flake.nix for Common Lisp game development

flake.nix

{
  inputs = {
    utils.url = "github:numtide/flake-utils";
    nixgl.url = "github:nix-community/nixGL";
  };
  outputs = { self, nixgl, nixpkgs, utils }:
    utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs {
          system = system;
          overlays = [ nixgl.overlay ];
        };
      in {
        devShell = pkgs.mkShell {
          nativeBuildInputs = with pkgs;
            [
              (sbcl.withPackages (ps:
                with ps; [
                  pkgs.nixgl.nixGLIntel
                  sbclPackages.cl-opengl
                  sbclPackages.sdl2
                  sbclPackages.sdl2-ttf
                  sbclPackages.sdl2-image
                  sbclPackages.trivial-garbage
                  sbclPackages.cl-liballegro
                ]))
            ];
          shellHook = ''
            library_path="$LD_LIBRARY_PATH"
            export $(env -i $(which nixGLIntel) $(which printenv))
            export LD_LIBRARY_PATH="$library_path:$LD_LIBRARY_PATH"
          '';
        };
      });
}