#ifndef _GLIBCXX_PROFILE_UNORDERED_SET
#define _GLIBCXX_PROFILE_UNORDERED_SET 1
-#ifndef __GXX_EXPERIMENTAL_CXX0X__
+#if __cplusplus < 201103L
# include <bits/c++0x_warning.h>
#else
# include <unordered_set>
#undef _GLIBCXX_BASE
#undef _GLIBCXX_STD_BASE
-#endif // __GXX_EXPERIMENTAL_CXX0X__
+#endif // C++11
#endif