Problem compiling kernel 2.4.20 with epcam.diff

Hello,

I want to compile kernel 2.4.20 with my webcam support (Creative) I download epcam-0.6.diff(patch against 2.4.20) from
http://members.brabant.chello.nl/~j.vreeken/se401/

After patching the kernel have following error:

Unresolved symbols in /lib/modules/2.4.20/kernel/drivers/block/loop.o blk_ioctl
...

Anybody can help me?

Andrew.

PS. linux kernel source distributive was clean (make clean; make mkproper)