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There are various reasons that a new profile may be created: the release of new versions of core packages (such as sys-apps/baselayout, sys-devel/gcc, or sys-libs/glibc) that are incompatible with previous versions, a change in the default USE flags or in the virtual mappings, or maybe a change in system-wide settings.
If a new Gentoo release does not include a new profile then just pretend that it never happened.
However, no distribution is more suited than Gentoo to satisfy these kind of demanding users.
From the beginning, Gentoo was designed around the concept of fast, incremental updates.
Gentoo users know however that this process is extremely frustrating for power users that want to live on the bleeding edge.
Even power users from other distributions probably share the same feelings, given the popularity and spread of tools like apt or apt-rpm which make it possible to have quick and frequent updates.
I'm sorry for the newbie question, otherwise a great distro, very engrossing and quite entertaining, perfect as something to play with while I'm at work! Once upon a time, x11-base/xorg-server could be built to use either hal or udev and you needed to choose one.
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.
I am a new gentoo user, just completed my first test install, running in virtualbox as guest.
Anyway, after installing the base system as per handbook, I decided to try and install server which required me to put "x11-base/xorg-server udev" in /etc/portage/
Here in Gentoo land, the concept of upgrading is quite different compared to the rest of the Linux world.
It is a well-known fact that Gentoo never got in touch with the "classic" way of upgrading software: waiting for a new release, downloading it, burning, putting it in the cdrom drive and then following the upgrade instructions.