rcp: add missing framework on darwin

pkgs/by-name/rc/rcp/package.nix

@@ -1,6 +1,8 @@
 { lib
+, stdenv
 , fetchFromGitHub
 , rustPlatform
+, darwin
 }:
 
 rustPlatform.buildRustPackage rec {
@@ -14,6 +16,10 @@ rustPlatform.buildRustPackage rec {
     hash = "sha256-kVO2WMwB/Lv4fCcdXaWL/Gfmenky6uMNVrUwhWU9y7A=";
   };
 
+  buildInputs = lib.optionals stdenv.isDarwin (with darwin.apple_sdk.frameworks; [
+    IOKit
+  ]);
+
   cargoHash = "sha256-Pa8YgFAT9nue/QLhHQm6PlTJU/myK60UcND5TthMOxc=";
 
   RUSTFLAGS = "--cfg tokio_unstable";