This repository contains the X-Plane SDK as downloaded from here, along with some scripts that I use for creating plugins.

Add this repository as a submodule of your repo: git submodule add https://github.com/leecbaker/xplane_sdk

Initialize the submodules: git submodule init && git submodule update --recursive

Add this submodule to your CMakeLists.txt:

add_subdirectory(xplane_sdk)
add_xplane_plugin(your_plugin_name your_plugin_file1.cpp your_plugin_file2.cpp)

Start your build, and that should be it! There's an example plugin in example/ that you can reference to see how it works.