std::cerr confusion

[n3rdx]

Hi, I am learning Nanogui use. I made a local version of Example #1, as example11.cpp with calls to SQLite3 (in development) and can easily compile the code without modifications on Win10 and Linux 64 bit, and run the executable in a graphical environment. What I would like to learn is why does MS Visual Studio 2019 complain as shown below, when I review the code block (in x64-Debug mode, and in Linux-GCC-Debug mode), where it says concerning several invocations of "std::cerr", or stderr - yet the program compiles in both environments with vcpkg + Cmake and runs well. So, is this fully normal, or do we need to have a #ifdef ... #endif block to define a gnu-C++ specific c++ function call?

namespace "std" has no member "cerr"

and this is related to the code snippet:

} catch (const std::exception &e) {
        std::string error_msg = std::string("Caught a fatal error: ") + std::string(e.what());
        #if defined(_WIN32)
            MessageBoxA(nullptr, error_msg.c_str(), NULL, MB_ICONERROR | MB_OK);
        #else
            std::cerr << error_msg << std::endl;
        #endif
        return -1;
    } catch (...) {
        std::cerr << "Caught an unknown error!" << std::endl;
    }

thanks