CONFIG_M5407C3 is not available for the selected architecture x86.
Result is shown for architecture m68k
Motorola M5407C3 board support
configname: CONFIG_M5407C3
Linux Kernel Configuration
└─>Motorola M5407C3 board support
In linux kernel since version 2.6.12 )
Support for the Motorola M5407C3 board.