std::stod is not a member of std

I can't compile the following code

auto test = 42.02;
double right = std::stod(stck.top());

I'm using Code::Blocks and activated the build option to follow c++11 standard. The compiler does not complain about the auto declaration and compiles, when I put the line below in comments.

I included the string header. I'm not using a namespace.

I have no idea why this does not compile. Please help me!

My compiler is Standard MinGW GCC 4.9