Carthage is a decentralized dependency manager that builds your dependencies and provides you with binary frameworks.

You can install Carthage with Homebrew using the following command:

$ brew update
$ brew install carthage

specify it in your Cartfile:
github "Alamofire/Alamofire" ~> 4.7

Run carthage update to build the framework
drag the built Alamofire.framework into your Xcode project.