no member named 'unique_ptr' in namespace 'std'

[Maruko]

I am trying to use std::unique_ptr in the main.cpp
but I get this error error: no member named 'unique_ptr' in namespace 'std'
In the .pro file I have CONFIG += c++14
Library : Qt5.11
Compiler: gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.10)

What am I missing?
TIA

[Maruko]

SOLVED

Add his include which is needed for std::unique_ptr

#include <memory>  

Or, in case is possible to replace

std::unique_ptr<T>

it with the same Qt-style operator

QScopedPointer<T>