USE flag/zh-cn

USE 标志是体现某个概念的支持和依赖信息的关键字. 它们是 Gentoo 的核心功能，管理 Gentoo 系统需要很好地理解如何处理它们.

关于如何实现 USE 标志的基本概念可以在 Handbook/zh-cn 中找到.

声明USE标志
The default set of USE flags is defined by the selected profile. Changing them can be done in and/or. For details see the Using USE flags section of the Handbook.

USEful commands
To see which USE flags are presently enabled:

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

Replace  with the USE flag to be checked.

Emerge command options
The 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.

Tools
Some tools are available for analyzing and managing USE flags:


 * euse
 * quse - for details see
 * equery hasuse (USE flag)
 * equery uses (package name)
 * ufed
 * - GTK+ utility to help manage Portage's user config files
 * eix - See,   and   options
 * - GTK+ utility to help manage Portage's user config files
 * eix - See,   and   options

External resources

 * https://packages.gentoo.org/useflags/ - USE flags on Gentoo Packages Database.
 * - The common USE flag description list can be seen locally on systems with Portage installed.
 * https://www.gentoo.org/support/use-flags/ - The full USE flag index.
 * https://devmanual.gentoo.org/general-concepts/use-flags/ - USE flags conceptually explained in the Gentoo Developer Handbook.