GCCG with C++11

["Hotmail \(ArbolOne\)" <ArbolOne@xxxxxxxxxx>]

If I am not mistaken _MSC_VER >= 1600 is the version that started 
implementing C++11. So, I test for that version of the compiler in my code, 
i.e.
#ifdef _MSC_VER >= 1600
   ....
#endif
I would like to do the same for __GNUG__, but what version of g++ started 
implementing C++11?

Thanks