Profiles
This section provides details on the profiles/ directory. All of these
files are also documented in man portage, but the canonical reference
for profiles is in the
Package Manager Specification.
Portage-specific behaviour must not be relied upon in the repository.
Profiles must not contain a package.provided file. It was used to
pretend that a package was installed without an ebuild being merged for it,
which could not express slots or USE flags correctly. Use a virtual package
instead, see Virtuals.