diff --git a/dylint/build.rs b/dylint/build.rs
index f96b676f..297d2dcf 100644
--- a/dylint/build.rs
+++ b/dylint/build.rs
@@ -31,7 +31,7 @@ fn write_dylint_driver_manifest_dir() {
     {
         "None".to_owned()
     } else {
-        let path_buf = dylint_manifest_dir.join("../driver");
+        let path_buf = Path::new("@DRIVER_DIR@");
 
         // smoelius: Ensure the path exists at build time.
         assert!(path_buf.is_dir(), "{path_buf:?} is not a directory");
diff --git a/internal/src/cargo.rs b/internal/src/cargo.rs
index 8532d68c..4e7f715c 100644
--- a/internal/src/cargo.rs
+++ b/internal/src/cargo.rs
@@ -14,16 +14,7 @@ use std::{
 pub use home::cargo_home;
 
 static STABLE_CARGO: Lazy<PathBuf> = Lazy::new(|| {
-    let mut command = Command::new("rustup");
-    // smoelius: Rustup 1.27.1 doesn't properly handle the case where the toolchain is specified via
-    // both the `RUSTUP_TOOLCHAIN` environment variable and the command line (e.g., `+stable`). This
-    // bug is fixed in Rustup's `master` branch, though.
-    command.env_remove("RUSTUP_TOOLCHAIN");
-    command.args(["+stable", "which", "cargo"]);
-    let output = command.logged_output(true).unwrap();
-    assert!(output.status.success());
-    let stdout = String::from_utf8(output.stdout).unwrap();
-    PathBuf::from(stdout.trim_end())
+    PathBuf::from("@STABLE_CARGO@")
 });
 
 bitflags! {
diff --git a/internal/src/rustup.rs b/internal/src/rustup.rs
index fb72a3fa..9b320670 100644
--- a/internal/src/rustup.rs
+++ b/internal/src/rustup.rs
@@ -15,7 +15,7 @@ impl SanitizeEnvironment for Command {
     fn sanitize_environment(&mut self) -> &mut Self {
         self.env_remove(env::CARGO);
         self.env_remove(env::RUSTC);
-        self.env_remove(env::RUSTUP_TOOLCHAIN);
+        // self.env_remove(env::RUSTUP_TOOLCHAIN);
         self
     }
 }
@@ -23,31 +23,11 @@ impl SanitizeEnvironment for Command {
 // smoelius: Consider carefully whether you need to call this function! In most cases, the toolchain
 // you want is not the one returned by rustup.
 pub fn active_toolchain(path: &Path) -> Result<String> {
-    let output = Command::new("rustup")
-        .sanitize_environment()
-        .current_dir(path)
-        .args(["show", "active-toolchain"])
-        .logged_output(true)?;
-    let stdout = std::str::from_utf8(&output.stdout)?;
-    stdout
-        .split_once(' ')
-        .map(|(s, _)| s.to_owned())
-        .ok_or_else(|| anyhow!("Could not determine active toolchain"))
+    Ok(String::from("@RUST_TOOLCHAIN@"))
 }
 
 pub fn toolchain_path(path: &Path) -> Result<PathBuf> {
-    let output = Command::new("rustup")
-        .sanitize_environment()
-        .current_dir(path)
-        .args(["which", "rustc"])
-        .logged_output(true)?;
-    let stdout = std::str::from_utf8(&output.stdout)?;
-    let path = PathBuf::from(stdout);
-    // smoelius: `path` should end with `/bin/rustc`.
-    path.ancestors()
-        .nth(2)
-        .map(Into::into)
-        .ok_or_else(|| anyhow!("Could not get ancestor"))
+    Ok(PathBuf::from("@RUST_TOOLCHAIN_PATH@"))
 }
 
 pub fn is_rustc<T: AsRef<OsStr> + ?Sized>(arg: &T) -> bool {