Problem with compiling kernel

[msh]

Hi

I am trying to compile a new kernel(linux-2.4.20-gentoo-r1) for my gentoo system but when I try to compile it fails with the following error:

drivers/char/drm/drm.o(.text+0x7146): In function `sis_fb_alloc':
: undefined reference to `sis_malloc'
drivers/char/drm/drm.o(.text+0x718d): In function `sis_fb_alloc':
: undefined reference to `sis_free'
drivers/char/drm/drm.o(.text+0x72d5): In function `sis_fb_free':
: undefined reference to `sis_free'
drivers/char/drm/drm.o(.text+0x77a6): In function `sis_final_context':
: undefined reference to `sis_free'
make: *** [vmlinux] Error 1

Does anybody know whats wrong or have a hint to where I can locate the problem?