The Solaris Porting Layer (SPL) is a Linux kernel module which provides many of the Solaris kernel APIs. This shim layer makes it possible to run Solaris kernel code in the Linux kernel with relatively minimal modification. This can be particularly useful when you want to track upstream Solaris development closely and do not want the overhead of maintaining a large patch which converts Solaris primitives to Linux primitives. You need this if you want to run ZFS on Linux. NOTE: You'll need the kernel source code to be able to compile this. This package is kernel dependent, so you'll need to recompile it for every new kernel you choose to run. If you don't have a /usr/src/linux symlink pointing to your real kernel directory (the script looks for it there by default), specify your kernel source destination by LINUXPATH= ./spl-solaris.SlackBuild