How to get shadows in Second Life -alpha-

How to get shadows in Second Life
"1) I used a computer that supported it (so you must have a GeForce 8 or 9 graphics card)

2) I used an operating system that supports it - that is, Windows or Linux. Not Mac OS

3) I downloaded and compiled the source code from the files listed at the top of http://svn.secondlife.com/trac/linden/changeset/575. That is, the slviewer-artwork, slviewer-(linux/win32)-libs and the slviewer-src.

4) Compiled them, largely following the instructions on the wiki at http://wiki.secondlife.com/wiki/Compiling_the_viewer_%28Linux%29 (in the case of Linux, http://wiki.secondlife.com/wiki/Microsoft_Windows_Builds if you're on Windows )

5) Ran it, set the 'Graphics' slider to Ultra, pressed ctrl-alt-D to get the debug settings, went to Advanced -> Debug Settings, typed in RenderDeferred and set it to false, typed in RenderUseFBO and set it to true, and then typed in RenderDeferred again and set it to true.

"Then it hangs for a couple of seconds," warns Katharine, "followed by shadows magically appearing under everything. Affected by sun and moon only."