CONFIG_MACH_RUT100 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Teltonika RUT100

modulename: board-rut1xx.ko

configname: CONFIG_MACH_RUT100

Linux Kernel Configuration
└─>Cortina Systems Gemini Implementations
└─>Teltonika RUT100
In linux kernel since version 2.6.30 (release Date: 2009-06-09)  
Say Y here if you intend to run this kernel on a
Teltonika 3G Router RUT100.

source code:
arch/arm/mach-gemini/board-rut1xx.c