Cloop Compilation: 'm_Probability undeclared'

I am trying to make a bootable USB thumb drive, and I am having problems with cloop. I followed the tutorial here: http://rz-obrian.rz.uni-karlsruhe.de/knoppix-usb/. I cannot mount the knoppix compressed img without cloop. I tried to compile cloop against my kernel src: make KERNEL_DIR=/usr/src/linux-2.6.6 and I get the error "m_Probability undeclared' in file "7z/AriBitCoder.h.' Has anybody seen this before? How can I fix this?
Thanks!
Blake
[email protected]