Our goal in this document is to explain how to build virtually all
the dependencies for Houdini from source (in part to vet licenses and
easy AGPL compliance, but also to operate more securely). Initially,
it won't be possible to do that so begin documenting places where
items are not built from source.
These instructions are more detailed than what will ultimately appear
in `docker.md`, and focus on building from sources wherever possible.
They are specifically designed to include extra detail for users not
as familiar with docker, or for those who would like bootstrap
further from scratch to create a Houdini docker image.
