* You should not attempt to use it directly.
*/
-#ifndef _CXX_ALLOCATOR_H
-#define _CXX_ALLOCATOR_H 1
+#ifndef _GLIBCXX_CXX_ALLOCATOR_H
+#define _GLIBCXX_CXX_ALLOCATOR_H 1
// Define mt_allocator as the base class to std::allocator.
#include <ext/mt_allocator.h>