In F12 x86_64, I had to up the mmap_min_addr as suggested http://lists.scratchbox.org/pipermai...st/001530.html :

echo "vm.mmap_min_addr = 1048576" >> /etc/sysctl.conf

Otherwise dbus / hal / other .debs wouldn't install in the scratchbox chroot.

I wrote up all the steps at http://www.martindengler.com/index.html#2010-02-03 because I found that three guides (at least to get this up & running was one or two too many .