I need help building Kernel for TS 5500/TS Linux

I am trying to build the kernel for TS 5500 with iptable modules
enabled. I am following the directions from
http://www.embeddedx86.com/linux/html_docs/Kernel_buld_HowTo.html ;
however, getting the following error message (this is partial
message):


sched.c:839: error: conflicting types for 'sleep_on_timeout'
/home/tamim/Desktop/linux-2.4.23/include/linux/sched.h:596: error:
previous declaration of 'sleep_ on_timeout' was here
sched.c:210: warning: 'reschedule_idle' declared `static' but never
defined
make[2]: *** [sched.o] Error 1
make[2]: Leaving directory `/home/tamim/Desktop/linux-2.4.23/kernel'
make[1]: *** [first_rule] Error 2
make[1]: Leaving directory `/home/tamim/Desktop/linux-2.4.23/kernel'
make: *** [_dir_kernel] Error 2

Please help me. Thanks.

Am Khan