Updated on June 2020
Back in 2003, Sybase introduced CodeXchange, an online forum that allowed developers to share code samples and collaborate on open source projects. Unfortunately, in 2009 Sybase decided to shut down that system. [...]. This Article by Bruce Armstrong explains how to use GIT from Legacy versions of PowerBuilder (PB 12.6 and older).
Since version 2017 R2, PowerBuilder provides a native interface for both SVN & GIT
You can read more about connecting to a GIT or SVN repository on the Appeon website