use beta dash-to-dock

modules/gnome.nix

@@ -18,7 +18,7 @@ in
     environment.systemPackages = with pkgs; [
       gnome3.gnome-tweaks
       gnomeExtensions.appindicator
-      gnomeExtensions.dash-to-dock
+      (callPackage ../pkgs/dash-to-dock { })
       gnomeExtensions.dash-to-panel
       numix-icon-theme
       qemu_kvm

pkgs/dash-to-dock/default.nix

@@ -0,0 +1,38 @@
+{ lib
+, stdenv
+, fetchFromGitHub
+, glib
+, gettext
+, sassc
+}:
+
+stdenv.mkDerivation rec {
+  pname = "gnome-shell-dash-to-dock";
+  version = "69";
+
+  src = fetchFromGitHub {
+    owner = "ewlsh";
+    repo = "dash-to-dock";
+    rev = "a2d40e2a06117617bcbc5f85608c895c7734604e";
+    hash = "sha256-Kb4TlZAjXu7M/xL9maTZgJT19+PCopB5U9ZRXeaN/mM=";
+  };
+
+  nativeBuildInputs = [
+    glib
+    gettext
+    sassc
+  ];
+
+  makeFlags = [
+    "INSTALLBASE=${placeholder "out"}/share/gnome-shell/extensions"
+  ];
+
+  uuid = "dash-to-dock@micxgx.gmail.com";
+
+  meta = with lib; {
+    description = "A dock for the Gnome Shell";
+    homepage = "https://micheleg.github.io/dash-to-dock/";
+    license = licenses.gpl2;
+    maintainers = with maintainers; [ eperuffo jtojnar ];
+  };
+}