How do you compile kernel power 47 ?

I tried compiling the source in scratchbox, but that does not seem to work.

When installing the kernel-power-source package, I could compile the kernel in scratchbox (after some small changes). But that seems to be the source for kernel power v46, not v47.

I successfully linked an (modified) version of a later v4l tree to the kernel-power-source v46 package so that I could compile modules for my DVB-T adapter. my PCTV nanostick now works with the n900, but I would like to add the modules to the kernel-power v47.
So that is why I ask how you compile the kernel-power v47. Do you use scratchbox? Or do you compile outside scratchbox using emdebian tools or something?