diff --git a/Makefile b/Makefile
index d0fc5db..4f0c5d0 100644
--- a/Makefile
+++ b/Makefile
@@ -1,21 +1,3 @@
-HOSTNAME := $(shell hostname -s)
-
-all:
-	if [[ "`uname`" == 'Darwin' ]]; then \
-		echo macOS; \
-		make macos-system; \
-	else \
-		echo NixOS; \
-		make nixos-system; \
-	fi
-
-nixos-system:
-	nixos-rebuild --use-remote-sudo switch -j auto
-
-macos-system:
-	sudo ls # cache sudo
-	$$(nix build --extra-experimental-features "flakes nix-command"  .#darwinConfigurations.$(HOSTNAME).system --no-link --json | nix --extra-experimental-features "flakes nix-command" run ${WITHEXP} nixpkgs#jq -- -r '.[].outputs.out')/sw/bin/darwin-rebuild switch --flake .
-
 # Update the primary inputs
 #
 # Typically run as: `make update all` followed by a git commit.
diff --git a/README.md b/README.md
index f4402fa..46d3de3 100644
--- a/README.md
+++ b/README.md
@@ -3,9 +3,9 @@ This repository contains the Nix / NixOS configuration for all of my systems. St
 To build,
 
 ```sh
-# First, edit nixosConfigurations or darwinConfigurations in flake.nix to add
-# your system's hostname. And then change `userName` to your username.
-make
+# First, edit nixosConfigurations in flake.nix to add your system's hostname.
+# And then change `userName` to your username.
+nix run
 ```
 
 ## Install notes
@@ -18,14 +18,14 @@ make
     - Windows (via WSL): https://github.com/nix-community/NixOS-WSL
   - Clone this repo at `/etc/nixos`
   - Edit `flake.nix` and add your Linux's hostname in the `nixosConfigurations` set, as well as update `userName`.
-  - Run `make`. That's it. Re-open your shell.
+  - Run `nix run`. That's it. Re-open your shell.
 - macOS: 
     - Install Nix normally (multi-user)
     - Install [nix-darwin](https://github.com/LnL7/nix-darwin) 
         - This will create a `~/.nixpkgs/darwin-configuration.nix`, but we do not need that. 
     - Clone this repo anywhere
     - Edit `flake.nix` and add your Mac's [hostname](https://support.apple.com/en-ca/guide/mac-help/mchlp2322/mac) in the `darwinConfigurations` set, as well update `userName`.
-    - Run `make`.[^cleanup] That's it. Re-open your shell.
+    - Run `nix run`.[^cleanup] That's it. Re-open your shell.
 
 [^cleanup]: You might have to `rm -rf /etc/nix/nix.conf`, so our flake.nix can do its thing.
 
diff --git a/flake.nix b/flake.nix
index b26110e..ba27e6b 100644
--- a/flake.nix
+++ b/flake.nix
@@ -163,14 +163,8 @@
           };
         in
         {
-          # These are indexed, by convention, using hostnames.
-          # For example, if `sky.local` is the hostname of your Mac, then use
-          # `sky` here.
-          air = defaultMacosSystem;
-          sky = defaultMacosSystem;
+          default = defaultMacosSystem;
         };
-
-
     } //
     inputs.flake-utils.lib.eachSystem [ "x86_64-linux" "aarch64-darwin" ] (system:
       let pkgs = nixpkgs.legacyPackages.${system};
@@ -184,6 +178,32 @@
           ];
         };
         formatter = pkgs.nixpkgs-fmt;
+        apps.default =
+          let
+            bashCmdApp = name: cmd: {
+              type = "app";
+              program =
+                let
+                  pkgs = inputs.nixpkgs.legacyPackages.aarch64-darwin;
+                in
+                (pkgs.writeShellApplication {
+                  inherit name;
+                  text = ''
+                    set -x
+                    ${cmd}
+                  '';
+                }) + "/bin/${name}";
+            };
+          in
+          if system == "aarch64-darwin" then
+            bashCmdApp "darwin" ''
+              ${self.darwinConfigurations.default.system}/sw/bin/darwin-rebuild \
+                 switch --flake ${self}#default
+            ''
+          else
+            bashCmdApp "linux" ''
+              nixos-rebuild --use-remote-sudo switch -j auto
+            '';
       }
     );