CONFIG_MACH_PCM037 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Support Phytec pcm037 (i.MX31) platforms

modulename: mach-pcm037.ko

configname: CONFIG_MACH_PCM037

Linux Kernel Configuration
└─>Freescale i.MX family
└─>Support Phytec pcm037 (i.MX31) platforms
In linux kernel since version 2.6.27 (release Date: 2008-10-09)  
Include support for Phytec pcm037 platform. This includes
specific configurations for the board and its peripherals.

source code:
arch/arm/mach-imx/mach-pcm037.c


is selected by
CONFIG_MACH_PCM037_EET