
ruby - Add support/bindings for the Ruby language
ruby_targets_ruby24 - Build with MRI Ruby 2.4.x
ruby_targets_ruby25 - Build with MRI Ruby 2.5.x
ruby_targets_ruby26 - Build with MRI Ruby 2.6.x
ruby_targets_ruby27 - Build with MRI Ruby 2.7.x
ruby_targets_ruby30 - Build with MRI Ruby 3.0.x
ruby_targets_ruby31 - Build with MRI Ruby 3.1.x
ruby_targets_ruby32 - Build with MRI Ruby 3.2.x
ruby_targets_ruby33 - Build with MRI Ruby 3.3.x
ruby_targets_ruby34 - Build with MRI Ruby 3.4.x
ruby_targets_ruby40 - Build with MRI Ruby 4.0.x
rust_sysroots_bpf - Berkeley Packet Filter target
rust_sysroots_wasm - WebAssembly target
samba - Add support for SAMBA (Windows File and Printer sharing)
sane_backends_abaton - SANE_BACKENDS setting for building the abaton backend
sane_backends_agfafocus - SANE_BACKENDS setting for building the agfafocus backend
sane_backends_apple - SANE_BACKENDS setting for building the apple backend
sane_backends_artec - SANE_BACKENDS setting for building the artec backend
sane_backends_artec_eplus48u - SANE_BACKENDS setting for building the artec_eplus48u backend
sane_backends_as6e - SANE_BACKENDS setting for building the as6e backend
sane_backends_avision - SANE_BACKENDS setting for building the avision backend
sane_backends_bh - SANE_BACKENDS setting for building the bh backend
sane_backends_canon - SANE_BACKENDS setting for building the canon backend
sane_backends_canon630u - SANE_BACKENDS setting for building the canon630u backend
sane_backends_canon_dr - SANE_BACKENDS setting for building the canon_dr backend
sane_backends_canon_lide70 - SANE_BACKENDS setting for building the canon_lide70 backend
sane_backends_canon_pp - SANE_BACKENDS setting for building the canon_pp backend
sane_backends_cardscan - SANE_BACKENDS setting for building the cardscan backend
sane_backends_coolscan - SANE_BACKENDS setting for building the coolscan backend
sane_backends_coolscan2 - SANE_BACKENDS setting for building the coolscan2 backend
sane_backends_coolscan3 - SANE_BACKENDS setting for building the coolscan3 backend
sane_backends_dc210 - SANE_BACKENDS setting for building the dc210 backend
sane_backends_dc240 - SANE_BACKENDS setting for building the dc240 backend
sane_backends_dc25 - SANE_BACKENDS setting for building the dc25 backend
sane_backends_dell1600n_net - SANE_BACKENDS setting for building the dell1600n_net backend
sane_backends_dmc - SANE_BACKENDS setting for building the dmc backend
sane_backends_epjitsu - SANE_BACKENDS setting for building the epjitsu backend
sane_backends_epson - SANE_BACKENDS setting for building the epson backend
sane_backends_epson2 - SANE_BACKENDS setting for building the epson2 backend
sane_backends_epsonds - SANE_BACKENDS setting for building the epsonds backend
sane_backends_escl - SANE_BACKENDS setting for building the escl backend
sane_backends_fujitsu - SANE_BACKENDS setting for building the fujitsu backend
sane_backends_genesys - SANE_BACKENDS setting for building the genesys backend
sane_backends_gt68xx - SANE_BACKENDS setting for building the gt68xx backend
sane_backends_hp - SANE_BACKENDS setting for building the hp backend
sane_backends_hp3500 - SANE_BACKENDS setting for building the hp3500 backend
sane_backends_hp3900 - SANE_BACKENDS setting for building the hp3900 backend
sane_backends_hp4200 - SANE_BACKENDS setting for building the hp4200 backend
sane_backends_hp5400 - SANE_BACKENDS setting for building the hp5400 backend
sane_backends_hp5590 - SANE_BACKENDS setting for building the hp5590 backend
sane_backends_hpljm1005 - SANE_BACKENDS setting for building the hpljm1005 backend
sane_backends_hpsj5s - SANE_BACKENDS setting for building the hpsj5s backend
sane_backends_hs2p - SANE_BACKENDS setting for building the hs2p backend
sane_backends_ibm - SANE_BACKENDS setting for building the ibm backend
sane_backends_kodak - SANE_BACKENDS setting for building the kodak backend
sane_backends_kodakaio - SANE_BACKENDS setting for building the kodak backend
sane_backends_kvs1025 - SANE_BACKENDS setting for building the kvs1025 backend
sane_backends_kvs20xx - SANE_BACKENDS setting for building the kvs20xx backend
sane_backends_kvs40xx - SANE_BACKENDS setting for building the kvs20xx backend
sane_backends_leo - SANE_BACKENDS setting for building the leo backend
sane_backends_lexmark - SANE_BACKENDS setting for building the lexmark backend
sane_backends_ma1509 - SANE_BACKENDS setting for building the ma1509 backend
sane_backends_magicolor - SANE_BACKENDS setting for building the magicolor backend
sane_backends_matsushita - SANE_BACKENDS setting for building the matsushita backend
sane_backends_microtek - SANE_BACKENDS setting for building the microtek backend
sane_backends_microtek2 - SANE_BACKENDS setting for building the microtek2 backend
sane_backends_mustek - SANE_BACKENDS setting for building the mustek backend
sane_backends_mustek_pp - SANE_BACKENDS setting for building the mustek_pp backend
sane_backends_mustek_usb - SANE_BACKENDS setting for building the mustek_usb backend
sane_backends_mustek_usb2 - SANE_BACKENDS setting for building the mustek_usb2 backend
sane_backends_nec - SANE_BACKENDS setting for building the nec backend
sane_backends_net - SANE_BACKENDS setting for building the net backend
sane_backends_niash - SANE_BACKENDS setting for building the niash backend
sane_backends_p5 - SANE_BACKENDS setting for building the p5 backend
sane_backends_pie - SANE_BACKENDS setting for building the pie backend
sane_backends_pieusb - SANE_BACKENDS setting for building the pieusb backend
sane_backends_pixma - SANE_BACKENDS setting for building the pixma backend
sane_backends_plustek - SANE_BACKENDS setting for building the plustek backend
sane_backends_plustek_pp - SANE_BACKENDS setting for building the plustek_pp backend
sane_backends_pnm - SANE_BACKENDS settings for building the pnm test backend, considered a possible security risk
sane_backends_qcam - SANE_BACKENDS setting for building the qcam backend
sane_backends_ricoh - SANE_BACKENDS setting for building the ricoh backend
sane_backends_ricoh2 - SANE_BACKENDS setting for building the ricoh2 backend
sane_backends_rts8891 - SANE_BACKENDS setting for building the rts8891 backend
sane_backends_s9036 - SANE_BACKENDS setting for building the s9036 backend
sane_backends_sceptre - SANE_BACKENDS setting for building the sceptre backend
sane_backends_sharp - SANE_BACKENDS setting for building the sharp backend
sane_backends_sm3600 - SANE_BACKENDS setting for building the sm3600 backend
sane_backends_sm3840 - SANE_BACKENDS setting for building the sm3840 backend
sane_backends_snapscan - SANE_BACKENDS setting for building the snapscan backend
sane_backends_sp15c - SANE_BACKENDS setting for building the sp15c backend
sane_backends_st400 - SANE_BACKENDS setting for building the st400 backend
sane_backends_stv680 - SANE_BACKENDS setting for building the stv680 backend
sane_backends_tamarack - SANE_BACKENDS setting for building the tamarack backend
sane_backends_teco1 - SANE_BACKENDS setting for building the teco1 backend
sane_backends_teco2 - SANE_BACKENDS setting for building the teco2 backend
sane_backends_teco3 - SANE_BACKENDS setting for building the teco3 backend
sane_backends_test - SANE_BACKENDS setting for building the test backend
sane_backends_u12 - SANE_BACKENDS setting for building the u12 backend
sane_backends_umax - SANE_BACKENDS setting for building the umax backend
sane_backends_umax1220u - SANE_BACKENDS setting for building the umax1220u backend
sane_backends_umax_pp - SANE_BACKENDS setting for building the umax_pp backend
sane_backends_xerox_mfp - SANE_BACKENDS setting for building the xerox_mfp backend
sasl - Add support for the Simple Authentication and Security Layer
savedconfig - Use this to restore your config from /etc/portage/savedconfig ${CATEGORY}/${PN}. Make sure your USE flags allow for appropriate dependencies
scanner - Add support for scanner hardware (e.g. build the sane frontend in kdegraphics)
screencast - Enable support for remote desktop and screen cast using PipeWire
sctp - Support for Stream Control Transmission Protocol
sdl - Add support for Simple Direct Layer (media library)
seccomp - Enable seccomp (secure computing mode) to perform system call filtering at runtime to increase security of programs
secureboot - Automatically sign efi executables using user specified key
selinux - !!internal use only!! Security Enhanced Linux support, this must be set by the selinux profile or breakage will occur
selinux_policy_types_mcs - Multi-Category Security policy
selinux_policy_types_mls - Multi-Level Security policy
selinux_policy_types_strict - Strict policy
selinux_policy_types_targeted - Targeted policy
semantic-desktop - Cross-KDE support for semantic search and information retrieval
session - Add persistent session support
sid - Enable SID (Commodore 64 audio) file support
skey - Enable S/Key (Single use password) authentication support
slang - Add support for the slang text display library (it's like ncurses, but different)
smartcard - Enable smartcard support
smp - Enable support for multiprocessors or multicore systems
snappy - Enable support for Snappy compression (as implemented in app-arch/snappy)
sndfile - Add support for libsndfile
snmp - Add support for the Simple Network Management Protocol if available
soap - Add support for SOAP (Simple Object Access Protocol)
sockets - Add support for tcp/ip sockets
socks5 - Add support for the socks5 proxy
sound - Enable sound support
source - Zip the sources and install them
sox - Add support for Sound eXchange (SoX)
speech - Enable text-to-speech support
speex - Add support for the speex audio codec (used for speech)
spell - Add dictionary support
split-usr - Enable behavior to support maintaining /bin, /lib*, /sbin and /usr/sbin separately from /usr/bin and /usr/lib*
sqlite - Add support for sqlite - embedded sql database
ssl - Add support for SSL/TLS connections (Secure Socket Layer / Transport Layer Security)
startup-notification - Enable application startup event feedback mechanism
static - !!do not set this during bootstrap!! Causes binaries to be statically linked instead of dynamically
static-libs - Build static versions of dynamic libraries as well
strip - Allow symbol stripping to be performed by the ebuild for special files
subversion - Enable subversion (version control system) support
suid - Enable setuid root program(s)
svg - Add support for SVG (Scalable Vector Graphics)
svga - Add support for SVGAlib (graphics library)
symlink - Force kernel ebuilds to automatically update the /usr/src/linux symlink
syslog - Enable support for syslog
systemd - Enable use of systemd-specific libraries and features like socket activation or session tracking
szip - Use the szip compression library
taglib - Enable tagging support with taglib
tcl - Add support the Tcl language
tcmalloc - Use the dev-util/google-perftools libraries to replace the malloc() implementation with a possibly faster one
tcpd - Add support for TCP wrappers
telemetry - Send anonymized usage information to upstream so they can better understand our users
test - Enable dependencies and/or preparations necessary to run tests (usually controlled by FEATURES=test but can be toggled independently)
test-install - Install testsuite for manual execution by the user
test-rust - Enable important test dependencies that require Rust toolchain
theora - Add support for the Theora Video Compression Codec
threads - Add threads support for various packages. Usually pthreads
tidy - Add support for HTML Tidy
tiff - Add support for the TIFF image format
time64 - Use 64-bit time_t type instead of the regular 32-bit type. This flag is forced on time64 profiles, and masked elsewhere. It should be only used when detection of type width is not possible (e.g. for SRC_URI)
timidity - Build with Timidity++ (MIDI sequencer) support
tk - Add support for Tk GUI toolkit
truetype - Add support for FreeType and/or FreeType2 fonts
ttf - Install TrueType font versions
udev - Enable virtual/udev integration (device discovery, power and storage device support, etc)
udisks - Enable storage management support (automounting, volume monitoring, etc)
uefi - Enable support for the Unified Extensible Firmware Interface
unicode - Add support for Unicode
unwind - Add support for call stack unwinding and function name resolution
upnp - Enable UPnP port mapping support
upnp-av - Enable UPnP audio/video streaming support
upower - Enable power management support
usb - Add USB support to applications that have optional USB support (e.g. cups)
userland_BSD - USERLAND setting for systems using BSDish userland (FreeBSD OpenBSD NetBSD DragonFly)
userland_GNU - USERLAND setting for systems that use the GNU userland tools
uwsgi_plugins_alarm_curl - Plugin to send a logline to a curl url.
uwsgi_plugins_alarm_xmpp - Plugin to send a logline via XMPP/Jabber (see http://uwsgi-docs.readthedocs.org/en/latest/AlarmSubsystem.html).
uwsgi_plugins_cache - Enable the caching framework
uwsgi_plugins_carbon - Send uWSGI's internal statistics to one or more Carbon servers
uwsgi_plugins_cheaper_busyness - Implement cheaper algorithm that adds or remove workers based on average utilization for given time period
uwsgi_plugins_clock_monotonic - Modular clock source, uses clock_gettime with CLOCK_REALTIME
uwsgi_plugins_clock_realtime - Modular clock source, uses clock_gettime with CLOCK_MONOTONIC
uwsgi_plugins_corerouter - Base request routing internal mechanism
uwsgi_plugins_curl_cron - Call a curl url directly from a cron task
uwsgi_plugins_dumbloop - Run apps which do not require sockets
uwsgi_plugins_echo - Returns requests as they were sent
uwsgi_plugins_emperor_amqp - Enable an emperor controlled via AMQP
uwsgi_plugins_emperor_pg - Enable an emperor getting its configuration from a PostgreSQL database
uwsgi_plugins_emperor_zeromq - Enable an emperor controlled via ZeroMQ
uwsgi_plugins_fastrouter - Proxy/load-balancer/router speaking the uwsgi protocol
uwsgi_plugins_forkptyrouter - Pseudoterminal server to connect to instances running inside a jail/separate namespace
uwsgi_plugins_geoip - Export GeoIP information as routing variables (requires dev-libs/geoip)
uwsgi_plugins_graylog2 - Send logs to a Graylog2 server in Graylog2's native GELF format
uwsgi_plugins_http - make uWSGI natively speak HTTP, using this plugin you do not need a front-end HTTP server
uwsgi_plugins_ldap - Lets you configure the uWSGI server via LDAP
uwsgi_plugins_legion_cache_fetch - caching for the legion subsystem
uwsgi_plugins_logcrypto - Send encrypted log messages via UDP
uwsgi_plugins_logfile - Enable logging to logfiles (requires USE=ssl)
uwsgi_plugins_logpipe - Log to stdin of a newly forked process
uwsgi_plugins_logsocket - Log to a unix socket
uwsgi_plugins_mongodblog - Write logs to a mongodb server
uwsgi_plugins_nagios - To monitor, and eventually get warning messages, via Nagios
uwsgi_plugins_notfound - Log 404 errors
uwsgi_plugins_pam - Support PAM authentication
uwsgi_plugins_ping - pings a uwsgi server
uwsgi_plugins_rados - serve objects stored in a Ceph cluster directly using the librados API
uwsgi_plugins_rawrouter - Enable routing requests to a specific plugin/application/function using the request modifiers
uwsgi_plugins_redislog - Log to a redis server
uwsgi_plugins_router_access - uWSGI internal routing, simple access support
uwsgi_plugins_router_basicauth - uWSGI internal routing, basicauth support
uwsgi_plugins_router_cache - uWSGI internal routing, cache support
uwsgi_plugins_router_expires - uWSGI internal routing, expires headers support
uwsgi_plugins_router_hash - uWSGI internal routing, URL hash support
uwsgi_plugins_router_http - uWSGI internal routing, http headers support
uwsgi_plugins_router_memcached - uWSGI internal routing, memcached support
uwsgi_plugins_router_metrics - uWSGI internal routing, metrics subsystem support
uwsgi_plugins_router_radius - uWSGI internal routing, radius auth support
uwsgi_plugins_router_redirect - uWSGI internal routing, simple redirect support
uwsgi_plugins_router_redis - uWSGI internal routing, redis support
uwsgi_plugins_router_rewrite - uWSGI internal routing, URL rewrite support
uwsgi_plugins_router_spnego - uWSGI internal routing, spnego auth support
uwsgi_plugins_router_static - uWSGI internal routing, static files serving support
uwsgi_plugins_router_uwsgi - uWSGI internal routing,
uwsgi_plugins_router_xmldir - uWSGI internal routing,
uwsgi_plugins_rpc - Allow calling functions on a remote uWSGI server/cluster
uwsgi_plugins_rrdtool - Store uWSGI stats in a rrd fashion
uwsgi_plugins_rsyslog - Send logs to Unix standard syslog residing on a remote server
uwsgi_plugins_signal - Enable the signal framework to allow event based inter process communication
uwsgi_plugins_spooler - Enable queue management that works like a printing/mail system, available for python/perl/ruby
uwsgi_plugins_sqlite - Configure uWSGI via a sqlite database
uwsgi_plugins_ssi - Fast templating system that has access to the uWSGI API
uwsgi_plugins_sslrouter - Permits routing/proxy of SSL requests
uwsgi_plugins_stats_pusher_statsd - Part of the metrics subsystem, lets you push metrics to a statsd server
uwsgi_plugins_symcall - Allows you to write native uWSGI request handlers without the need of developing a full uWSGI plugin
uwsgi_plugins_syslog - Enable logging to standard Unix syslog
uwsgi_plugins_systemd_logger - Enable logging via systemd journal
uwsgi_plugins_transformation_chunked - Filter the response generated by your application, encode the output in HTTP chunked
uwsgi_plugins_transformation_gzip - Filter the response generated by your application, compress in gzip
uwsgi_plugins_transformation_offload - Filter the response generated by your application, buffer streaming offload
uwsgi_plugins_transformation_tofile - Filter the response generated by your application, caching buffer to a static file
uwsgi_plugins_transformation_toupper - Filter the response generated by your application, transforming each character in uppercase
uwsgi_plugins_tuntap - Ad-hoc solution for giving network connectivity to Linux processes running in a dedicated network namespace
uwsgi_plugins_ugreen - Use green threads on top of the uWSGI async platform
uwsgi_plugins_webdav - Build the WebDAV server (note: attributes are stored in extended attributes)
uwsgi_plugins_xattr - Exposes extended file attributes as router variables
uwsgi_plugins_xslt - Apply XSL transformation on XML documents on the fly (requires dev-libs/libxslt)
uwsgi_plugins_zabbix - Send statistics to a zabbix server (uwsgi behaves directly as a zabbix agent)
uwsgi_plugins_zergpool - Allow grouping zerg instances and attach them to different zerg servers
v4l - Enable support for video4linux (using linux-headers or userspace libv4l libraries)
vaapi - Enable Video Acceleration API for hardware decoding
vala - Enable bindings for dev-lang/vala
valgrind - Enable annotations for accuracy. May slow down runtime slightly. Safe to use even if not currently using dev-debug/valgrind
vanilla - Do not add extra patches which change default behaviour; DO NOT USE THIS ON A GLOBAL SCALE as the severity of the meaning changes drastically
vcd - Video CD support
vdpau - Enable the Video Decode and Presentation API for Unix acceleration interface
verify-provenance - Verify provenance of PyPI distfiles (verifies that the artifact comes from upstream source repository)
verify-sig - Verify upstream signatures on distfiles
vhosts - Add support for installing web-based applications into a virtual-hosting environment
video_cards_amdgpu - VIDEO_CARDS setting to build driver for AMDGPU video cards
video_cards_asahi - VIDEO_CARDS setting to build support for Apple AGX GPUs
video_cards_ast - VIDEO_CARDS setting to build driver for ASpeedTech video cards
video_cards_d3d12 - VIDEO_CARDS setting to build driver for Microsoft WSL video cards
video_cards_dummy - VIDEO_CARDS setting to build driver for dummy video cards
video_cards_exynos - VIDEO_CARDS setting to build driver for Samsung Exynos video cards
video_cards_fbdev - VIDEO_CARDS setting to build driver for fbdev video cards
video_cards_freedreno - VIDEO_CARDS setting to build reverse-engineered driver for Qualcomm Adreno cards
video_cards_geode - VIDEO_CARDS setting to build driver for AMD Geode GX and LX video cards
video_cards_i915 - VIDEO_CARDS setting to build driver for Intel i915 video cards
video_cards_i965 - VIDEO_CARDS setting to build driver for Intel i965 video cards
video_cards_imagination - VIDEO_CARDS setting to build driver for Imagination video cards
video_cards_intel - VIDEO_CARDS setting to build driver for Intel video cards
video_cards_lavapipe - VIDEO_CARDS setting to build Vulkan software rasterizer using LLVMpipe
video_cards_lima - VIDEO_CARDS setting to build driver for Mali 200/400 video cards
video_cards_mga - VIDEO_CARDS setting to build driver for mga video cards
video_cards_nouveau - VIDEO_CARDS setting to build reverse-engineered driver for nvidia cards
video_cards_nvidia - VIDEO_CARDS setting to build driver for nvidia video cards
video_cards_nvk - VIDEO_CARDS setting to build nouveau vulkan driver for nvidia cards (Turing and newer)
video_cards_omap - VIDEO_CARDS setting to build DRM driver for TI OMAP video cards
video_cards_panfrost - VIDEO_CARDS setting to build driver for Mali 600/700/800 video cards
video_cards_panthor - VIDEO_CARDS setting to support for Mali 10th video cards
video_cards_qxl - VIDEO_CARDS setting to build driver for qxl (QEMU virtual GPU)
video_cards_r100 - VIDEO_CARDS setting to build only r100 based chips code for radeon
video_cards_r128 - VIDEO_CARDS setting to build driver for ATI r128 video cards
video_cards_r200 - VIDEO_CARDS setting to build only r200 based chips code for radeon
video_cards_r300 - VIDEO_CARDS setting to build only r300, r400 and r500 based chips code for radeon
video_cards_r600 - VIDEO_CARDS setting to build only r600, r700, Evergreen and Northern Islands based chips code for radeon
video_cards_radeon - VIDEO_CARDS setting to build driver for ATI radeon video cards
video_cards_radeonsi - VIDEO_CARDS setting to build only Southern Islands based chips code for radeon
video_cards_siliconmotion - VIDEO_CARDS setting to build driver for siliconmotion video cards
video_cards_tegra - VIDEO_CARDS setting to build driver for tegra video cards
video_cards_v3d - VIDEO_CARDS setting to build driver for v3d video cards
video_cards_vc4 - VIDEO_CARDS setting to build driver for vc4 video cards
video_cards_vesa - VIDEO_CARDS setting to build driver for vesa video cards
video_cards_via - VIDEO_CARDS setting to build driver for via video cards
video_cards_virgl - VIDEO_CARDS setting to build driver for virgil (virtual 3D GPU)
video_cards_virtualbox - VIDEO_CARDS setting to build driver for virtualbox emulation
video_cards_vivante - VIDEO_CARDS setting to build etnaviv driver for vivante video cards
video_cards_vmware - VIDEO_CARDS setting to build driver for vmware video cards
video_cards_zink - VIDEO_CARDS setting to build Zink OpenGL-over-Vulkan Gallium driver
videos - Install optional video files (used in some games)
vim-syntax - Pulls in related vim syntax scripts
vnc - Enable VNC (remote desktop viewer) support
voicemail_storage_file - Uses plain files to store configuration & messages.
voicemail_storage_imap - Uses an IMAP server to store configuration & messages.
voicemail_storage_odbc - Uses ODBC to talk to a SQL database backend.
vorbis - Add support for the OggVorbis audio codec
vpx - Add support for VP8/VP9 codecs (usually via media-libs/libvpx)
vulkan - Add support for 3D graphics and computing via the Vulkan cross-platform API
wavpack - Add support for wavpack audio compression tools
wayland - Enable dev-libs/wayland backend
webkit - Add support for the WebKit HTML rendering/layout engine
webp - Add support for the WebP image format
wifi - Enable wireless network functions
wmf - Add support for the Windows Metafile vector image format
wxwidgets - Add support for wxWidgets/wxGTK GUI toolkit
X - Add support for X11
x264 - Enable H.264 encoding using x264
xattr - Add support for extended attributes (filesystem-stored metadata)
Xaw3d - Add support for the 3d athena widget set
xcb - Support the X C-language Binding, a replacement for Xlib
xcomposite - Enable support for the Xorg composite extension
xemacs - Add support for XEmacs
xface - Add xface support used to allow a small image of xface format to be included in an email via the header 'X-Face'
xft - Build with support for XFT font renderer (x11-libs/libXft)
xine - Add support for the XINE movie libraries
xinerama - Add support for querying multi-monitor screen geometry through the Xinerama API
xinetd - Add support for the xinetd super-server
xml - Add support for XML files
xmlrpc - Support for xml-rpc library
xmp - Enable support for Extensible Metadata Platform (Adobe XMP)
xmpp - Enable support for Extensible Messaging and Presence Protocol (XMPP) formerly known as Jabber
xosd - Sends display using the X On Screen Display library
xpm - Add support for XPM graphics format
xscreensaver - Add support for XScreenSaver extension
xtables_addons_account - ACCOUNT target is a high performance accounting system for large local networks
xtables_addons_asn - match a packet by its source or destination Autonomous System Number
xtables_addons_chaos - CHAOS target causes confusion on the other end by doing odd things with incoming packets
xtables_addons_condition - matches if a specific condition variable is (un)set
xtables_addons_delude - DELUDE target will reply to a SYN packet with SYN-ACK, and to all other packets with an RST
xtables_addons_dhcpmac - DHCPMAC target/match in conjunction with ebtables can be used to completely change all MAC addresses from and to a VMware-based virtual machine
xtables_addons_dnetmap - DNETMAP target allows dynamic two-way 1:1 mapping of IPv4 subnets
xtables_addons_echo - ECHO target sends back all packets it received
xtables_addons_fuzzy - matches a rate limit based on a fuzzy logic controller (FLC)
xtables_addons_geoip - match a packet by its source or destination country
xtables_addons_gradm - match packets based on grsecurity RBAC status
xtables_addons_iface - match allows to check interface states
xtables_addons_ipmark - IPMARK target allows mark a received packet basing on its IP address
xtables_addons_ipp2p - matches certain packets in P2P flows
xtables_addons_ipv4options - match against a set of IPv4 header options
xtables_addons_length2 - matches the length of a packet against a specific value or range of values
xtables_addons_logmark - LOGMARK target will log packet and connection marks to syslog
xtables_addons_lscan - match detects simple low-level scan attemps based upon the packet's contents
xtables_addons_pknock - match implements so-called "port knocking", a stealthy system for network authentication
xtables_addons_proto - modifies the protocol number in IP packet header
xtables_addons_psd - match attempts to detect TCP and UDP port scans (derived from Solar Designer's scanlogd)
xtables_addons_quota2 - match implements a named counter which can be increased or decreased on a per-match basis
xtables_addons_sysrq - SYSRQ target allows to remotely trigger sysrq on the local machine over the network
xtables_addons_tarpit - TARPIT target captures and holds incoming TCP connections using no local per-connection resources
xv - Add in optional support for the Xvideo extension (an X API for video playback)
xvid - Add support for xvid.org's open-source mpeg-4 codec
zeroconf - Support for DNS Service Discovery (DNS-SD)
zip - Enable support for ZIP archives
zlib - Add support for zlib compression
zsh-completion - Enable zsh completion support
zstd - Enable support for ZSTD compression

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