How easy to create a Hello World program with Nana?

Nana-int-01.cpp

#include <nana/gui/wvl.hpp>
#include <nana/gui/widgets/label.hpp>

int main()
{
    using namespace nana::gui;
    form fm;
    label lb(fm, fm.size());
    lb.caption(L"Hello, World");
    fm.show();
    exec();
}