yes "" | make config: This runs make config and answers "Y" to every question the config script asks the user. We're not configuring the real kernel here, we just need to have some sort of configure file created so that we can run make dep next that will create a few files in $LFS/usr/src/linux/include/linux, like version.h, among others, that we will need to compilg Glibc and other packages later in chroot. make dep: make dep checks dependencies and sets up the dependencies file. We don't really care about the dependency checks, but what we do care about is that make dep creates those aforementioned files in $LFS/usr/src/linux/include/linux we will be needing later on. ln -s ../src/linux/include/linux and ln -s ../src/linux/include/asm: These commands create the linux and asm symlinks in the $LFS/usr/include directory that point to the proper directories in the Linux source tree. Packages that need kernel headers include them with lines like #include <linux/errno.h>. These paths are relative to the /usr/include directory so the /usr/include/linux link points to the directory containing the Linux kernel header files. The same goes for the asm symlink.