I see that it's a bunch of packages, under the heading of "Facebook Go". I assume this is something related to Google's Golang?
I click on "tool" ("Go library that wraps the go tool"). This has a README that points to a documentation link. And that documentation says things like, "Build the Command and return the path to the binary."
So, I guess we're talking about some kind of compiler here? A Golang compiler? How to I get it, how do I use it, and what -- if anything -- does this whole mess have to do with Facebook?