Compatibility, bringing Sumireko into the fold. Deprecate katexprs.

overlays/darwin.nix

@@ -0,0 +1,27 @@
+{ inputs, system ? builtins.currentSystem, ... }@args:
+
+let
+  pkgs = import inputs.nixpkgs-darwin {
+    inherit system;
+    overlays = [
+      (import ./nur { inherit inputs; })
+      (import inputs.emacs-overlay)
+      (import ./dns { inherit inputs; })
+      (import ./local)
+      (import ./lib)
+    ] ++ (map (path: import "${path}/overlay.nix") [
+      inputs.arcexprs
+      inputs.anicca
+    ]);
+    config = {
+      allowUnfree = true;
+      allowBroken = true;
+      allowUnsupportedSystem = true;
+      permittedInsecurePackages = [
+        "ffmpeg-3.4.8"
+        "ffmpeg-2.8.17"
+      ];
+    };
+  };
+in
+pkgs