opencv3.nix

let
  overlay = self: super: {
    python = super.python.override {
      packageOverrides = pself: psuper: {
        opencv3 = pself.toPythonModule ((super.opencv3.overrideAttrs (oa: rec {
          version = "3.4.3";
          src = self.fetchFromGitHub {
            owner  = "opencv";
            repo   = "opencv";
            rev    = version;
            sha256 = "138q3wiv4g4xvqzsp93xaqayv7kz7bl2vrgppp8jm8w6m25cd4i2";
          };
        })).override {
          enablePython = true;
          pythonPackages = pself;
        });
      };
    };
  };
in
  { pkgs ? import <nixpkgs> { overlays = [ overlay ]; } }:
  pkgs.pythonPackages.opencv3