--- a/build/config/clang/clang.gni
+++ b/build/config/clang/clang.gni
@@ -53,2 +53,5 @@
 declare_args() {
+  system_clang_resource_dir = ""
+  system_clang_builtin_library = ""
+
   # Indicates if the build should use the Chrome-specific plugins for enforcing
--- a/build/config/clang/BUILD.gn
+++ b/build/config/clang/BUILD.gn
@@ -239,3 +239,8 @@
       _lib_file = "${_prefix}clang_rt.${_libname}${_suffix}.${_ext}"
-      libs = [ "$_clang_lib_dir/$_dir/$_lib_file" ]
+      if (_libname == "builtins" && system_clang_builtin_library != "") {
+        not_needed([ "_clang_lib_dir", "_lib_file", "_dir" ])
+        libs = [ system_clang_builtin_library ]
+      } else {
+        libs = [ "$_clang_lib_dir/$_dir/$_lib_file" ]
+      }
     }
--- a/build/rust/rust_bindgen_generator.gni
+++ b/build/rust/rust_bindgen_generator.gni
@@ -233,3 +233,8 @@
-    clang_resource_dir =
-        rebase_path(clang_base_path + "/lib/clang/" + clang_version,
-                    root_build_dir)
+    if (system_clang_resource_dir != "") {
+      clang_resource_dir =
+          rebase_path(system_clang_resource_dir, root_build_dir)
+    } else {
+      clang_resource_dir =
+          rebase_path(clang_base_path + "/lib/clang/" + clang_version,
+                      root_build_dir)
+    }