diff --git a/default.nix b/default.nix
new file mode 100644
index 0000000..93ae36a
--- /dev/null
+++ b/default.nix
@@ -0,0 +1,19 @@
+{ pkgs ? import <nixpkgs> {}, shell ? false }:
+let
+    pyenv = pypkgs: with pypkgs; [
+        greenlet twisted cython mysqlclient bcrypt
+    ];
+    buildInputs = [ (pkgs.python2.withPackages pyenv) ];
+in
+if shell then
+  pkgs.mkShell { inherit buildInputs; }
+else
+  pkgs.stdenv.mkDerivation {
+      name = "marmots";
+      src = ./.;
+      inherit buildInputs;
+      installPhase = ''
+        mkdir $out
+        cp -R * $out
+      '';
+  }
diff --git a/shell.nix b/shell.nix
index ae704f3..fd59ae8 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,11 +1 @@
-let
-    pkgs = import <nixpkgs> {};
-    pyenv = pypkgs: with pypkgs; [
-        greenlet twisted cython mysqlclient bcrypt
-    ];
-in
-pkgs.mkShell {
-  buildInputs = [
-      (pkgs.python2.withPackages pyenv)
-  ];
-}
+import ./default.nix { shell = true; }
diff --git a/whiteboard.py b/whiteboard.py
old mode 100644
new mode 100755
index 6cef686..3049be7
--- a/whiteboard.py
+++ b/whiteboard.py
@@ -1,3 +1,5 @@
+#!/usr/bin/env python2
+
 # This file is part of MarMOTS.
 #
 # MarMOTS is free software: you can redistribute it and/or modify it under the terms of the GNU Affero