diff --git a/llvm/lib/Support/Unix/Path.inc b/llvm/lib/Support/Unix/Path.inc
index 788460d..c52dc72 100644
--- a/llvm/lib/Support/Unix/Path.inc
+++ b/llvm/lib/Support/Unix/Path.inc
@@ -1462,7 +1462,7 @@ namespace fs {
 std::error_code copy_file(const Twine &From, const Twine &To) {
   std::string FromS = From.str();
   std::string ToS = To.str();
-#if __has_builtin(__builtin_available)
+#if 0
   if (__builtin_available(macos 10.12, *)) {
     // Optimistically try to use clonefile() and handle errors, rather than
     // calling stat() to see if it'll work.