Difficult to say. The oldest file I could find says it's from 1989, but it got onto my machine a lot later. There's also a lot of "Ship of Theseus" going on, si

Difficult to say. The oldest file I could find says it's from 1989, but it got onto my machine a lot later. There's also a lot of "Ship of Theseus" going on, since it's a source code file that has seen lots of revisions over the decades.