This is the closest I've come to actually being able to compile a kernel 
 > 2.5.25 yet...

But there seems to be one more problem at the very end:

   ld -m elf_i386  -r -o init.o main.o version.o do_mounts.o
make[1]: Leaving directory `/usr/src/linux-2.5.32/init'
  ld -m elf_i386 -T arch/i386/vmlinux.lds -e stext 
arch/i386/kernel/head.o arch/i386/kernel/init_task.o init/init.o 
--start-group arch/i386/kernel/kernel.o arch/i386/mm/mm.o 
kernel/kernel.o mm/mm.o fs/fs.o ipc/ipc.o security/built-in.o 
/usr/src/linux-2.5.32/arch/i386/lib/lib.a lib/lib.a 
/usr/src/linux-2.5.32/arch/i386/lib/lib.a drivers/built-in.o 
sound/sound.o arch/i386/pci/pci.o net/network.o --end-group -o vmlinux
net/network.o: In function `register_8022_client':
net/network.o(.text+0xf59f): undefined reference to `llc_sap_open'
net/network.o: In function `unregister_8022_client':
net/network.o(.text+0xf5ca): undefined reference to `llc_sap_close'
net/network.o: In function `snap_init':
net/network.o(.text.init+0x59d): undefined reference to `llc_sap_open'
make: *** [vmlinux] Error 1

Something missing an "include", or just some dodgy .config ???