Libraries included with Theos for easy compilation of most projects out of the box.
This repo uses .tbd files, a plain text format that contains the minimum data needed for linking. These are supported as of clang 700 (Xcode 7) and are used in iOS 9.0 and newer SDKs. There is not much information available on them, but @mstg has made a .tbd generator called machotbd. Xcode also includes its own tbd generator which can be invoked via xcrun tapi.