diff --git a/include/__config_site b/include/__config_site
new file mode 100644
index 000000000..c5b0f593e
--- /dev/null
+++ b/include/__config_site
@@ -0,0 +1,40 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP_CONFIG_SITE
+#define _LIBCPP_CONFIG_SITE
+
+/* #undef _LIBCPP_ABI_VERSION */
+/* #undef _LIBCPP_ABI_UNSTABLE */
+/* #undef _LIBCPP_ABI_FORCE_ITANIUM */
+/* #undef _LIBCPP_ABI_FORCE_MICROSOFT */
+/* #undef _LIBCPP_HIDE_FROM_ABI_PER_TU_BY_DEFAULT */
+/* #undef _LIBCPP_HAS_NO_THREADS */
+/* #undef _LIBCPP_HAS_NO_MONOTONIC_CLOCK */
+/* #undef _LIBCPP_HAS_MUSL_LIBC */
+/* #undef _LIBCPP_HAS_THREAD_API_PTHREAD */
+/* #undef _LIBCPP_HAS_THREAD_API_EXTERNAL */
+/* #undef _LIBCPP_HAS_THREAD_API_WIN32 */
+/* #undef _LIBCPP_HAS_THREAD_LIBRARY_EXTERNAL */
+/* #undef _LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS */
+/* #undef _LIBCPP_HAS_NO_VENDOR_AVAILABILITY_ANNOTATIONS */
+/* #undef _LIBCPP_NO_VCRUNTIME */
+/* #undef _LIBCPP_TYPEINFO_COMPARISON_IMPLEMENTATION */
+/* #undef _LIBCPP_ABI_NAMESPACE */
+/* #undef _LIBCPP_HAS_NO_FILESYSTEM_LIBRARY */
+/* #undef _LIBCPP_HAS_PARALLEL_ALGORITHMS */
+/* #undef _LIBCPP_HAS_NO_RANDOM_DEVICE */
+/* #undef _LIBCPP_HAS_NO_LOCALIZATION */
+/* #undef _LIBCPP_HAS_NO_WIDE_CHARACTERS */
+/* #undef _LIBCPP_HAS_NO_INCOMPLETE_FORMAT */
+/* #undef _LIBCPP_HAS_NO_INCOMPLETE_RANGES */
+
+
+
+
+#endif // _LIBCPP_CONFIG_SITE