diff --git a/source/recipes/devshell/haskell-pkg/tempwork/Main.hs b/source/recipes/devshell/haskell-pkg/tempwork/Main.hs
new file mode 100644
index 0000000..4fe2929
--- /dev/null
+++ b/source/recipes/devshell/haskell-pkg/tempwork/Main.hs
@@ -0,0 +1,6 @@
+import Data.List.Extra
+
+main :: IO ()
+main = do
+  print $ lower "ABCDE"
+  print $ upper "XYZ"
diff --git a/source/recipes/devshell/nixpkg/tempwork/flake.lock b/source/recipes/devshell/haskell-pkg/tempwork/flake.lock
similarity index 100%
rename from source/recipes/devshell/nixpkg/tempwork/flake.lock
rename to source/recipes/devshell/haskell-pkg/tempwork/flake.lock
diff --git a/source/recipes/devshell/nixpkg/tempwork/flake.nix b/source/recipes/devshell/haskell-pkg/tempwork/flake.nix
similarity index 75%
rename from source/recipes/devshell/nixpkg/tempwork/flake.nix
rename to source/recipes/devshell/haskell-pkg/tempwork/flake.nix
index 83db46c..5eb2141 100644
--- a/source/recipes/devshell/nixpkg/tempwork/flake.nix
+++ b/source/recipes/devshell/haskell-pkg/tempwork/flake.nix
@@ -8,11 +8,12 @@
     flake-utils.lib.eachDefaultSystem (system:
       let
         pkgs = import nixpkgs { inherit system; };
+        customGhc = pkgs.haskellPackages.ghcWithPackages (p: with p; [ p.extra ]);
       in
       {
         devShells = rec {
           default = pkgs.mkShell {
-            packages = [ pkgs.cowsay ];
+	          buildInputs = [ customGhc ];
           };
         };
       }