diff --git a/src/hb.hh b/src/hb.hh
index d7fef1246..9043de403 100644
--- a/src/hb.hh
+++ b/src/hb.hh
@@ -215,59 +215,6 @@ extern "C" int hb_memalign_impl(void **memptr, size_t alignment, size_t size);
  * Compiler attributes
  */
 
-/* https://github.com/harfbuzz/harfbuzz/issues/1634 */
-#if __cplusplus < 201103L && !defined(_MSC_VER)
-
-#ifndef nullptr
-#define nullptr NULL
-#endif
-
-#ifndef constexpr
-#define constexpr const
-#endif
-
-#ifndef static_assert
-#define static_assert(e, msg) \
-	HB_UNUSED typedef int HB_PASTE(static_assertion_failed_at_line_, __LINE__) [(e) ? 1 : -1]
-#endif // static_assert
-
-#if defined(__GNUC__)
-#if (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 8))
-#define thread_local __thread
-#endif
-#else
-#define thread_local
-#endif
-
-template <typename T>
-struct _hb_alignof
-{
-  struct s
-  {
-    char c;
-    T t;
-  };
-  static constexpr size_t value = offsetof (s, t);
-};
-#ifndef alignof
-#define alignof(x) (_hb_alignof<x>::value)
-#endif
-
-/* https://github.com/harfbuzz/harfbuzz/issues/1127 */
-#ifndef explicit_operator
-#define explicit_operator operator
-#endif
-
-#else /* __cplusplus >= 201103L */
-
-/* https://github.com/harfbuzz/harfbuzz/issues/1127 */
-#ifndef explicit_operator
-#define explicit_operator explicit operator
-#endif
-
-#endif /* __cplusplus < 201103L */
-
-
 #if (defined(__GNUC__) || defined(__clang__)) && defined(__OPTIMIZE__)
 #define likely(expr) (__builtin_expect (!!(expr), 1))
 #define unlikely(expr) (__builtin_expect (!!(expr), 0))