CONFIG_M68K is not available for thedefaultarchitecture x86.
Result is shown for architecture m68k
CONFIG_M68K (not configurable)
configname: CONFIG_M68K
Linux Kernel Configuration
└─>M68K
In linux kernel since version 2.6.12
selects
CONFIG_HAVE_IDECONFIG_HAVE_AOUT
CONFIG_GENERIC_ATOMIC64
CONFIG_HAVE_GENERIC_HARDIRQS
CONFIG_GENERIC_IRQ_SHOW