running setup

flake.lock

@@ -0,0 +1,48 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1646258393,
+        "narHash": "sha256-mKDoCi5Baqainjf0Nx6oTPhaxKQdj4P17XTdhTtXGRA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "ed02c2ba0384b2800db41333045a6fb781f12aac",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-21.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "sops-nix": "sops-nix"
+      }
+    },
+    "sops-nix": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1645891244,
+        "narHash": "sha256-Pu3a97Zn0PpWi/prTyD9TulCmxyeVnlqofor+yScRD8=",
+        "owner": "Mic92",
+        "repo": "sops-nix",
+        "rev": "afb0d686dced029ea720c466f693c12ebfd4107b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "Mic92",
+        "repo": "sops-nix",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

hosts/birne/configuration.nix

@@ -44,8 +44,12 @@
   # services.xserver.enable = true;
 
   nixpkgs.config.allowUnfree = true;
-  
+  nix = {
-
+    package = pkgs.nixUnstable; # or versioned attributes like nix_2_4
+    extraOptions = ''
+      experimental-features = nix-command flakes
+    '';
+  };  
   # Configure keymap in X11
   # services.xserver.layout = "us";
   # services.xserver.xkbOptions = "eurosign:e";