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-rw-r--r--lib/Headers/stddef.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/Headers/stddef.h b/lib/Headers/stddef.h
index 52962248f6..a8d6bf4148 100644
--- a/lib/Headers/stddef.h
+++ b/lib/Headers/stddef.h
@@ -53,7 +53,9 @@ typedef __WCHAR_TYPE__ wchar_t;
#endif
#undef NULL
-#ifdef __cplusplus
+#if defined(__APPLE__) && defined(__DARWIN_NULL)
+# define NULL __DARWIN_NULL
+#elif defined(__cplusplus)
# if !defined(__MINGW32__) && !defined(_MSC_VER)
# define NULL __null
# else