building kernel via source rpm

Hi,

I want to build a x86_64 kernel on my i386 system. After installing
kernel-2.6.9-34.EL.src.rpm and after issuing this command
#  rpmbuild -ba   --target  x86_64-redhat-linux     kernel-2.6.spec

I get this error:

CONFIG_FB_I810
CONFIG_FRAME_POINTER
CONFIG_DEBUG_STACKOVERFLOW
CONFIG_DEBUG_STACK_USAGE
CONFIG_DEBUG_PAGEALLOC
CONFIG_4KSTACKS
CONFIG_CRYPTO_AES_586
make[1]: *** [nonint_oldconfig] Error 51
make: *** [nonint_oldconfig] Error 2
error: Bad exit status from /var/tmp/rpm-tmp.65413 (%build)


RPM build errors:
    Bad exit status from /var/tmp/rpm-tmp.65413 (%build)



Is there anything that I am doing wrong?
-- 
Omer Faruk Sen
http://www.faruk.net