added multi-system-compatibility

flake.nix

@@ -26,22 +26,38 @@
       ...
     }@inputs:
     let
-      system = "aarch64-darwin";
+      systems = [
-      pkgs = nixpkgs.legacyPackages.${system};
+        "x86_64-linux"
+        "aarch64-linux"
+        "x86_64-darwin"
+        "aarch64-darwin"
+      ];
 
-      naerskLib = pkgs.callPackage naersk { };
+      eachSystem = f: nixpkgs.lib.genAttrs systems (system: f system (nixpkgs.legacyPackages.${system}));
     in
     {
-      devShells.${system}.default = devenv.lib.mkShell {
+      devShells = eachSystem (
+        system: pkgs: {
+          default = devenv.lib.mkShell {
             inherit inputs pkgs;
             modules = [
               ./devenv.nix
             ];
           };
+        }
+      );
 
-      packages.${system}.default = naerskLib.buildPackage {
+      packages = eachSystem (
+        system: pkgs:
+        let
+          naerskLib = pkgs.callPackage naersk { };
+        in
+        {
+          default = naerskLib.buildPackage {
             version = "0.1.0";
             src = ./.;
           };
+        }
+      );
     };
 }