Due that now the Kbd keymap files are installed into /lib/kbd, the commands found in the book to build the keymap into the kernel are broken.
The fix for the bootable chapter is as easy as to change in bootable/x86/kernel.xml
loadkeys -m /usr/share/kbd/keymaps/[path to keymap] > drivers/char/defkeymap.c
by
loadkeys -m /lib/kbd/keymaps/[path to keymap] > drivers/char/defkeymap.c
Fixing also the path in the paragraph below that command.
But that don't will work for the boot chapter due that we can't know beforehand where the keymap files are installed on the host.
Thus in the boot chapter the XIncludes to that blocks must be replaced by a proper command and text, or full removed.