CONFIG_BOARD_ATSTK100X_SW4_CUSTOM is not available for thedefaultarchitecture x86.
Result is shown for architecture avr32

SW4: use ISI/Camera (not GPIOs, SPI1, and PS2-B)

configname: CONFIG_BOARD_ATSTK100X_SW4_CUSTOM

Linux Kernel Configuration
└─>SW4: use ISI/Camera (not GPIOs, SPI1, and PS2-B)
In linux kernel since version 2.6.25 (release Date: 2008-04-16)  
To use the camera interface you'll need a custom card (on the
PCI-format connector) connect a video sensor.