Emerge config files in etc need updating
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.
* See the CONFIGURATION FILES section of the emerge * man page to learn how to update config files. on my first attempt, the update refosed to run, claiming that "iconv" is required if I specify "truetype".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.The content of this file is the name of the profile that should be "upgraded to"; Portage uses this information to automatically warn administrators when they should update to a new profile.When this happens, it means that Gentoo developers no longer plan on supporting it.When a profile migration is apparent, then the upgrade has to be executed manually.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.A recurring question about the Gentoo release process is: "Why roll out new releases frequently, if they are not intended to let users update software?" There are various reasons: When a release includes new incompatible features, or provides a set of core packages and settings that deeply modify the behavior of the system, we say that it provides a new profile.To upgrade such systems, a recent stage3 can be used to update the system.Instructions for that are given in the Updating old systems section. For this to work, a Unicode locale for the system must be created.