i have come across an error with xorg 6.8. i installed hardened gentoo onto my server, and when i came to try and install xorg, i installed it and then it wouldn start. theres a bug with hardened gentoo and xorg but i dont belive its with a normal gentoo installation. so i just left my server with command because i dont a GUI!
and yes, to install a program with a certain version use the command,
emerge =xorg-x11-6.7.0-r2 for example or
emerge -s =xorg-x11-6.7.0 to search for a version, all you need is a "=" to set the version.
also another tip, whenever i install something i always do
emerge --pretend --verbose gnome for example so then you can see what it will install and what it will install with. then
emerge gnome.
if you what to add or remove a use flag, use for example
USE="gnome" emerge --pretend --verbose xorg-x11 to add gnome to the use flags and check them then, then
USE="gnome" emerge xorg-x11 or.....
USE="-gnome" for example to remove gnome from the use flags
these are purely examples and can be applied when
"emergeing" anything.