"Use of undeclared identifier 'Darwin'" when using "in_addr" type

Development C++ interoperability
1

When using "in_addr" in Swift, enabling C++ interoperability, and importing the generated Swift.h header into a C++ file, this error gets produced from the Swift.h file.

Swift:

import Darwin

public enum MyEnum {
    case value(in_addr)
}

C++

#include <netinet/in.h>
#include "MyProject-Swift.h"

The generated code is using Darwin as a namespace but I'm unable to to resolve this error. This is from Xcode 16.1. Any suggestions?