diff --git a/darwin-configuration.nix b/darwin-configuration.nix
new file mode 100644
index 0000000..31a3dff
--- /dev/null
+++ b/darwin-configuration.nix
@@ -0,0 +1,49 @@
+{ 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;
+}