Build with CMake, using the following options: ``` cmake .. -DCMAKE_OSX_ARCHITECTURES="x86_64;arm64" -DCMAKE_OSX_DEPLOYMENT_TARGET="10.12" -DBUILD_SHARED_LIBS=ON ``` And some minor tweaks with `install_name_tool -id` to make sure that the resulting libopus.0.dylib referred to itself with @rpath and not full paths of the build directory. Version v1.3.1-101-g66d060c7 was used from the following repository: https://github.com/xiph/opus.git