Added mutter tripple-buffering overlay

flake.nix

@@ -47,7 +47,22 @@
     ...
   }: let
     system = "x86_64-linux";
-    pkgs = nixpkgs.legacyPackages.${system};
+    pkgs = import nixpkgs {
+      inherit system;
+      overlays = [
+        (_final: prev: {
+          gnome = prev.gnome.overrideScope (_gnomeFinal: gnomePrev: {
+            mutter = gnomePrev.mutter.overrideAttrs (_old: {
+              src = pkgs.fetchgit {
+                url = "https://gitlab.gnome.org/vanvugt/mutter.git";
+                rev = "663f19bc02c1b4e3d1a67b4ad72d644f9b9d6970";
+                sha256 = "sha256-I1s4yz5JEWJY65g+dgprchwZuPGP9djgYXrMMxDQGrs=";
+              };
+            });
+          });
+        })
+      ];
+    };
   in {
     nixosConfigurations = {
       Equinox = nixpkgs.lib.nixosSystem {