Build Custom Loadable Kernel Module (LKM) for Raspberry Pi

Begin by updating your package database

$ sudo apt-get update

Install the Raspbian header files for the kernel

$ sudo apt-get install raspberrypi-kernel-headers

It appears I may need to update my kernel to the version of the header files I just installed

$ sudo apt-get dist-upgrade

Helpful links:

https://www.geeksforgeeks.org/linux-kernel-module-programming-hello-world-program/
https://www.tldp.org/HOWTO/pdf/Module-HOWTO.pdf

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