After I emerged Neverwinter Nights, I got this:

 * The NWN linux client is now installed.
 * Proceed with the following step in order to get it working:
 * Run /opt/nwn/fixinstall as root
>>> Regenerating /etc/ld.so.cache...
>>> games-rpg/nwn-1.67-r1 merged.
>>> Recording games-rpg/nwn in "world" favorites file...

>>> No packages selected for removal by clean.

>>> Auto-cleaning packages...

>>> No outdated packages were found on your system.


 * GNU info directory index is up-to-date.

I hope I didn't run that step out of order. : (