ZFS support weak module updates, ZFS does will not always be built for every specific kernel that is installed. Unfortunately, some directories that Lustre needs from ZFS and SPL have a kernel string embedded in them, and now that kernel string will potentially be different than the kernel that Lustre is building against.

As a work around we can update the Lustre build scripts to just select the last subdirectory that has a kernel name from the ZFS and SPL build directories as a directory that Lustre should use in its build. Its as reasonable a guess as I can figure we can easily make.