CONFIG_PPC_CELLEB is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc
default or selected kernelversion does not have config value CONFIG_PPC_CELLEB.
Result is shown for kernelversion 6.5.1

Toshiba's Cell Reference Set 'Celleb' Architecture

configname: CONFIG_PPC_CELLEB

Linux Kernel Configuration
└─>Toshiba's Cell Reference Set 'Celleb' Architecture
In linux kernel since version 2.6.22 (release Date: 2007-07-08)