CONFIG_MACH_COLIBRI is not available for the selected architecture x86.
Result is shown for architecture arm

Toradex Colibri PX27x

modulename: colibri.ko

and/or

pxa2xx_colibri.ko

and/or

colibri-pxa270.ko

configname: CONFIG_MACH_COLIBRI

Select target board
└─>Toradex Colibri PX27x
In linux kernel since version 2.6.25 (release Date: 2008-04-16)
source code:
arch/arm/mach-pxa/colibri.c
selects
CONFIG_PXA27x

depends
 or CONFIG_ARCH_PXA |
NOT | CONFIG_ARCH_PXA_V7

is selected by
CONFIG_PCMCIA_PXA2XX