Gentoo Packages

Global USE flags

Flag Description Packages
"${IUSE_TARGETS[@]/amdgpu_targets_/amdgpu_targets_}" 2
"( 4
( 8
) 6
)" 4
X Build the XCB platform plugin and enable X11 integration 8
audio Pull <pkg>sci-ml/torchaudio</pkg> for the audio nodes (audio encoders, audio VAE). torchaudio must match your installed <pkg>sci-ml/pytorch</pkg> — it currently lags the 2.12 stack, so this may not resolve yet 2
avahi Build with <pkg>net-dns/avahi</pkg>:3 2
avif 2
cli Install the optional MCP CLI (pulls dev-python/typer + python-dotenv) 3
cpu_flags_x86_avx 2
cpu_flags_x86_sse2 2
cuda Enable NVIDIA Cuda computations support (Experimental!) 18
cudnn Enable support for nVidia cuDNN library 2
cups 3
cusparselt Enable support for nVidia cuSPARSELt library 2
dbus Build bindings for the QtDBus module 5
debug Enables debug messages 16
designer Build QtDesigner and QtUiTools modules 3
doc Install doxygen documentation 39
examples Pull in <pkg>dev-python/jupyter</pkg> to run the bundled starter notebooks 16
extra Add support for extra TeXLive packages 2
ffmpeg Enable audio transcoding via media-video/ffmpeg (allows non-WAV input) 3
gfx1100 2
gfx1101 2
gfx1103 2
gfx1150 2
gfx1151 2
gfx1200 2
gfx1201 2
gfx908 2
gfx90a 2
gfx942 3
gfx950 3
gles2-only Build QtGui "QOpenGL*" classes 8
gphoto2 2
gpu Enable support for CUDA with <pkg>dev-util/nvidia-cuda-toolkit</pkg> 2
gstreamer Enable <pkg>media-libs/gstreamer</pkg> support 3
gtk Build the GTK platform theme plugin 4
gtk3 Enable <pkg>x11-libs/gtk+</pkg>:3 support 12
gui Build QtGui module 9
hdf5 Support the standard representation (HDF5) 4
hip Build a HIP (ROCm) backend 2
image Pull in media-libs/opencv for image-tokenization support (mistral_common[image] extra) 3
introspection Generate GObject Introspection .gir/.typelib files so Gwyddion's libraries can be consumed from bindings (Python, JavaScript, Vala). Required for USE=python. 2
java Build the Java bindings 4
jpeg 3
jpeg2k 3
jpegxl Enable JPEG XL image format support via <pkg>media-libs/libjxl</pkg> 2
json Enable the JSON API of Fossil's wiki 2
keyring 2
l10n_ 3
lapack 2
libnotify Enable desktop notifications support 2
luajittex Add support for LuaJitTeX: LuaTeX based on LuaJIT which is usually faster. 2
mcp Install the Model Context Protocol server (<pkg>dev-python/mcp</pkg>) 2
mkl Use <pkg>sci-libs/mkl</pkg> for blas, lapack and sparse blas routines 2
nls 3
numa Enable NUMA support using <pkg>sys-process/numactl</pkg> (NUMA kernel support is also required) 2
numpy Build with support for <pkg>dev-python/numpy</pkg> 5
ocamlopt 5
openblas Build an OpenBLAS backend 3
opencl Build vendored OpenCL runtime 11
openexr 4
opengl Build bindings for the QtOpenGL module 7
openmp Use OpenMP for parallel code 9
openrc Install OpenRC init.d/conf.d files for a supervise-daemon-managed service 6
openssl Use <pkg>dev-libs/openssl</pkg> as TLS backend 2
png 4
profiler Install the NVIDIA CUDA profiler (nvprof) and the related libraries 2
python Build SWIG bindings for Python 10
qml Build QtQml module 5
qt5 Build against Qt5 (matches upstream sources). 4
qt6 Build against Qt6 via a local port patch. 6
rocm Build for AMD ROCm inference (VLLM_TARGET_DEVICE=rocm); pull HIP libs + torch{audio,vision} 8
roctracer Enable roctracer (roctx) marker 5
sdl Enable video output of dec265 via <pkg>media-libs/libsdl2</pkg> 3
source 4
spell 2
ssl 4
static-libs 7
systemd Install a systemd service unit (qdrant.service) 6
test Build and run unit tests 72
tiff Enable TIFF image support via <pkg>dev-python/tifffile</pkg> 5
tk 2
tools Build PySide Tools 3
udev 2
ui Build and embed the Svelte web UI (pulls <pkg>net-libs/nodejs</pkg>; runs npm at build time, requires network access during compile). 2
vulkan Enable Vulkan GPU backend 10
wayland Provide <pkg>dev-qt/qtwayland</pkg> to ensure Qt applications can be run as Wayland clients 4
webp Enable WebP image export via <pkg>media-libs/libwebp</pkg> 6
webui Build the embedded llama-server web UI. Fetches prebuilt assets from the upstream Hugging Face bucket at configure time; disable for a server binary with only the HTTP API. 2
widgets Build bindings for the QtWidgets module 7
xml Build QtXml module 5

Category USE flags

app-portage

Flag Description Packages
bash-completion Install the bash-completion script for the <pkg>app-shells/bash-completion</pkg> framework. 2
zsh-completion Install the zsh completion function (_portconf) into <pkg>app-shells/zsh</pkg>'s site-functions directory. 2

app-text

Flag Description Packages
xetex Add support for XeTeX macros (<pkg>dev-texlive/texlive-xetex</pkg>) 2

dev-python

Flag Description Packages
bluetooth Build QtBluetooth module 2
help Build QtHelp module 2
multimedia Build bindings for the QtMultimedia module 3
network Build bindings for the QtNetwork module 3
nfc Build QtNfc module 2
pdfium Build QtPdf module 2
positioning Build QtPositioning module 2
printsupport Build bindings for the QtPrintSupport module 3
pyqt6 To install required libraries for pyqt6 support 3
pyside To install required libraries for pyside support 2
python_targets_python2_7 Enable Python-compatible libs (python2_7 only) 8
quick Build QtQuick and QtQuickWidgets modules 2
quick3d Build QtQuick3D and QtQuickWidgets modules 2
remoteobjects Pull in bindings for the QtRemoteObjects module 2
scxml Pull in bindings for the QtScXml module 2
sensors Build QtSensors module 2
serialport Pull in bindings for the QtSerialPort module 2
spatialaudio Pull in bindings for the QtSpatialAudio module 2
speech Build QtTextToSpeech module 2
speed To install optional libraries that speed up some functionalities 2
sql Build QtSql module 3
svg Build bindings for the QtSvg module 3
testlib Build bindings for the QtTest module 3
webchannel Build QtWebChannel module 2
webengine Build QtWebEngine and QtWebEngineWidgets modules 2
websockets Build QtWebSockets module 2
wx To install required libraries for wx support 2

media-gfx

Flag Description Packages
heif Enable HEIF/HEIC image support via <pkg>media-libs/libheif</pkg> 2

media-libs

Flag Description Packages
cpu_flags_arm_neon 2
xine 2

media-plugins

Flag Description Packages
gtk2 Build the GTK2 variant of the plugin 10

sci-libs

Flag Description Packages
benchmark Build and install benchmark binaries 11
fortran 2
hipblaslt Use <pkg>sci-libs/hipBLASLt</pkg> for some non-batched and strided batched problems 2
sparse Build hipSOLVER with sparse functionality (<pkg>sci-libs/cholmod</pkg>) 2

sci-misc

Flag Description Packages
avx 2
avx2 2
avx512f 2
avx512vbmi 2
blis Build a BLIS backend 2
bmi2 2
f16c 2
flexiblas Build a FlexiBLAS backend 2
fma3 2
sse4_2 2
wmma Use rocWMMA to enhance flash attention performance 2

sci-ml

Flag Description Packages
api Install FastAPI / uvicorn HTTP-server bindings (gaia.api) 2
torch Enable PyTorch integration (safetensors model loading) 2

sci-visualization

Flag Description Packages
bzip2 2
fits Enable FITS image import via <pkg>sci-libs/cfitsio</pkg> 2
sourceview Enable support for <pkg>x11-libs/gtksourceview</pkg> 2

Local USE flags

app-accessibility

whisper-cpp

Flag Description
blas Enable OpenBLAS-accelerated matrix operations via the BLAS backend
sdl2 Build and install example applications that use media-libs/libsdl2

app-text

mupdf

Flag Description
archive Enable support for CBR and other archive formats using libarchive
barcode Enable support for barcode detection/generation for mutool using zxingcpp
brotli
javascript

texlive

Flag Description
${IUSE}
context Add support for the ConTeXt format (<pkg>dev-texlive/texlive-context</pkg>)
games Add typesetting support for games (chess, etc.) (<pkg>dev-texlive/texlive-games</pkg>)
graphics Add support for several graphics packages (pgf, tikz,...)
humanities Add LaTeX support for the humanities (<pkg>dev-texlive/texlive-humanities</pkg>)
l10n_${X}
luatex Install TeX Live packages that require luatex
metapost Add support for metapost: A tool for creating graphics in scalable PostScript
music Add support for music typesetting (<pkg>dev-texlive/texlive-music</pkg>)
pdfannotextractor Add <pkg>dev-tex/pdfannotextractor</pkg> support, for extracting annotations from PDF files
pstricks Add pstricks packages (<pkg>dev-texlive/texlive-pstricks</pkg>)
publishers Add support for publishers (<pkg>dev-texlive/texlive-publishers</pkg>)
science Add typesetting support for natural and computer sciences (<pkg>dev-texlive/texlive-mathscience</pkg>)
tex4ht Add support for <pkg>dev-tex/tex4ht</pkg> (for converting (La)TeX to (X)HTML, XML and OO.org)
texi2html Add support for <pkg>app-text/texi2html</pkg> which converts texi files to HTML

texlive-core

Flag Description
cjk
xindy Add support for Xindy: A general-purpose index processor.

dev-libs

blingbling

Flag Description
vicious Require vicious plugin

libstrophe

Flag Description
expat Use dev-libs/expat instead of dev-libs/libxml2 to parse XML
gnutls

ptexenc

Flag Description
iconv

xdna-driver

Flag Description
compress-xz Compress firmware using xz (<pkg>app-arch/xz-utils</pkg>) before installation
compress-zstd Compress firmware using zstd (<pkg>app-arch/zstd</pkg>) before installation

dev-python

SciFiReaders

Flag Description
hyperspy Enable the HyperSpy converter (<pkg>dev-python/hyperspy</pkg>)
nsid Enable the pyNSID reader backend (<pkg>dev-python/pyNSID</pkg>)

euphonic

Flag Description
matplotlib Enable matplotlib-based plotting helpers
phonopy-reader Enable reading of phonopy HDF5/YAML output

hyperspy

Flag Description
gui-jupyter To install required libraries to use the Jupyter widgets GUI elements
gui-traitsui To install required libraries to use the GUI elements based on traitsui
learning To install required libraries for some machine learning features
mrcz To install the mrcz plugin

mkdocs

Flag Description
i18n Enable internationalization support via <pkg>dev-python/babel</pkg>

mpire

Flag Description
dashboard Pull in dev-python/flask for the optional dashboard webapp under mpire/dashboard/
dill Pull in dev-python/multiprocess so the dill-based fork backend in mpire/context.py is usable

numba

Flag Description
threads

pygobject

Flag Description
libffi

pylops

Flag Description
advanced Enable advanced numerical backends (llvmlite, numba, pyfftw, pywavelets) for faster/large-scale operators

pyqt5

Flag Description
declarative Build bindings for the QtQml and QtQuick modules and enable the qmlscene plugin
x11extras Build bindings for the QtX11Extras module

pyside

Flag Description
${!QT_MODULES[*]}
3d Build Qt3DCore, Qt3DAnimation, Qt3DExtras, Qt3DInput, Qt3DLogic, and Qt3DRender modules
charts Build QtCharts module
concurrent Build QtConcurrent module
core Build QtCore module, if disable then only shiboken will be built
datavis Build QtDataVisualization module (deprecated upstream as of Qt 6.6 in favour of QtGraphs; resurrected for sci-physics/sasview)
graphs Build QtGraphs and QtGraphsWidgets modules (the modern successor to QtDataVisualization)
httpserver Build QtHttpServer module
location Build QtLocation module
network-auth Build QtNetworkAuth module
serialbus Build QtSerialBus modules
uitools Build UITools module
webview Build QtWebView module

qtpy

Flag Description
pyqt5 Use <pkg>dev-python/pyqt5</pkg> as a Qt for Python implementation. Required for sci-physics/mantid and other Qt5-only consumers; disabled by default in ::gentoo (Qt5 deprecation policy). Set QT_API=pyqt5 at runtime to select it explicitly.
pyside6 Use <pkg>dev-python/pyside</pkg> as Qt for Python implementation

rosettasciio

Flag Description
zspy Enable ZSpy (Zarr v2-based) reader/writer

silx

Flag Description
h5pyd Pull in dev-python/h5pyd so silx.io.h5py_utils can browse remote HSDS-served HDF5 datasets

traitsui

Flag Description
demo To install all requirements demo

vllm

Flag Description
cpu Build for CPU inference (VLLM_TARGET_DEVICE=cpu); pull torchaudio + numba
humming Pull dev-python/humming-kernels for the optional CUDA-only "humming" MXFP4 quantization backend (needs USE=cuda)
rust Build the optional vllm-rs Rust serving frontend (opt-in at runtime via VLLM_USE_RUST_FRONTEND=1)

dev-qt

qtcore

Flag Description
icu
old-kernel Disable syscalls not available on Linux kernels older than 4.11

qtdeclarative

Flag Description
jit
localstorage Build the LocalStorage import for QtQuick (requires QtSql)

qtgui

Flag Description
accessibility
egl
eglfs Build the EGL Full Screen/Single Surface platform plugin
evdev Enable support for input devices via evdev
ibus Build the IBus input method plugin
libinput Enable support for input devices via <pkg>dev-libs/libinput</pkg>
linuxfb Enable Linux framebuffer support for embedded devices
tslib Enable support for touchscreen devices via <pkg>x11-libs/tslib</pkg>
tuio Build plugin to receive touch events over the TUIO protocol
vnc

qtmultimedia

Flag Description
alsa
openal
pulseaudio

qtnetwork

Flag Description
gssapi Enable support for GSSAPI (<pkg>virtual/krb5</pkg>)
libproxy Use <pkg>net-libs/libproxy</pkg> for automatic HTTP/SOCKS proxy configuration
sctp

qtsql

Flag Description
freetds
mysql
oci8
odbc
postgres
sqlite

qtwayland

Flag Description
compositor Enable support for the wayland compositor / server APIs

dev-tex

biblatex

Flag Description
biber Install the unicode compatible backend processor

dev-util

hip

Flag Description
video_cards_amdgpu Build for AMD platform
video_cards_nvidia Build for Nvidia platform

nvidia-cuda-toolkit

Flag Description
debugger Install the CUDA debugger
rdma Enable infiniband support via <pkg>sys-cluster/rdma-core</pkg>
sanitizer Install compute-sanitizer tool

therock-bin

Flag Description
gfx1030
gfx1102
gfx1152
gfx1153

dev-vcs

fossil

Flag Description
fusefs Enable the Fuse Filesystem
static
system-sqlite Use the system SQLite instead of the bundled one
tcl
tcl-private-stubs Enable Tcl integration via private stubs mechanism
tcl-stubs Enable Tcl integration via stubs library mechanism
th1-docs Enable TH1 for embedded documentation pages
th1-hooks Enable TH1 hooks for commands and web pages

media-gfx

comfyui

Flag Description
compile Pull <pkg>dev-python/triton-bin</pkg> for torch.compile / inductor custom nodes and comfy_kitchen's Triton backend
templates Install the bundled example-workflow template gallery (<pkg>dev-python/comfyui-workflow-templates</pkg>; ~330 MiB of preview assets)

comfyui-if-trellis

Flag Description
mesh Pull the mesh (.glb) export stack (<pkg>dev-python/xatlas</pkg>, <pkg>dev-python/pyvista</pkg>, <pkg>dev-python/python-igraph</pkg>, <pkg>dev-python/pymeshfix</pkg>; pyvista drags in <pkg>sci-libs/vtk</pkg>). Without it only Gaussian .ply output works.

darktable

Flag Description
ai Build the optional AI subsystem (neural restore, AI object mask) using the system <pkg>sci-libs/onnxruntime</pkg> for inference
colord
cpu_flags_x86_sse3
gamepad Support using game controllers as input devices
geolocation Enable geotagging support
graphicsmagick
kwallet Enable encrypted storage of passwords with <pkg>kde-frameworks/kwallet</pkg>
l10n_cs
l10n_de
l10n_es
l10n_fi
l10n_fr
l10n_hu
l10n_ja
l10n_nb
l10n_nl
l10n_pl
l10n_pt-BR
l10n_ru
l10n_sl
l10n_sq
l10n_sv
l10n_uk
l10n_zh-CN
l10n_zh-TW
lto Enable link-time optimisations in the RawSpeed library
lua
midi Support using MIDI input devices such as Behringer X-Touch Mini, Arturia Beatstep or Korg nanoKONTROL2, as input devices

viu

Flag Description
icy-sixel Enable sixel graphics output via pure-Rust icy_sixel backend
sixel Enable sixel graphics output via media-libs/libsixel

media-libs

libde265

Flag Description
dec265 Enable build of the dec265 example decoder program
enc265 Enable build of the enc265 example encoder program; live ebuild only, upstream strips this directory from release tarballs

mlt

Flag Description
frei0r Build the module for <pkg>media-plugins/frei0r-plugins</pkg>
jack
libsamplerate
opencv Enable image processing via <pkg>media-libs/opencv</pkg>
rtaudio Builds rtaudio consumer for native audio support on multiple platforms.
rubberband Enable pitch/time stretching via <pkg>media-libs/rubberband</pkg>
vdpau
vidstab Enable video stabilization via <pkg>media-libs/vidstab</pkg>
vorbis

opencv

Flag Description
abi_x86_32
atlas Use <pkg>sci-libs/atlas</pkg> for blas, lapack and sparse blas routines (Experimental!)
contrib Install user contributed modules from opencv_contrib (Experimental!); in 5.x this also provides the ml (cv2.ml) and gapi (G-API) modules, which upstream moved out of the main repository
contribcvv Enable CVV in contrib
contribdnn Enable DNN module
contribfreetype Enable Drawing UTF-8 strings with <pkg>media-libs/freetype</pkg>&amp;<pkg>media-libs/harfbuzz</pkg>
contribhdf Enable HDF module (requires <pkg>sci-libs/hdf5</pkg>)
contribovis Enable OGRE vision module support (<pkg>dev-games/ogre</pkg>)
contribsfm Enable SFM module (requires USE="eigen gflags glog")
contribxfeatures2d Enables xfeatures2d and autodownload of samples in contrib
cpu_flags_x86_avx512_4fmaps
cpu_flags_x86_avx512_4vnniw
cpu_flags_x86_avx512er
cpu_flags_x86_avx512pf
cpu_flags_x86_f16c
cpu_flags_x86_sse
eigen Enable usage of <pkg>dev-cpp/eigen</pkg> for computations
features Enable the features module (the renamed features2d module in 5.x)
features2d Enable features2d module
gdal Enable support for <pkg>sci-libs/gdal</pkg> library
gflags Use Google's C++ argument parsing library (<pkg>dev-cpp/gflags</pkg>)
gif
glog Use Google's C++ logging library (<pkg>dev-cpp/glog</pkg>)
ieee1394
jasper Use <pkg>media-libs/jasper</pkg> for jpeg2k support
non-free Enable non-free components
opencvapps Enable compilation with opencvapps
openni Adds support for Kinect-like 3D sensors devices with <pkg>dev-libs/OpenNI</pkg>
openni2 Adds support for Kinect-like 3D sensors devices with <pkg>dev-libs/OpenNI2</pkg> (should be preferred over openni)
quirc Enable qrcode decoding via <pkg>media-libs/quirc</pkg> (5.x uses its own QR decoder)
spng Use <pkg>media-libs/libspng</pkg> for png support
tbb Enable multithreading with the Intel Threads Building Block (<pkg>dev-cpp/tbb</pkg>)
tesseract Use Google's OCR Engine
testprograms Build and install programs for testing OpenCV (performance)
truetype Enable <pkg>media-libs/freetype</pkg> support for gapi module
v4l
vaapi
video_cards_intel Enable Video Acceleration API for hardware decoding for Intel cards
vtk Build new 3D visualization module viz based on <pkg>sci-libs/vtk</pkg>
wechat-qrcode Enable wechat_qrcode module

media-sound

amulet

Flag Description
flac
mp3

sonata

Flag Description
mpd Support for mpd fetching
taglib Enable support for taglib

net-im

profanity

Flag Description
gpg Enable PGP support
omemo Enable OMEMO encryption
omemo-qrcode Enable ability to display OMEMO QR code
otr Enable Off-the-Record support (encryption)
spellcheck Enable spellchecking support via app-text/enchant
xscreensaver Use x11-libs/libXScrnSaver for checking idle time

xmppconsole

Flag Description
ncurses Build Ncurses text UI

net-libs

bctoolbox

Flag Description
mbedtls Use <pkg>net-libs/mbedtls</pkg> as TLS backend

libinfinity

Flag Description
server Build the infinote standalone server

sci-libs

ausaxs

Flag Description
executables Install the saxs_fitter, em_fitter and rigidbody_optimizer CLI tools

cholmod

Flag Description
gpl Build the GPL-licensed CHOLMOD submodules (MatrixOps, Modify, Partition, Supernodal) as a group. Disabling keeps CHOLMOD strictly LGPL; the core Cholesky submodule is always built.

faiss

Flag Description
cpu_flags_x86_avx2
cpu_flags_x86_avx512f

hdf

Flag Description
szip

hipBLAS

Flag Description
rocsolver Add additional functions from <pkg>sci-libs/rocSOLVER</pkg>

miopen

Flag Description
amdgpu_targets_gfx908
amdgpu_targets_gfx90a
amdgpu_targets_gfx942
amdgpu_targets_gfx950
composable-kernel Use <pkg>sci-libs/composable-kernel</pkg> for GEMM-like and reduction-like operators
rocblas Build with <pkg>sci-libs/rocBLAS</pkg> support

nexus

Flag Description
cxx
hdf4 Support the old HDF4 representation

pgplot

Flag Description
motif

rocFFT

Flag Description
perfscripts Install rocfft-perf performance visualization suite

sci-misc

llama-cpp

Flag Description
sycl Build an Intel SYCL backend (Arc GPU, Intel CPU via oneAPI). Requires a -fsycl-capable compiler (Intel icpx or clang++ with SYCL patches) installed separately.

stable-diffusion-cpp

Flag Description
webm Support the webm audiovisual media file format

sci-ml

amd-gaia

Flag Description
eval Install evaluation harness deps (anthropic, scikit-learn, reportlab) for gaia.eval benchmarks
talk Pull openai-whisper (ASR) + sounddevice (audio I/O) for gaia.talk's voice pipeline; the Kokoro TTS half is unavailable until that chain lands and is not pulled by this flag

caffe2

Flag Description
distributed Support distributed applications
fbgemm Use <pkg>sci-ml/FBGEMM</pkg>
flash Enable flash attention
gloo Use <pkg>sci-ml/gloo</pkg>
kineto Use<pkg>sci-ml/kineto</pkg>profiling library
memefficient Enable mem efficient attention
mimalloc Use <pkg>dev-libs/mimalloc</pkg> as replacement for system malloc
mpi
nccl Use <pkg>dev-libs/rccl</pkg> (NCCL compatible) backend for distributed operations
nnpack Use <pkg>sci-ml/NNPACK</pkg>
onednn Use <pkg>sci-ml/oneDNN</pkg>
qnnpack Use QNNPACK
xnnpack Use <pkg>sci-ml/XNNPACK</pkg>

evalplus

Flag Description
perf Pull dev-python/cirron and dev-python/pympler for the evalperf-style perf-counter evaluation

lemonade

Flag Description
fastflowlm Pull in <pkg>sci-ml/fastflowlm</pkg> as the NPU backend (renamed to system-fastflowlm from 11.0.0; kept for 10.10.0-r3)
system-fastflowlm Reuse the system <pkg>sci-ml/fastflowlm</pkg> (/usr/bin/flm) for the FastFlowLM NPU backend instead of letting lemond auto-download the flm runtime at first NPU use
system-kokoro Reuse the system <pkg>sci-ml/kokoros</pkg> (/usr/bin/koko) for the Kokoro TTS backend instead of fetching an upstream prebuilt binary at runtime
system-llamacpp Reuse the system <pkg>sci-misc/llama-cpp</pkg> (/usr/bin/llama-server) for the llama.cpp backend instead of fetching an upstream prebuilt binary at runtime; build it with your preferred GPU backend (see the post-install notes)
system-rocm Point lemond's ROCm runtime at the system ROCm in /usr (via ROCM_PATH) so its rocm-stable image/audio backends reuse it instead of downloading AMD's multi-GB TheRock runtime; requires a system ROCm (pulls <pkg>dev-util/hip</pkg>). Mutually exclusive with system-therock
system-sdcpp Reuse the system <pkg>sci-misc/stable-diffusion-cpp</pkg> (/usr/bin/sd-server) for the stable-diffusion.cpp backend instead of fetching an upstream prebuilt binary at runtime; build it with your preferred GPU backend (see the post-install notes)
system-therock Point lemond's ROCm runtime at <pkg>dev-util/therock-bin</pkg> in /opt/therock-bin (via ROCM_PATH) instead of downloading AMD's TheRock runtime; pinned to the 7.13 line whose version matches lemond's expected ROCm. Mutually exclusive with system-rocm
system-whispercpp Reuse the system <pkg>app-accessibility/whisper-cpp</pkg> (/usr/bin/whisper-server) for the whisper.cpp backend instead of fetching an upstream prebuilt binary at runtime; build it with your preferred GPU backend (see the post-install notes)
tauri Build the Tauri desktop app (lemonade-app) -- a native webkit2gtk window wrapping the same renderer as USE=webui. Pulls a Rust toolchain (<pkg>dev-lang/rust</pkg>) plus <pkg>net-libs/webkit-gtk</pkg>, and fetches Rust crates over the network at build time

lm-eval

Flag Description
ifeval Enable instruction-following evaluation tasks (leaderboard_ifeval and friends) — checks generated text against structural constraints like length limits, language hints, and required keywords. Auto-downloads the NLTK punkt_tab tokenizer at task-load time (not deferred until eval); seed ~/nltk_data ahead of time on offline hosts.
math Enable math-grading tasks (minerva_math, leaderboard math, hendrycks_math, etc.) — parses LaTeX answers and verifies symbolic equality between predicted and ground-truth solutions
sentencepiece Pull sci-ml/sentencepiece for tasks that tokenise via SentencePiece
statsmodels Pull dev-python/statsmodels for the discrim_eval task family
vllm Wire dev-python/vllm for the vLLM model backend

sherpa-onnx

Flag Description
portaudio Build the example CLI tools that record/play audio (portaudio is vendored + statically linked by upstream cmake)
tts Build text-to-speech support (pulls vendored espeak-ng-for-piper at build time)
websocket Build the WebSocket server and client examples

sci-physics

prismatic

Flag Description
double-precision Build with 64-bit floating point precision (default is single precision).

sci-visualization

gwyddion

Flag Description
jansson Enable <pkg>dev-libs/jansson</pkg>-based JSON import/export
perl
ruby
unique Enable single-instance support via <pkg>dev-libs/libunique</pkg>
zlib

sys-kernel

kernel-cleaner

Flag Description
parallel Add support for <pkg>sys-process/parallel</pkg>

x11-libs

gtk+

Flag Description
aqua
vim-syntax
xinerama

wxGTK

Flag Description
curl
lzma
pch
webkit