diff --git a/riscv/valgrind/default.nix b/riscv/valgrind/default.nix
index 5c372c5..68ecb74 100644
--- a/riscv/valgrind/default.nix
+++ b/riscv/valgrind/default.nix
@@ -5,8 +5,6 @@
   perl,
   gdb,
   cctools,
-  xnu,
-  bootstrap_cmds,
   autoreconfHook,
 }: let
   source = builtins.fromJSON (builtins.readFile ./source.json);
@@ -27,7 +25,7 @@ in
 
     # GDB is needed to provide a sane default for `--db-command'.
     # Perl is needed for `callgrind_{annotate,control}'.
-    buildInputs = [gdb perl] ++ lib.optionals (stdenv.isDarwin) [bootstrap_cmds xnu];
+    buildInputs = [gdb perl];
 
     # Perl is also a native build input.
     nativeBuildInputs = [autoreconfHook perl];