FusionAuth Client Builder 
Credits
Thanks to the following folks for your most excellent contributions!
Build a client library
Setup Savant
Linux or macOS
mkdir ~/savant
cd ~/savant
wget http://savant.inversoft.org/org/savantbuild/savant-core/1.0.0/savant-1.0.0.tar.gz
tar xvfz savant-1.0.0.tar.gz
ln -s ./savant-1.0.0 current
export PATH=$PATH:~/savant/current/bin/
You may optionally want to add ~/savant/current/bin to your PATH that is set in your profile so that this change persists. You'll also need to ensure that you have Java >= 8 installed and the environment variable JAVA_HOME is set.
Building
Listing each client library build targets
sb --listTargets
Building a single library
To build a single client library, you'll want to have the corresponding repo checked out in the same parent directory.
For example, your directory structure should look something like the following:
fusionauth
├── fusionauth-client-builder
├── fusionauth-android-client
├── fusionauth-csharp-client
├── fusionauth-go-client
├── fusionauth-java-client
├── fusionauth-javascript-client
├── fusionauth-node-client
├── fusionauth-php-client
├── fusionauth-python-client
├── fusionauth-ruby-client
├── fusionauth-swift-client
└── fusionauth-typescript-client
The client builder will assume the project is in the same parent directory.
sb build-java
Building all clients
sb build-all
For more information on the Savant build tool, checkout savantbuild.org.