I'm not familiar with this library. I did a quick research and found that the Libiio library is described here: What is libiio? [Analog Devices Wiki]. The source code is here: analogdevicesinc/libiio · GitHub. You should try to build it for Edison and install it from the source code. Maybe you can post a request in this thread Edison opkg package repo created to include this library in the Edison repo and install it from there.