What about it doesn't support Windows? Not disagreeing since I haven't used it much and I'm on Linux, but they have "Quick Start" instructions for Windows.

https://buckbuild.com/setup/getting_started.html

I don't believe c++ support exists yet for Windows (although it works if you are targeting Android).

How do you in 2017 come up with a build system that doesn't even run on Windows.

They made buck for themselves where their infrastructure runs on (*nix). Google's internal build tool (before bazel) was the same. Now chromium's GN build tool was made for their product that was targetted to run everywhere, which is why windows support is good.

how is current_year different than last_year?