default or selected kernelversion does not have config value CONFIG_MEILHAUS.
Result is shown for kernelversion 5.15.31

Meilhaus support

modulename: memain.ko

configname: CONFIG_MEILHAUS

Linux Kernel Configuration
└─>Device Drivers
└─>Staging drivers
└─>Meilhaus support
In linux kernel since version 2.6.29 (release Date: 2009-03-23)  
If you have a Meilhaus card, say Y (or M) here.

You need both this driver, and the driver for the particular
data collection card.

To compile this driver as a module, choose M here. The module will
be called memain.

source code:
depends
CONFIG_MODULES
CONFIG_STAGING
NOT CONFIG_STAGING_EXCLUDE_BUILD