From 8e98dc33f5e774c5f791cbc1220c004b45bd339a Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Wed, 27 May 2009 09:03:07 +0000
Subject: [PATCH] svn path=/nixos/branches/modular-nixos/; revision=15742

---
 default.nix | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/default.nix b/default.nix
index ebb9110eb35..de237520ba3 100644
--- a/default.nix
+++ b/default.nix
@@ -34,7 +34,11 @@ in
 
 {
 
-  system = config.system.build.system;
+  # Optionally check wether all config values have corresponding
+  # option declarations.
+  system = pkgs.checker config.system.build.system
+    config.environment.checkConfigurationOptions
+    optionDeclarations config;
 
   nix = config.environment.nix;