This client is useful when you have the domain managed by DigitalOcean and want to set the IP address it should point to. Personally I use it in my Asus RT-AC68U (ARM based) router as a custom dymanic DNS client.
There is a Makefile to build the application for ARM (Linux) and your current platform.
Simply run make.
You have to obtain Digital Ocean OAuth token first.
See https://developers.digitalocean.com/documentation/v2 for more info.
Simply run do-ddns -ip {YOUR IP ADDRESS} -host {YOUR DOMAIN NAME} -token {YOUR DIGITAL OCEAN TOKEN}