Portage

is Gentoo's package manager, and is installed by default as part of the stage3 install. See the Gentoo Handbook for more details.

Overlays
In addition to the official repository (colloquially known as "portage tree" because of its traditional placement in ), there are additional repositories which in Gentoo are called overlays.


 * Gentoo Overlays: Users' Guide
 * Layman homepage
 * Browse overlays

You can search through the ebuilds available in the overlays on http://overlays.gentoo.org/ by using eix.

emerge
emerge is the command-line interface to the Portage system.

Relevant Gentoo Wiki pages

 * Useful portage tools
 * Binary package guide
 * Portage tips
 * /etc/portage configuration files
 * Repository format
 * ebuild
 * PMS (Package Manager Specification)
 * Overlay
 * Category:Portage

Related sections of the Gentoo Handbook

 * A Portage Introduction
 * USE flags
 * Portage Features
 * Files and Directories
 * Configuring through Variables
 * Mixing Software Branches
 * Additional Portage Tools

Other official docs

 * GCC optimization
 * Gentoolkit
 * Portage-utils