error compiling official kernel 2.4.1

[Sergio Brandano <sb@dcs.qmw.ac.uk>]

 More info are available on request.

 Sergio

...
make all_targets
make[3]: Entering directory `/usr/src/linux/drivers/video'
gcc -D__KERNEL__ -I/usr/src/linux/include -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -fno-strict-aliasing -D__powerpc__ -fsigned-char -msoft-float -pipe -ffixed-r2 -Wno-uninitialized -mmultiple -mstring    -c -o chipsfb.o chipsfb.c
chipsfb.c: In function `chips_set_bitdepth':
chipsfb.c:392: `display_info' undeclared (first use in this function)
chipsfb.c:392: (Each undeclared identifier is reported only once
chipsfb.c:392: for each function it appears in.)
chipsfb.c: In function `chips_of_init':
chipsfb.c:671: warning: implicit declaration of function `pci_device_loc'
chipsfb.c:675: warning: implicit declaration of function `pci_io_base'
make[3]: *** [chipsfb.o] Error 1
make[3]: Leaving directory `/usr/src/linux/drivers/video'
make[2]: *** [first_rule] Error 2
make[2]: Leaving directory `/usr/src/linux/drivers/video'
make[1]: *** [_subdir_video] Error 2
make[1]: Leaving directory `/usr/src/linux/drivers'
make: *** [_dir_drivers] Error 2
<root> -->