Kernel Build Problem - Redhat 9.0 - 2.4.20-20.9

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I installed 9.0 on a new machine.
 
Then upgraded the kernel to 2.4.20-20.9 by installing the following rpms (from RHN).
 
kernel-2.4.20-20.9.i386.rpm
kernel-source-2.4.20-20.9.i386.rpm
 
I then deleted the old kernel (cant remember which one) using rpm -e.
 
Then rebooted off the new kernel. (I only have one kernel on my machine now which is the 2.4.20-10.9 one).
 
I have only one set of kernel source as well which is 2.4.20-10.9 as well.
 
I then wanted to practice building a new kernel so I decided to build the kernel using the config that I found in /boot/config-2.4.20-20.9 which i assumed (probably incorrectly) that this is the .config file which was used to build the 2.4.20-20.9 kernel supplied by RHN.
 
So I copied this file to /usr/src/linux-2.4.20-20.9/.config.
 
Then did
 
make clean
make dep
make bzImage
 
And ... my build fails with the following
 
gcc -D__KERNEL__ -I/usr/src/linux-2.4.20-20.9/include -Wall -Wstrict-prototypes\
 -Wno-trigraphs -O2 -fno-strict-aliasing -fno-common -fomit-frame-pointer -pipe\
 -mpreferred-stack-boundary=2 -march=i386   -nostdinc -iwithprefix include -DKB\
UILD_BASENAME=io_apic  -c -o io_apic.o io_apic.c
io_apic.c:45: `dest_LowestPrio' undeclared here (not in a function)
io_apic.c: In function `__mask_IO_APIC_irq':
io_apic.c:140: warning: implicit declaration of function `io_apic_read'
io_apic.c:140: warning: implicit declaration of function `io_apic_modify'
io_apic.c:140: warning: implicit declaration of function `io_apic_sync'
io_apic.c: In function `clear_IO_APIC_pin':
io_apic.c:169: storage size of `entry' isn't known
...
 
I am confused because I thought that the kernel I am currently running would have been built using the sources in the kernel-source rpm that i installed and thus a make bzImage (without any mods to the config) would build a kernal that is identical.
 
Perhaps I need to install patches to this kernel from somewhere?
 
I did not change anything in the kernel .config file, since I am just practicing kernel builds to prep for my next project that does involve a custom kernel.
 
Any help would be appreciated.
 
Thanks
 

 

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