Check out the go code:

$go get github.com/OperatorFoundation/Shapeshifter-obfs4-OpenVPN-Transport-Plugin-Cgo

From the go project directory run the following command to generate the library files that you will need:

$go build -buildmode=c-shared -o Shapeshifter-obfs4-OpenVPN-Transport-Plugin.so

Copy the following files into the Xcode/C project directory: Shapeshifter-obfs4-OpenVPN-Transport-Plugin.h and Shapeshifter-obfs4-OpenVPN-Transport-Plugin.so

In Xcode go to Edit Scheme -> Options. For "Working Directory" choose to "Use Custom Working Directory" and then select the main Xcode/C project directory. This will make sure that the Xcode project knows how to find our GO library.

Build the current scheme.