FLTK-FULL - Framework for a desktop GUI - simple, lightweight and independent

[Rava]

FLTK on wikipedia says:

Fast Light Toolkit is a cross-platform widget library for graphical user interfaces, developed by Bill Spitzak and others. Made to accommodate 3D graphics programming, it has an interface to OpenGL, but it is also suitable for general GUI programming.

Stable release 1.3.5 (March 3, 2019; 2 months ago)

For simple, lightweight and independent, may I suggest FLTK:

https://www.fltk.org/index.php

I'd suggest installing FLTK-FULL, and then perhaps looking at some example applications and see if they run on your box:

https://www.fltk.org/links.php?LC+P22+Q

Neat stuff.