boost cannot be used even if it is specified in --options

[liushapku]

The following code can never run successfully from vim

#include <boost/tuple/tuple.hpp>
#include <iostream>
int main()
{
    int x = 3;
    std::cout << x << std::endl;
}

I ran it using :Wandbox --options=boost-1.67. Changing the boost version in options or changing the compiler has no effect.

The error message is:

mprog.cc:1:10: fatal error: 'boost/tuple/tuple.hpp' file not found

Commenting out the first line (#include <boost/tuple/tuple.hpp>) can make it work

Could you please take a look? Thanks