With sys-fs/lufs-0.9.7-r2.ebuild on a new 2.6 system, the emerge fails with the 'disablekernelsupport' USE flag on an "Incompatible kernel setup" error called by kmod_make_linux_writable, this should not happen when using the 'disablekernelsupport' USE flag as only the userspace tools should be built/installed, no kernel modules. Secondary to this issue is the fact that in the src_install function, 'nokernelsupport' is referenced instead of the actual local USE flag 'disablekernelsupport'. Wrapping the kmod_make_linux_writable calls in use disablekernelsupport conditionals still fails as kmod_make_linux_writable is still getting called somewhere, even though all the kmod.eclass provided functions are being overridden. I've set the blocker severity as this issue prevents someone who has compiled LUFS support into their kernel from using LUFS at all.
Can you please try if this is fixed by Bug 67212, comment if it works and add a dependency?
lufs uses fuse now for kernel support. Thank you for reporting.