euse

List active global USE flags

$ euse -a -g

$ euse -a -l

$ sudo euse -E useflag

$ sudo euse -D useflag

$ sudo euse -P useflag

$ euse -i useflag

euse [options] [useflag]

euse is a Gentoo utility to enable, disable, and obtain information about USE flags. USE flags control which optional features are compiled into packages during installation, allowing fine-grained control over software capabilities, dependencies, and binary size.
The tool simplifies USE flag management by providing a command-line interface to modify system and package-specific flags without manually editing configuration files. This is central to Gentoo's philosophy of compile-time customization.

-a, --active

Show active USE flags

Operate on global USE flags (make.conf)

Operate on local USE flags (package.use)

Enable the specified USE flag

Disable the specified USE flag (adds '-' prefix)

Remove the specified USE flag from configuration

Show information about a USE flag

/etc/portage/make.conf

Global USE flags for the entire system set via the USE variable.

Per-package USE flag settings organized in files within this directory.

Global USE flags are set in /etc/portage/make.conf. Local USE flags are set in /etc/portage/package.use/. After changing USE flags, affected packages should be rebuilt with emerge --changed-use.

euse is part of gentoolkit, a collection of administration scripts for Gentoo Linux.

emerge(1), equery(1), portage(5)