Add flakes support

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1620901170,
+        "narHash": "sha256-hsJnA0fH6gGzj9KOoolUR+8mw+wNAJC/2SxjZsEq1AI=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "d1601a40c48426ae460eede1675fd1d6ee23e198",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,23 @@
+{
+  description = "vs-overlay";
+  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+  outputs = { self, nixpkgs }:
+    let
+      systems = [ "x86_64-linux" "aarch64-linux" "i686-linux" "x86_64-darwin" ];
+      forAllSystems = f: nixpkgs.lib.genAttrs systems (system: f system);
+      nixpkgsFor = forAllSystems (system:
+        import nixpkgs {
+          inherit system;
+          overlays = [ self.overlay ];
+        }
+      );
+    in
+    {
+      overlay = import ./default.nix;
+      packages = forAllSystems (system: {
+        inherit (nixpkgsFor.${system})
+          getnative
+          vapoursynthPlugins;
+      });
+    };
+}