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-rw-r--r--include/stddef.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/include/stddef.h b/include/stddef.h
index e3b98e5..275e53c 100644
--- a/include/stddef.h
+++ b/include/stddef.h
@@ -29,7 +29,9 @@
* way), use to indicate that a pointer does not point
* to anything.
*/
-#define NULL ((void*)0)
+#ifndef NULL
+# define NULL ((void*)0)
+#define
/**