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Make sure to read the description of said profiles before deciding to migrate to one of them.Most architectures now also default to the 2.6 kernel tree where 2.4 was chosen previously.To view the list of supported profiles, call Some systems are too old to just switch the profile.Newer profiles might need more recent Portage versions or other software that cannot be installed anymore because the package definitions (ebuilds) for those older software versions are not available anymore.Generally, such migrations are not mandatory, and systems can continue to use the old profile - just update the packages as explained in the Gentoo Handbook.However, Gentoo strongly recommends updating the profile if it becomes deprecated.
All other archs - There are no fundamental changes in this profile. To switch to the 2005.1 profile, point the - With the 2005.1 release, the ppc and ppc64 profiles were merged and a number of subprofiles for specific subarchitectures were created.The files in the parent directories are part of the profile as well (and are therefore shared by different subprofiles). Profiles obsoleted by new ones are kept in is put in the profile directory.