add nur

configuration.nix

@@ -2,7 +2,7 @@
 # your system.  Help is available in the configuration.nix(5) man page
 # and in the NixOS manual (accessible by running ‘nixos-help’).
 
-{ config, pkgs, lib, modulesPath, ... }:
+{ config, pkgs, lib, modulesPath, inputs, ... }:
 
 {
 
@@ -13,5 +13,11 @@
   services.sshd.enable = true;
 
   networking.hostName = "mysystem";
+
+  nixpkgs.overlays = [ inputs.nur.overlay ];
+
+  environment.systemPackages = with pkgs; [
+    pkgs.nur.repos.mic92.hello-nur
+  ];
 }
 

flake.lock

@@ -16,9 +16,25 @@
         "type": "github"
       }
     },
+    "nur": {
+      "locked": {
+        "lastModified": 1604808696,
+        "narHash": "sha256-yJRRZEBzvfuDUMarWCbD6ehZd1u3rHqA9nK3OJOE30s=",
+        "owner": "nix-community",
+        "repo": "NUR",
+        "rev": "3189c40da661eefc0c604f7f50df4956cf542a25",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "NUR",
+        "type": "github"
+      }
+    },
     "root": {
       "inputs": {
-        "nixpkgs": "nixpkgs"
+        "nixpkgs": "nixpkgs",
+        "nur": "nur"
       }
     }
   },

flake.nix

@@ -4,6 +4,7 @@
 
   inputs = {
     nixpkgs = { url = "github:nixos/nixpkgs/nixos-unstable"; };
+    nur = { url = "github:nix-community/NUR"; };
   };
 
   outputs = inputs:
@@ -18,6 +19,7 @@
 
           /* ignore */ ignoreme # ignore this; don't include it; it is a small helper for this example
         ];
+        specialArgs = { inherit inputs; };
       };
     };
   };