PromiseKit SystemConfiguration Extensions 
This project adds promises to Apple’s SystemConfiguration framework.
CocoaPods
pod "PromiseKit/SystemConfiguration" ~> 6.0
The extensions are built into PromiseKit.framework thus nothing else is needed.
Carthage
github "PromiseKit/SystemConfiguration" ~> 3.0
The extensions are built into their own framework:
// swift
import PromiseKit
import PMKSystemConfiguration
// objc
@import PromiseKit;
@import PMKSystemConfiguration;