Global USE flags

Flag Description Packages
curl 2
debug 6
doc 3
examples 6
mysql 2
openmp 2
pam 2
perl 3
python 3
static-libs 7
test 4

Local USE flags

app-crypt

libb2

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

app-emulation

bst

Flag Description
man

dev-embedded

sdcc

Flag Description
${REQUIRED_USE}
${SDCC_PORTS}
avr Add support for AVR -- not supported upstream
boehm-gc Enable Hans Boehm's garbage collector <pkg>dev-libs/boehm-gc</pkg>
device-lib Enable built of devices libraries
ds390 Add support for Dallas DS390
ds400 Add support for Dallas DS400
ez80-z80 Add support for EZ80-Z80
gbz80 Add support for Gameboy gbz80
hc08 Add support for Freescale/Motorola HC08 based
mcs51 Add support for Intel mcs51
non-free Enable non-free runtime library parts
packihx Enable Intel HEX files pack utility
pdk13 Add support for PDK13
pdk14 Add support for PDK14
pdk15 Add support for PDK15
pdk16 Add support for PDK16
pic14 Add support for Microchip 14 bits PICs
pic16 Add support for Microchip 16 bits PICs
r2k Add support for Rabbit 2000
r3ka Add support for Rabbit 3000A
s08 Add support for Freescale/Motorola S08
sdbinutils Enable SDCC library archive utilities sdar, sdranlib, sdnm
sdcdb Enable SDCC source level debugger
sdcpp Enable SDCC preprocessor based on GCC cpp
stm8 Add support for STMicroelectronics STM8
tlcs90 Add support for TLCS-90
ucsim Enable software simulator for microcontrollers
z180 Add support for Zilog Z180
z80 Add support for Zilog Z80

dev-libs

libcasc

Flag Description
system-libtomcrypt Use the system-wide <pkg>dev-libs/libtomcrypt</pkg>instead of bundled.

pocl

Flag Description
accel Enable the generic hardware accelerator device driver
conformance Ensures that certain build options which would result in non-conformant pocl build stay disabled. Note that this does not quarantee a fully conformant build of pocl.
cuda Enable the CUDA backend for NVIDIA GPUs
float-conversion When enabled, OpenCL printf() call's f/e/g formatters are handled by pocl. When disabled, these are handled by system C library.
hardening Enable hardening against various attacks. May worsen performance
hwloc Enable hwloc support
lto Adds support for link time optimization
memmanager Enables custom memory manager. Except for special circumstances, this should be disabled

xmlrpc-c

Flag Description
abyss Build the Abyss mini web-server.
cgi
cxx
libxml2 Use <pkg>dev-libs/libxml2</pkg> to parse XML instead of the internal expat library.
threads Controls whether to build the Abyss web-server with pthreads or fork 'threading'.
tools Build tools like 'xmlrpc'.

media-sound

rotter

Flag Description
mp3
sndfile
twolame Enables twolame support (MPEG Audio Layer 2 encoder)

net-analyzer

hsflowd

Flag Description
docker Enable docker support
nflog Enable nflog support via net-libs/libnetfilter_log
openvswitch Enable openvswitch support
pcap Add support for network packet capture via net-libs/libpcap

sys-auth

nss-pam-ldapd

Flag Description
kerberos
pynslcd Install the python implementation along with the standard implementation
sasl
selinux
utils Install the command-line utilities

sys-cluster

ganglia

Flag Description
minimal
pcre

ganglia-web

Flag Description
vhosts

slurm

Flag Description
X
hdf5
html Build html documentation
ipmi Build support for collecting some ipmi stats
json Add support for json-persing via json-c
lua
multiple-slurmd Allow multiple slurmd to run
munge Enable authentication via munge
netloc Add support for netloc (amd64 only)
numa Add NUMA awareness
nvml Enable the NVML device discovery
ofed Add Infiniband support via ofed
rrdtool Enable rrdtool support
slurmdbd Install SQL server for slurmdbd
slurmrestd Build slurmrestd
torque Enable perl scripts that emulates pbs (qstat, qsub etc.)
ucx Enable Unified Communication X library support
yaml Add support for yaml

www-apps

nextcloud

Flag Description
imagemagick
postgres
sqlite

x11-misc

x11vnc

Flag Description
crypt
fbcon
ssl
xcomposite
xdamage Enable support for the Xdamage library
xfixes Enable support for the Xfixes library
xinerama
xrandr Enable support for the X xrandr extension
zeroconf