Removing "-std=c++11" results in this

$ make
g++ -Wall -g -I. -DUNICODE -D_UNICODE -DMINGW -DWIN32   -c -o main.o main.cpp
main.cpp: In member function 'virtual void GameWindow::draw()':
main.cpp:176:27: warning: range-based 'for' loops only available with -std=c++11 or -std=gnu++11
         for (Star& star : stars)
                           ^
main.cpp:179:32: error: 'to_wstring' is not a member of 'std'
         font.draw(L"Score: " + std::to_wstring(player.getScore()), 10, 10, zUI, 1, 1, Gosu::Color::YELLOW);
                                ^
In file included from ./Gosu/Bitmap.hpp:9:0,
                 from ./Gosu/Gosu.hpp:14,
                 from main.cpp:2:
./Gosu/GraphicsBase.hpp: At global scope:
./Gosu/GraphicsBase.hpp:100:34: warning: 'Gosu::zImmediate' defined but not used [-Wunused-variable]
     GOSU_DEPRECATED const double zImmediate = -std::numeric_limits<double>::infinity();
                                  ^
<builtin>: recipe for target 'main.o' failed
make: *** [main.o] Error 1