If you have rpm with debian, use rpm2tgz to reformat. Decompress and copy the relevant files [...you probably won't need icons, guis and links

] manually to their corresponding directories in your / tree.
cd /lib/modules/fglrx/build_mod
sh make.sh
cd ../
sh make_install.sh
...the usual, not in X, make_install as root, you need kernel-sources ...this will build the fglrx.o
modprobe fglrx
fglrxconfig ...to write the new config
...startx
If you built your own kernel, make sure you have no video driver built into it and if your motherboard chipset is supported, you should be in business.