The following information could do with being added to the X configuration guide in the above article: Section 2 Installing X Server: The following command needs to be run before 'startx' is available to the user: "env-update && source /etc/profile" this then places startx in the path.
There already is something similar in the text: # emerge xfree # env-update && source /etc/profile Ofcourse, if the user was already logged on before the "emerge xfree" finished, he has to run the second command too.