I tried following your guide too, both fresh install and original install, no luck. This is on debian 6.
Like filoudu am getting the same undefined symbol atan2 error.
Already had the very latest versions of all the files in question. Was infact the first thing I checked before searching for solutions to this issue.
As for no more sourcemod updates for a while, I'd expect considering this issue, they'll already be working on a proper fix anyways. Be daft not to considering how many people rely on sourcemod.