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+# SPDX-FileCopyrightText: Copyright 2025 Alexandre Jesus <https://adbjesus.com>
+#
+# SPDX-License-Identifier: CC0-1.0
+
+{
+  description = "Development shell for Advent of Code 2025";
+
+  inputs = {
+    nixpkgs = {
+      url = "github:nixos/nixpkgs/nixos-unstable";
+    };
+  };
+
+  outputs = { self, nixpkgs }:
+    let
+      system = "x86_64-linux";
+      pkgs = import nixpkgs { inherit system; };
+    in {
+      devShells.${system}.default = pkgs.mkShell {
+        nativeBuildInputs = with pkgs; [
+          dune_3
+          reuse
+        ] ++ (with ocamlPackages; [
+          ocaml
+          ocaml-lsp
+        ]);
+      };
+    };
+}