[...LOTS of output]
  CC      lib/zlib_deflate/deftree.o
  CC      lib/zlib_deflate/deflate_syms.o
  LD      lib/zlib_deflate/zlib_deflate.o
  LD      lib/zlib_deflate/built-in.o
  CC      lib/zlib_inflate/infblock.o
  CC      lib/zlib_inflate/infcodes.o
  CC      lib/zlib_inflate/inffast.o
  CC      lib/zlib_inflate/inflate.o
  CC      lib/zlib_inflate/inftrees.o
  CC      lib/zlib_inflate/infutil.o
  CC      lib/zlib_inflate/inflate_syms.o
  LD      lib/zlib_inflate/zlib_inflate.o
  LD      lib/zlib_inflate/built-in.o
  LD      lib/built-in.o
  CC      lib/bitmap.o
  CC      lib/bust_spinlocks.o
  CC      lib/cmdline.o
  CC      lib/ctype.o
  CC      lib/div64.o
  CC      lib/dump_stack.o
  CC      lib/errno.o
  CC      lib/extable.o
  CC      lib/idr.o
  CC      lib/int_sqrt.o
  CC      lib/kobject.o
  CC      lib/parser.o
  CC      lib/radix-tree.o
  CC      lib/rbtree.o
  CC      lib/rwsem.o
  CC      lib/string.o
  CC      lib/vsprintf.o
  AR      lib/lib.a
  LD      arch/i386/lib/built-in.o
  CC      arch/i386/lib/bitops.o
  AS      arch/i386/lib/checksum.o
  CC      arch/i386/lib/dec_and_lock.o
  CC      arch/i386/lib/delay.o
  AS      arch/i386/lib/getuser.o
  CC      arch/i386/lib/memcpy.o
  CC      arch/i386/lib/mmx.o
  CC      arch/i386/lib/strstr.o
  CC      arch/i386/lib/usercopy.o
  AR      arch/i386/lib/lib.a
  GEN     .version
  CHK     include/linux/compile.h
  UPD     include/linux/compile.h
  CC      init/version.o
  LD      init/built-in.o
  LD      .tmp_vmlinux1
arch/i386/kernel/built-in.o(.text+0xd094): In function `powernow_acpi_init':
: undefined reference to `acpi_processor_register_performance'
arch/i386/kernel/built-in.o(.text+0xd0bb): In function `powernow_acpi_init':
: undefined reference to `acpi_processor_unregister_performance'
arch/i386/kernel/built-in.o(.exit.text+0x3b): In function `powernow_exit':
: undefined reference to `acpi_processor_unregister_performance'
drivers/built-in.o(.init.text+0x726c): In function `init_sc520cdp':
: undefined reference to `mtd_concat_create'
drivers/built-in.o(.exit.text+0x1cbf): In function `cleanup_sc520cdp':
: undefined reference to `mtd_concat_destroy'
make[1]: *** [.tmp_vmlinux1] Error 1
make[1]: Leaving directory `/usr/src/kernel-source-2.6.8'
make: *** [stamp-build] Error 2