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-rw-r--r--lib/Support/Unix/Path.inc2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/Support/Unix/Path.inc b/lib/Support/Unix/Path.inc
index e80880c6b3cb..27c8a1bc9b74 100644
--- a/lib/Support/Unix/Path.inc
+++ b/lib/Support/Unix/Path.inc
@@ -1200,7 +1200,7 @@ namespace fs {
/// implementation.
std::error_code copy_file(const Twine &From, const Twine &To) {
uint32_t Flag = COPYFILE_DATA;
-#if __has_builtin(__builtin_available)
+#if __has_builtin(__builtin_available) && defined(COPYFILE_CLONE)
if (__builtin_available(macos 10.12, *)) {
bool IsSymlink;
if (std::error_code Error = is_symlink_file(From, IsSymlink))