Not really. I hit this issue when i compiled FernetMenta's xbmc with native xvba support. I had to move that header file to the /amd/ directory. I dont remember anything else + i did it on Debian so there might be different issues, but since you use the AMD installer it should have everything bundled in and the problems are from misplacing of certain files.
Other than that, libva+xvba is crap. The only program that uses real Xvba right now, is XBMC's FernetMenta branch (may be other implementations, but this works surely).
I have compiled it and i can tell you its a world difference from libva both in performance and quality (its not as good as VDPAU B-C, but for my needs works perfectly). Libva-xvba chokes on many files + uses more CPU whereas native xvba uses almost no CPU for decoding and decodes almost all files.
Well I would just like to play HD movies in VLC player under Linux without problems just as I can do I Windows - that's all I really didn't know that is soooo hard to enable hardware acceleration in Linux...
Libva+xvba/vdpau comes OOTB on most distros. Maybe not Fedora?. Just its not that good as native Xvba or VDPAU (it uses these as backends, but doesnt support their full feature set).
XBMC is one of the few media players that supports just about every HW decode under Linux, vaapi (Intel), libva (VDPAU/Xvba backend - not really working nor needed), VDPAU (native nvidia), Xvba (native AMD - this is in experimental stage but nonetheless works).