Fedora 20 - Kernel 3.11.10-301 - KDE 4.11.3 - Catalyst 13.12
I installed the Catalyst 13.12 from amd.com and replace its files with the one in https://github.com/kolasa/fglrx-13.251 and it worked with no problem till now. (I use KDE on Fedora 20 with kernel 3.11.10-301)
1- Download the driver
2- Execute it
3- After reaching the first dialog of the installer overwrite files extracted from the installer "../install/lib/modules/fglrx/build_mod/" with the files from the above link.
4- Continue the installer