After 8h finally building is done and I have installed it. PKGCONFIG is there. I could confirm my opencv installation it by running :
pkg-config --libs opencv4
I’ve been struggling with a new thing now, that my simplest code can never seems to find opencv despite including opencv libraries and setting my ld library path. It’s out of topic of this question so maybe it’s not the right place to put it here. It’s been a journey, I hope it gets smoother from here for me.
[update]
nvm everything works now ! congratulation for me i guess. Thanks again for your help and input !