In this chapter, you'll set up a new toolchain based on the uClibc C - library. You wonder, why we're setting up a new one? The simple reason is: The size of busybox is now about 789 KB. If you compile busybox against the new C - library, its size will shrink to about 290 KB. You save valuable 500 KB! In this and the next chapters, every program will be linked against this new C - library. With this technique, we maximize the functionality of our software router while controlling the growth of the single programs.