overlays setup

overlays.nix

@@ -0,0 +1,18 @@
+final: prev:
+let overlays = (import <nixpkgs/nixos> { }).config.nixpkgs.overlays;
+in {
+  gnome = prev.gnome.overrideScope' (gnomeFinal: gnomePrev: {
+    mutter = gnomePrev.mutter.overrideAttrs (old: {
+      src = prev.pkgs.fetchgit {
+        url = "https://gitlab.gnome.org/vanvugt/mutter.git";
+        # GNOME 45: triple-buffering-v4-45
+        rev = "0b896518b2028d9c4d6ea44806d093fd33793689";
+        sha256 = "sha256-mzNy5GPlB2qkI2KEAErJQzO//uo8yO0kPQUwvGDwR4w=";
+      };
+    });
+  });
+  blanket = prev.sl.overrideAttrs (old: {
+    version = "0.7.0";
+    src = prev.fetchFromGitHub { hash = ""; };
+  });
+}