diff --git a/index.html b/index.html
index a2661c5..19f0e61 100644
--- a/index.html
+++ b/index.html
@@ -4916,14 +4916,19 @@ and line 16 makes that custom GHC available in the development environment.</p>
 <div class="content">
 <pre class="nowrap">$ runghc Main.hs      # Fails; dependency not available
 
-&lt;no location info&gt;: error: [GHC-49196] Can't find Main.hs
-*** Exception: ExitFailure 1
+Main.hs:1:1: error: [GHC-87110]
+    Could not find module ‘Data.List.Extra’.
+    Use :set -v to see a list of the files searched for.
+  |
+1 | import Data.List.Extra
+  | ^^^^^^^^^^^^^^^^^^^^^^
 $ nix develop
-error: Path 'source/recipes/devshell/haskell-pkg/tempwork' in the repository "/home/amy/codeberg/nix-book" is not tracked by Git.
+error:
+       … while updating the lock file of flake 'git+file:///home/amy/codeberg/nix-book?dir=source/recipes/devshell/haskell-pkg/tempwork&amp;ref=refs/heads/pages&amp;rev=2d07f3ceeb4703a873292171d9547ec46817e6c0'
 
-       To make it visible to Nix, run:
+       … while updating the flake input 'pandoc-columns'
 
-       git -C "/home/amy/codeberg/nix-book" add "source/recipes/devshell/haskell-pkg/tempwork"</pre>
+       error: cannot find flake 'flake:pandoc-columns' in the flake registries</pre>
 </div>
 </div>
 </div>
@@ -5633,7 +5638,7 @@ Hello from your flake!</pre>
 </div>
 <div id="footer">
 <div id="footer-text">
-Last updated 2025-09-15 18:39:35 IST
+Last updated 2025-09-15 18:40:34 IST
 </div>
 </div>
 </body>
diff --git a/source/recipes/devshell/haskell-pkg/flake.nix b/source/recipes/devshell/haskell-pkg/flake.nix
index 00ce7dc..5eb2141 100644
--- a/source/recipes/devshell/haskell-pkg/flake.nix
+++ b/source/recipes/devshell/haskell-pkg/flake.nix
@@ -4,7 +4,7 @@
     flake-utils.url = "github:numtide/flake-utils";
   };
 
-  outputs = { self, nixpkgs, flake-utils, pandoc-columns }:
+  outputs = { self, nixpkgs, flake-utils }:
     flake-utils.lib.eachDefaultSystem (system:
       let
         pkgs = import nixpkgs { inherit system; };
diff --git a/source/recipes/devshell/haskell-pkg/tempwork/flake.lock b/source/recipes/devshell/haskell-pkg/tempwork/flake.lock
new file mode 100644
index 0000000..3026d6e
--- /dev/null
+++ b/source/recipes/devshell/haskell-pkg/tempwork/flake.lock
@@ -0,0 +1,60 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1757957081,
+        "narHash": "sha256-7iLovveMGL0xWKV/nBC3L+pgtu/U1ZFdEXz+eCy77GQ=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "594ab976eb33dca9723f7db7b77892456da50813",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/source/recipes/devshell/haskell-pkg/tempwork/flake.nix b/source/recipes/devshell/haskell-pkg/tempwork/flake.nix
index 00ce7dc..5eb2141 100644
--- a/source/recipes/devshell/haskell-pkg/tempwork/flake.nix
+++ b/source/recipes/devshell/haskell-pkg/tempwork/flake.nix
@@ -4,7 +4,7 @@
     flake-utils.url = "github:numtide/flake-utils";
   };
 
-  outputs = { self, nixpkgs, flake-utils, pandoc-columns }:
+  outputs = { self, nixpkgs, flake-utils }:
     flake-utils.lib.eachDefaultSystem (system:
       let
         pkgs = import nixpkgs { inherit system; };