Minimum viewer example under Linux

I am trying to create some bindings for a programming language named Nim.

I am struggling to show a bare minimum example in terms of visualization.

I tried to follow the tutorial: occt - minimal viewer setup. Maybe it is not good example, because that is for windows and I am in Linux, but I didn't find a better example.

So far, I covered until the Viewers and Views part of the tutorial. This is the C++ code generated by Nim.

I am having one issue when I run it:

SIGSEGV: Illegal storage access. (Attempt to read from nil?)
[1]    105603 segmentation fault (core dumped)  ./viewer02

The issue seems to be related with the line:

aViewer__viewer4850_36 = opencascade::handle<V3d_Viewer>((new V3d_Viewer(theDriver__viewer4850_28)));

Any clue about the issue?

It would be very helpful for me a bare minimum example working in Linux. Even simpler than the one in the tutorial.