There's no Direct X for Linux, so this doesn't apply there.
Talkirc (atys)
not sure if this matters or will be the help or not, but a direct x redistribuite from june of 2010 fixes some known issues with getting ryzom to work with windows based systems, not sure if it also works for linux and mac (as i don't know exactly how direct x works with those two OS options)
but look for this directx redistrivuite june 2010, sorry for spelling error, but you know what to google, my spell check is not working, lolx.