In a somewhat similar vien, a while back I was putting some code I wrote in University (1995-2001) on GitHub. One of the C projects just needed 1 linker flag changed. The Prolog didn't need any changes. I was pleasantly surprised.

I was also trying to put a OS X App from 2009 on GitHub, but gave up before I could get it to compile with the latest X Code. Wasn't worth the effort.