--- /dev/null
+#ifndef __CONFIG_H
+#define __CONFIG_H
+
+/* malloc_size() */
+#ifdef __APPLE__
+#include <malloc/malloc.h>
+#define HAVE_MALLOC_SIZE
+#define redis_malloc_size(p) malloc_size(p)
+#endif
+
+/* define redis_fstat to fstat or fstat64() */
+#ifdef __APPLE__
+#define redis_fstat fstat64
+#define redis_stat stat64
+#else
+#define redis_fstat fstat
+#define redis_stat stat
+#endif
+
+#endif