CONFIG_MACH_NOKIA_N800 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_MACH_NOKIA_N800 (not configurable)

configname: CONFIG_MACH_NOKIA_N800

Linux Kernel Configuration
└─>TI OMAP2/3/4 Specific Features
└─>MACH_NOKIA_N800
In linux kernel since version 2.6.32 (release Date: 2009-12-02)