multiple definitions of 'vsnprintf'

I am getting the error:
 libmingwex.a(vsnprintf.o):(.text+0x0): multiple definition of 'vsnprintf';
main.cpp:(.text$vsnprintf[_nsvprintf]+0x0): first defined here
collect2.exe: error: ld returned 1 exit status

the contents of main.cpp are
#include <string>
#include <iostream>
int main(void)
{
    std::cout << "Hello World. "<<std::to_string(1)<<std::endl;
    return 0;
}

the command I am executing in msys.bat is
g++ -std=c++11 main.cpp

I only get this error when mingw32-gcc-g++ version is 8.2.0-4
This error is not in mingw32-gcc-g++ version 6.3.0-1

I saw this question in the archives, but that was 2017, and I downloaded
version 6.3.0-1 last fall.

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