This repository vendors boost using submodules. Be sure to pull them when cloning or updating this repository.
Fresh clone:
git clone --recurse-submodules git@github.com:secondlife/3p-boost.git
Existing checkout:
git submodule update --init --recursive
Since boost has a lot of submodules you may want to enable parallel submodule jobs:
git config --global submodule.fetchJobs $(nproc)