it compiles!

kernel/build.rs

@@ -1,7 +1,9 @@
+use std::process::Command;
+use std::{env, path::Path};
+
 fn main() {
-    let arch = std::env::var("CARGO_CFG_TARGET_ARCH").unwrap();
-    // Tell cargo to pass the linker script to the linker..
-    println!("cargo:rustc-link-arg=-Tlinker-{arch}.ld");
-    // ..and to re-run if it changes.
-    println!("cargo:rerun-if-changed=linker-{arch}.ld");
-}
+    // Tell cargo to rerun if these files change
+    println!("cargo:rerun-if-changed=src");
+    println!("cargo:rerun-if-changed=linker.ld");
+    println!("cargo:rerun-if-changed=../config/limine.conf");
+}