C++ + libavformat + libavcodec on Mac environment

Hello, I'm learning C++ and trying to implement a simple video application. Since I'm new to libav libraries, I have a hard time compiling my code. I get a linkage error, so build works fine on my sample test, but somewhere in linking to some external libraries, I get an error. I'd like someone to look over my setup, check my CMakeLists files, my environment variables, and help me debug why the files are not getting linked. This is just my starting point, if communication is successful between us, there's an ongoing and a much bigger part of the development that I need help with, also in C/C++.