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Translations:Eclean/7/en
From Gentoo Wiki (test)
By default, source files are located in the /usr/portage/distfiles directory, while binary packages are located in the /usr/portage/packages directory. The locations for each can be changed by altering the DISTDIR and the PKGDIR variables respectively in /etc/portage/make.conf. Both locations can grow quite big if not periodically cleaned; this is the reason eclean was created.