USE flag

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USE flags are keywords that embodies support and dependency-information for a certain concept. They are a core feature of Gentoo, and a good understanding of how to deal with them is needed for administering a Gentoo system.

Basic concepts on how to implement USE flags can be found in the Handbook.

Declaring USE flags

The default set of USE flags is defined by the selected profile. Changing them can be done in /etc/portage/make.conf and/or /etc/portage/package.use. For details see the Using USE flags section of the amd64 Handbook.

USEful commands

To see which USE flags are presently enabled:

user $portageq envvar USE | xargs -n 1

To check if a certain USE flag is activated and which packages use it, run:

user $euse -I <use_flag>
user $quse <use_flag>
user $eix --installed-with-use <use_flag>

Replace <use_flag> with the USE flag to be checked.

Emerge command options

The emerge command has some USE flag related options like:

  • emerge --changed-use (-U)
  • emerge --complete-graph-if-new-use < y | n >
  • emerge --newuse (-N)

For details see man 1 emerge

Tools

Some tools are available for analyzing and managing USE flags:

See also

External resources