Compile error with GCC 4.9

[Jaak Ristioja]

Hello!

In file included from /home/user/prefix/include/gmp.h:51:0,
                 from /home/user/prefix/include/gmpxx.h:33,
                 from /home/user/test.cpp:1:
/home/user/prefix/include/c++/4.9.0/cstddef:51:11: error:
'::max_align_t' has not been declared
   using ::max_align_t;

Even http://gcc.gnu.org/gcc-4.9/porting_to.html bashes GMP for this.
Probably related to __need_size_t?

Best regards,
Jaak Ristioja