This is extremely similar to building a regular kernel, but there are a couple "gotchas". Mostly, cooperative_fs.h must be modified, as explained in , and make sure to always use gcc-3.3 (which is the cross-compiler used for the coLinux daemon 2.6.3 (as of 2006-07-8)). Mostly follow the instructions in Building_a_custom_kernel . Make sure to get kernel version 2.6.11.x, since the coLinux patch hasn't been ported to 2.6.12 yet.