diff --git a/examples/0007.legacy/construct_fstream_from_syscall.cc b/examples/0007.legacy/construct_fstream_from_syscall.cc
index af43d3be..e59420bc 100644
--- a/examples/0007.legacy/construct_fstream_from_syscall.cc
+++ b/examples/0007.legacy/construct_fstream_from_syscall.cc
@@ -73,6 +73,9 @@ FILE* or fstream apis
 			fast_io::mnp::hex0x(__MSVCRT_VERSION__),
 			"\n"
 #endif
+#elif defined(__DARWIN_C_LEVEL)
+			"Darwin ",
+			__DARWIN_C_LEVEL, "\n"
 #endif
 #if defined(_LIBCPP_VERSION)
 																		 "LLVM libc++ ",