How to set up opencv4 with python bindings and a GUI

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As per @igel solution. I’ve put this .env thing into conifguration file, as follows:

{ config, pkgs, ... }:
let python =
    let
    packageOverrides = self:
    super: {
      opencv4 = super.opencv4.override {
        enableGtk2 = true;
        gtk2 = pkgs.gtk2;
        #enableFfmpeg = true; #here is how to add ffmpeg and other compilation flags
        #ffmpeg_3 = pkgs.ffmpeg-full;
        };
    };
    in
      pkgs.python3.override {inherit packageOverrides; self = python;};
in
{
environment.systemPackages = with pkgs; [
  (python.withPackages(ps: with ps; [
    opencv4
  ]))
];
}

Hope that works for you @573 !

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