It seems linux/config.h has been deprecated in linux 2.6.19. Patch remains compatibility with at least 2.6.18 (tested).
Created attachment 101668 [details, diff] ati-drivers-8.30.3-linux-2.6.19.patch
Created attachment 101669 [details, diff] ati-drivers-8.30.3-r1.ebuild.patch
*** This bug has been marked as a duplicate of 151596 ***