[AD9361] Header location


I am trying to build a simple program using libiio and libad9361 on macOS Mojave. To include <iio.h> i just simply replaced such line with <iio/iio.h> and it works (just followed an example from libiio). But what about the "ad9361.h" header? How can I include this file? Where it is placed?

Thanks in advice