Reset from zero

overlays/default.nix

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+# This file defines overlays
+{ inputs, ... }:
+{
+  # This one brings our custom packages from the 'pkgs' directory
+  additions = final: _prev: {
+    # nest everything under a namespace that's not likely to collide
+    # with anything in nixpkgs
+    local-pkgs = import ../pkgs { pkgs = final; };
+  };
+
+  # This one contains whatever you want to overlay
+  # You can change versions, add patches, set compilation flags, anything really.
+  # https://nixos.wiki/wiki/Overlays
+  modifications = final: prev: {
+    # example = prev.example.overrideAttrs (oldAttrs: rec {
+    # ...
+    # });
+  };
+
+  unstable-packages = final: _prev: {
+    # use 'pkgs.unstable'
+    unstable = import inputs.nixpkgs-unstable {
+      system = final.system;
+      config.allowUnfree = true;
+    };
+
+    # use 'pkgs.stable'
+    stable = import inputs.nixpkgs-stable {
+      system = final.system;
+      config.allowUnfree = true;
+    };
+  };
+}