CONFIG_M5307C3 is not available for thedefaultarchitecture x86.
Result is shown for architecture m68k
Motorola M5307C3 board support
configname: CONFIG_M5307C3
Linux Kernel Configuration
└─>Motorola M5307C3 board support
In linux kernel since version 2.6.12
Support for the Motorola M5307C3 board.