{
  inputs.nixpkgsUnstable.url = "github:nixos/nixpkgs";

  outputs = { self, nixpkgs, nixpkgsUnstable, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs {
          inherit system;
          config.cudaSupport = true;
        };
        pkgsUnstable = import nixpkgsUnstable {
          inherit system;
          config.cudaSupport = true;
          config.allowUnfreePredicate = pkg:
            builtins.elem (nixpkgs.lib.getName pkg) [ "cudatoolkit" ];
        };
      in {
        devShell = pkgs.mkShell {
          packages = (with pkgs; [ clang-tools gdb octave ])
            ++ (with pkgsUnstable.cudaPackages_12; [ cudatoolkit ]);
        };
      });
}