Can't build kernel with CONFIG_NUMA_EMU=y

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from kernel-2.6.32-504.3.3.el6.src.rpm
If I set "CONFIG_NUMA_EMU=y" then kernel doesn't compile:

rpmbuild -bb --without xen --without debug --without debuginfo --target=x86_64 ./SPECS/kernel.spec

.....
arch/x86/mm/srat_64.c: In function 'acpi_fake_nodes':
arch/x86/mm/srat_64.c:469: error: implicit declaration of function '__acpi_map_pxm_to_node'
make[2]: *** [arch/x86/mm/srat_64.o] Error 1
make[1]: *** [arch/x86/mm] Error 2

Patrick