Actually today it got a lot easier
First configure your self to be able to install stuff from AlexT_Intel repos.
Then to do the above, you should be able to do:
opkg install git
opkg install cmake
And then most of the steps I mentioned earlier starting with:
git ...
I did this earlier today on my Intel Breakout board version as to try it out. Note: the higher speed GPIO stuff was integrated into today, so should be out very soon now with something you can simply install.
As for not knowing a lot about Linux, I fully understand. I was a complete novice about this, not that long ago. Still feel that way some times. For what it is worth, I keep my cheat sheet of notes about setting stuff up, and how to do things, in my readme.md file that is associated with my Raspberry_Pi project up on github. I should rename the project, but it was the first linux card I started with... Since then played with a few (BeagleBone Black, Odroid U2/U3, Now these...)