[Kristine1975]

>Because they've been unsuccessful in completing the reboot, releasing the sources is a way of apologizing.

They wanted to publish the original source code from the get go. Here's an article from mid 2016 talking about it: https://www.gamezone.com/news/system-shock-s-original-source...

>Since the instructions mention a PPC requirement to build on Mac, I'm assuming these are fairly old.

The game was released in 1994, so yeah, they are old :-)