diff --git a/conways-game-of-life.cabal b/conways-game-of-life.cabal
index ef3d29c..ce341a4 100644
--- a/conways-game-of-life.cabal
+++ b/conways-game-of-life.cabal
@@ -11,6 +11,7 @@ executable main
   other-modules:  GOL.Rule,
                   GOL.Space,
                   GOL.Engine,
+                  Graphics.GlossUtils,
                   Graphics.Engine
   build-depends:  base,
                   vector,
diff --git a/flake.nix b/flake.nix
index c8723ae..e57aa50 100644
--- a/flake.nix
+++ b/flake.nix
@@ -40,6 +40,10 @@
             hlint
             pkgs.haskell-language-server
             pkgs.ormolu
+
+            pkgs.mesa
+            pkgs.mesa_glu
+            pkgs.freeglut
           ];
           inputsFrom = builtins.attrValues self.packages.${system};
         };