Switch darktable to unstable channel

So i can get on the 5.4 release.

alex/personal.nix

@@ -1,5 +1,11 @@
 { config, pkgs, inputs, ... }:
 
+let
+  unstable = import inputs.nixpkgs-unstable {
+    system = pkgs.system;
+    config.allowUnfree = true;
+  };
+in
 {
   home.packages = with pkgs; [
     foliate
@@ -18,14 +24,14 @@
 
     (symlinkJoin {
      name = "darktable";
-     paths = [ darktable ];
+     paths = [ unstable.darktable ];
      nativeBuildInputs = [ makeWrapper ];
      postBuild = ''
      # Remove the symlink to the original binary
      rm $out/bin/darktable
 
      # Create a wrapper that points to the cached original
-     makeWrapper ${darktable}/bin/darktable $out/bin/darktable \
+     makeWrapper ${unstable.darktable}/bin/darktable $out/bin/darktable \
      --set GDK_BACKEND wayland
      '';
      })

flake.lock

@@ -74,6 +74,22 @@
         "type": "github"
       }
     },
+    "nixpkgs-unstable": {
+      "locked": {
+        "lastModified": 1766651565,
+        "narHash": "sha256-QEhk0eXgyIqTpJ/ehZKg9IKS7EtlWxF3N7DXy42zPfU=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "3e2499d5539c16d0d173ba53552a4ff8547f4539",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "nixpkgs_2": {
       "locked": {
         "lastModified": 1765838191,
@@ -94,7 +110,8 @@
       "inputs": {
         "home-manager": "home-manager",
         "locutus": "locutus",
-        "nixpkgs": "nixpkgs_2"
+        "nixpkgs": "nixpkgs_2",
+        "nixpkgs-unstable": "nixpkgs-unstable"
       }
     },
     "systems": {

flake.nix

@@ -4,6 +4,7 @@
   inputs = {
     # NixOS official package source
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.11";
+    nixpkgs-unstable.url = "github:NixOS/nixpkgs/nixos-unstable";
     home-manager = {
       url = "github:nix-community/home-manager/release-25.11";
       # The `follows` keyword in inputs is used for inheritance.