I’m reading princables and practice using c++ by bjarn stroursestrup.
I reached chapter 12 and got stuck because I could not find hi Gui inteface

I have fltk installed on my machine, and I spent time learning CMake. My problem is that I can’t find bjarn’s interface classes.repo https://github.com/BjarneStroustrup/Programming-_Principles_and_Practice_Using_Cpp

These files are contained in his GUI interface

But the repositories I found consist of more classes than those in this image.

can someone provide me with repo to his GUI interface

repo
https://github.com/BjarneStroustrup/Programming-_Principles_and_Practice_Using_Cpp

this repo needs a whole IDE called qt
https://github.com/villevoutilainen/ProgrammingPrinciplesAndPracticeUsingQt/tree/main/PPP