diff --git a/build.rs b/build.rs
index 4aead477..7836614b 100644
--- a/build.rs
+++ b/build.rs
@@ -428,10 +428,10 @@ fn static_lib_path() -> PathBuf {
   static_lib_dir().join(static_lib_name(""))
 }
 
-fn static_checksum_path() -> PathBuf {
-  let mut t = static_lib_path();
-  t.set_extension("sum");
-  t
+fn static_checksum_path(path: &Path) -> PathBuf {
+  let mut path = path.to_path_buf();
+  path.set_extension("sum");
+  path
 }
 
 fn static_lib_dir() -> PathBuf {
@@ -472,6 +472,12 @@ fn download_file(url: String, filename: PathBuf) {
     return;
   }
 
+  // Checksum (i.e: url) to avoid redownloads
+  match std::fs::read_to_string(static_checksum_path(&filename)) {
+    Ok(c) if c == static_lib_url() => return,
+    _ => {}
+  };
+
   // If there is a `.cargo/.rusty_v8/<escaped URL>` file, use that instead
   // of downloading.
   if let Ok(mut path) = home::cargo_home() {
@@ -528,12 +534,12 @@ fn download_file(url: String, filename: PathBuf) {
   assert!(tmpfile.exists());
 
   // Write checksum (i.e url) & move file
-  std::fs::write(static_checksum_path(), url).unwrap();
+  std::fs::write(static_checksum_path(&filename), url).unwrap();
   copy_archive(&tmpfile.to_string_lossy(), &filename);
   std::fs::remove_file(&tmpfile).unwrap();
 
   assert!(filename.exists());
-  assert!(static_checksum_path().exists());
+  assert!(static_checksum_path(&filename).exists());
   assert!(!tmpfile.exists());
 }
 
@@ -545,11 +551,6 @@ fn download_static_lib_binaries() {
   std::fs::create_dir_all(&dir).unwrap();
   println!("cargo:rustc-link-search={}", dir.display());
 
-  // Checksum (i.e: url) to avoid redownloads
-  match std::fs::read_to_string(static_checksum_path()) {
-    Ok(c) if c == static_lib_url() => return,
-    _ => {}
-  };
   download_file(url, static_lib_path());
 }
 
@@ -621,10 +622,10 @@ fn copy_archive(url: &str, filename: &Path) {
   src.read_exact(&mut header).unwrap();
   src.seek(io::SeekFrom::Start(0)).unwrap();
   if header == [0x1f, 0x8b] {
-    println!("Detected GZIP archive");
+    println!("Detected GZIP archive: {url}");
     decompress_to_writer(&mut src, &mut dst).unwrap();
   } else {
-    println!("Not a GZIP archive");
+    println!("Not a GZIP archive: {url}");
     io::copy(&mut src, &mut dst).unwrap();
   }
 }
@@ -685,12 +686,19 @@ fn print_prebuilt_src_binding_path() {
     println!("cargo:rustc-env=RUSTY_V8_SRC_BINDING_PATH={}", binding);
     return;
   }
+
   let target = env::var("TARGET").unwrap();
   let profile = prebuilt_profile();
-  let src_binding_path = get_dirs()
-    .root
-    .join("gen")
-    .join(format!("src_binding_{}_{}.rs", profile, target));
+  let name = format!("src_binding_{}_{}.rs", profile, target);
+
+  let src_binding_path = get_dirs().root.join("gen").join(name.clone());
+
+  if let Ok(base) = env::var("RUSTY_V8_MIRROR") {
+    let version = env::var("CARGO_PKG_VERSION").unwrap();
+    let url = format!("{}/v{}/{}", base, version, name);
+    download_file(url, src_binding_path.clone());
+  }
+
   println!(
     "cargo:rustc-env=RUSTY_V8_SRC_BINDING_PATH={}",
     src_binding_path.display()
diff --git a/gen/.gitkeep b/gen/.gitkeep
new file mode 100644
index 00000000..e69de29b
diff --git a/tools/ninja_gn_binaries.py b/tools/ninja_gn_binaries.py
index 029be98e..315d33a7 100755
--- a/tools/ninja_gn_binaries.py
+++ b/tools/ninja_gn_binaries.py
@@ -15,7 +15,7 @@ import time
 import http.client
 from v8_deps import Var
 from urllib.error import HTTPError, URLError
-from stat import ST_MODE, S_IXOTH, S_IXGRP, S_IXUSR
+from stat import ST_MODE
 from urllib.request import urlopen
 from urllib.parse import urlparse
 
@@ -27,6 +27,8 @@ def get_platform():
     machine = platform.machine().lower()
     if machine == 'x86_64':
         machine = 'amd64'
+    elif machine == 'aarch64':
+        machine = 'arm64'
 
     return f'{system}-{machine}'