How do I "normalize" a pathname using boost::filesystem?

We are using boost::filesystem in our application. I have a 'full' path that is constructed by concatenating several paths together:

#include <boost/filesystem/operations.hpp>
#include <iostream>
     
namespace bf = boost::filesystem;

int main()
{
    bf::path root("c:\\some\\deep\\application\\folder");
    bf::path subdir("..\\configuration\\instance");
    bf::path cfgfile("..\\instance\\myfile.cfg");

    bf::path final ( root / subdir / cfgfile);

    cout << final.file_string();
}

The final path is printed as:

c:\some\deep\application\folder\..\configuration\instance\..\instance\myfile.cfg

This is a valid path, but when I display it to the user I'd prefer it to be normalized. (Note: I'm not even sure if "normalized" is the correct word for this). Like this:

c:\some\deep\application\configuration\instance\myfile.cfg

Earlier versions of Boost had a normalize() function - but it seems to have been deprecated and removed (without any explanation).

Is there a reason I should not use the BOOST_FILESYSTEM_NO_DEPRECATED macro? Is there an alternative way to do this with the Boost Filesystem library? Or should I write code to directly manipulating the path as a string?