CONFIG_MACH_OMAP3_PANDORA is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

OMAP3 Pandora

modulename: board-omap3pandora.ko

configname: CONFIG_MACH_OMAP3_PANDORA

Linux Kernel Configuration
└─>OMAP3 Pandora
In linux kernel since version 2.6.29 (release Date: 2009-03-23)  
source code:
/arch/arm/mach-omap2/