You can just compile the kernel up to 2.6.X, from what I understand its a pain in the serial port though because you have to remove incompatible libs and packages or update them in a certain order to do it, just like is required to build LFS. It might even be healthy practice in software compiling. Go to http://tldp.org?
They should have relevant documentation.
Even still it would be simpler to just use the LiveCD or to install Ubuntu or another relevant host because from what I learned the toolchain is designed to remove remnants of the host so you don't have to worry about lingering elements.