This is Gentoo's testing wiki. It is a non-operational environment and its textual content is outdated.
Please visit our production wiki at https://wiki.gentoo.org
Translations:Ebuild repository/9/en
From Gentoo Wiki (test)
crossdev will automatically place the ebuilds/categories it generates into the first overlay found in PORTDIR_OVERLAY. Most users will want to prevent crossdev from disturbing layman's overlays or the user's personal per-machine overlay (normally created at /usr/local/portage). Create an overlay specifically for crossdev's use: