diff --git a/codex-rs/.cargo/config.toml b/codex-rs/.cargo/config.toml
index 5d5eb8fd6f..57e4e36295 100644
--- a/codex-rs/.cargo/config.toml
+++ b/codex-rs/.cargo/config.toml
@@ -9,3 +9,6 @@ rustflags = ["-C", "link-arg=/STACK:8388608", "-C", "link-arg=/arm64hazardfree"]
 
 [target.'cfg(all(windows, target_env = "gnu"))']
 rustflags = ["-C", "link-arg=-Wl,--stack,8388608"]
+
+[target.'cfg(target_os = "macos")']
+rustflags = ["-C", "link-arg=-ObjC"]
diff --git a/codex-rs/app-server/build.rs b/codex-rs/app-server/build.rs
deleted file mode 100644
index abccc48bb6..0000000000
--- a/codex-rs/app-server/build.rs
+++ /dev/null
@@ -1,5 +0,0 @@
-fn main() {
-    if std::env::var("CARGO_CFG_TARGET_OS").as_deref() == Ok("macos") {
-        println!("cargo:rustc-link-arg=-ObjC");
-    }
-}
diff --git a/codex-rs/cli/build.rs b/codex-rs/cli/build.rs
deleted file mode 100644
index abccc48bb6..0000000000
--- a/codex-rs/cli/build.rs
+++ /dev/null
@@ -1,5 +0,0 @@
-fn main() {
-    if std::env::var("CARGO_CFG_TARGET_OS").as_deref() == Ok("macos") {
-        println!("cargo:rustc-link-arg=-ObjC");
-    }
-}
diff --git a/codex-rs/codex-api/build.rs b/codex-rs/codex-api/build.rs
deleted file mode 100644
index abccc48bb6..0000000000
--- a/codex-rs/codex-api/build.rs
+++ /dev/null
@@ -1,5 +0,0 @@
-fn main() {
-    if std::env::var("CARGO_CFG_TARGET_OS").as_deref() == Ok("macos") {
-        println!("cargo:rustc-link-arg=-ObjC");
-    }
-}