This is a ratcheting forward secrecy protocol that works
in synchronous and asynchronous messaging environments.
The code upstream has been marked as "archived" since February 2022.

The default is to provide a shared library. However, one can build it
statically by passing STATIC=yes:

# STATIC=yes sh libsignal-protocol-c.SlackBuild

This way you can statically link it into your final program and 
remove the library.