The fglrx driver don't compile on Slackware 12.2 for now. This is why you only got the 12.1 version at slackbuilds.org, and this why you couldn't make a package of it. See this quote of slackbuild's changelog:
Code:
system/fglrx-driver: Removed - this won't compile on 12.2. A newer release
probably will (according to feedback on the -users mail list), but we'll
wait for the maintainer to push an update.
system/fglrx-module: Removed - see above note in fglrx-driver. --rworkman
So my best advise for now is to use the "vesa" driver instead. At least you should be able to start X with it.
Only replace "fglrx" by "vesa", in xorg.conf, it *should* work.
If it still doesn't work, let us know which error messages (with EE at the beginning) you get after "startx". Or you can issue that command (as root):
Code:
tail --lines 100 /var/log/Xorg.0.log|grep EE
and send the output.