CONFIG_MULTIFACE_III_TTY is not available for thedefaultarchitecture x86.
Result is shown for architecture m68k

Multiface Card III serial support

configname: CONFIG_MULTIFACE_III_TTY

Linux/68k Kernel Configuration
└─>Character devices
└─>Multiface Card III serial support
In linux kernel since version 2.6.12  
If you want to use a Multiface III card's serial port in Linux,
answer Y.

To compile this driver as a module, choose M here.

depends
CONFIG_AMIGA