{ config, pkgs, ... }:
{

  # I'm not a zealot about this one.
  nixpkgs.config.allowUnfree = true;

  # List packages installed in system profile. To search by name, run:
  # $ nix-env -qaP | grep wget
  environment.systemPackages =
    with pkgs; [
        vim
	# TODO find a version of the julia package that will install
	# on darwin and add it as an overlay
        python
        emacs
        git
        mercurial
        bash
	podman
	curl
	wget
	jq
	# TODO(jwall): Find a non broken sile package version and add it as an overlay
	spacebar
	coreutils
	watch
	tlaplus
	#tlaplusToolbox
    ];

  # Use a custom configuration.nix location.
  # $ darwin-rebuild switch -I darwin-config=$HOME/.config/nixpkgs/darwin/configuration.nix
  # environment.darwinConfig = "$HOME/.config/nixpkgs/darwin/configuration.nix";

  # Auto upgrade nix package and the daemon service.
  # services.nix-daemon.enable = true;
  # nix.package = pkgs.nix;

  #services.spacebar.enable = true;
  #services.spacebar.package = "${pkgs.spacebar}";

  # Create /etc/bashrc that loads the nix-darwin environment.
  programs.bash.enable = true;  # default shell on catalina
  # programs.fish.enable = true;

  # Used for backwards compatibility, please read the changelog before changing.
  # $ darwin-rebuild changelog
  system.stateVersion = 4;
}