Required system dependencies when building from source

The documentation in "building from source recommends" to run:

sudo ./install-system-packages.sh

Looking at that script and trying to understand what it does, I gave up after following three indirections.

Is the list of required system dependencies documented somewhere?

Edit:

https://github.com/facebook/watchman/blob/a048dc8c7de23991d497136173a6685418f7e409/build/fbcode_builder/manifests/watchman#L13-L23