Originally Posted by AaronP
I'm not sure where you got a "1.4.99" version of X because there's no release with that version, but support for the new ABI will be provided once it has been finalized and a real 1.5.0 X server has been released.
New xorg server packages were updated in Fedora Development (rawhide 20071114).
See Also :
* Severe X breakage heads up