message: Fix Macro to detect clang version on Xcodes Toolchain.
diff: @@ -2139,10 +2139,11 @@ namespace meta
  struct find_if_<list<List...>, Fun,
  void_<integer_sequence<bool, bool(invoke<Fun, List>::type::value)...>>>
  {
  -#if defined(__clang__) && __clang_major__ < 6
  +#if (defined(__clang__) && __clang_major__ < 6) || defined(__apple_build_version__)
  // Explicitly specify extent to avoid https://llvm.org/bugs/show_bug.cgi?id=28385
  + // Track Apples version here: https://en.wikipedia.org/wiki/Xcode#Toolchain_Versions
  static constexpr bool s_v[sizeof...(List)] = {invoke<Fun, List>::type::value...};
  -#else
  +#elif
  static constexpr bool s_v[] = {invoke<Fun, List>::type::value...};
  #endif
  using type =
  