friends with phobos, workaround?

[Daniel N via Digitalmars-d-learn]

For the record, I think D made the right decision... omitting 
friends.

However there's one case in particular which I find useful, 
anyone see a good workaround for this?

#include <memory>

class Friendly
{
private:
  int val;
  Friendly(int&& val) : val(val) {}
  friend std::unique_ptr<Friendly> 
std::make_unique<Friendly>(int&& val);
};

int main()
{
  auto yay = std::make_unique<Friendly>(1);
  auto nay = new Friendly(1);
}