4.3.0 has been pushed to Arch testing repo. Here is the current list of patches used https://github.com/anatol/osquery/tree/4.3.0-archlinux cc @alessandrogario @theopolis

Very cool -- hopefully most of those changes can be folded into the upstream build logic.

What is the current state of the build system refactoring (such as ability to use system libraries)?

Unsure, @alessandrogario or @Stefano Bonicatti might know

@Stefano Bonicatti is still working on it!