std::align not supported by g++4.9

While learning about alignment issues etc, I realized that my implementation of g++4.9 (macports OS X) does not have support for `std::align`. If I try to compile (with `-std=c++11`) this example code from http://www.cplusplus.com/reference/memory/align/ ``` // align example #include <iostream> #include <memory> int main() { char buffer[] = "------------------------"; void * pt = buffer; std::size_t space = sizeof(buffer) - 1; while ( std::align(alignof(int), sizeof(char), pt, space) ) { char* temp = static_cast<char*>(pt); *temp = '*'; ++temp; space -= sizeof(char); pt = temp; } std::cout << buffer << '\n'; return 0; } ``` the compiler spits out the error ``` error: 'align' is not a member of 'std' ``` This seems strange as g++ seems to have implemented alignment support since g++4.8, https://gcc.gnu.org/projects/cxx0x.html (N2341) The code compiles under clang++ without any problems. Is this a well known issue of g++ that I am not aware of? The online compilers that I tested (ideone and coliru) reject the code also.