Include New Library For own Hal-Componet

Hi everyone
Can someone tell you step by step how to import a library to create a new hal component. Or if it's not difficult to write a guide for dummies. What to put in what folders and etc.
The example requires using the SQLite library. or simpler Stdio

You may need to use sudo if not run in place

But calling SQL from within a real time environment that has to execute every one millisecond is a really bad idea. It can't work.

It needs to be called from user space (probably in python) where its not real time

I didn't mean it.
I meant how can I import my library (for example SQLite)
Now If now I just write #include <sqlite.h> - then I get an error.
I just don't know how to put it in the right folders. sqlite.h & sqlite.c in derectory Linuxcnc-dev.
I will explain what I want to implement:
The data that is written to the database appears after the camera is detected object.
Objects appear as the conveyor moves. I want to calculate where this object will be located after some time.
To do this, I attach an encoder and find the real position of the object

Yes a very clever guy..
And consider how precise he is able to position the stock via "cables"