Make a developer account and download the SDK from Brother.
Unzip the SDK and create a symbolic link to the libs within this project's libs directory with:
$ mkdir libs
$ ln -s path/to/sdk/bpsdki3112/Sample/Swift_Sample/libs/BRPtouchPrinterKitW.framework libs/BRPtouchPrinterKitW.framework
Open the GiftCards.xcodeproj in XCode.
Hit CMD+B to build!