Adding KDE after a basic Gentoo install

First install Xorg. You should have compiled your kernel and the nvidia module keeping in mind the need to run Xorg.

http://www.gentoo.org/doc/en/xorg-config.xml

emacs /etc/make.conf

Changes to make.conf:

VIDEO_CARDS="nvidia"

[/code]

emerge -pv xorg-drivers

emerge xorg-server

env-update

source /etc/profile
Finally try a startx

If you momentarily get a blank screen, X may be setup correctly. Can test with emerge twm (but remeber to unmerge them)
emerge -av kde-meta
If there are use changed you need to write:
emerge -av kde-meta --autounmask-write
(Watch for another command which writes merges the changes to config files)
After installing and compiling packages of KDE, we can try to start kdm
kdm[/code]

If all went well, KDE should start. I got a few errors with dbus and consolekit, which caused KDM to show windows without the resize/min/max buttons, and a few error message popups.
Consolekit session failed to connect to socket.
Solved by:

First see if dbus starts fine:

/etc/init.d/dbus restart
If it does, then:

rc-update add dbus default

rc-update add consolekit default
To make KDM start automatically at boot:

sudo emacs /etc/rc.conf
Add the line:

DISPLAYMANAGER="kdm"
Then add xdm to default runlevel:
rc-update add xdm default