{
  description = "Ivy Bridge Custom Mesa";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    mesa-src = {
      url = "git+https://gitlab.freedesktop.org/mesa/mesa?rev=1a8953c9562d779f2d2730900a85ab5f446fff12";
      flake = false;
    };
  };

  outputs = { self, nixpkgs, mesa-src }: 
  let
    system = "x86_64-linux";
    pkgs = import nixpkgs { inherit system; };
  in {
    packages.${system}.mesa-custom = pkgs.mesa.overrideAttrs (old: {
      src = mesa-src;
      patches = [ ./hd4000-custom.patch ];
    });
  };
}