4.4 BSD Lite
Then all of the derived projects had to ensure that they didn't have those files, or anything derived from them.
I think at the time this would have impacted:
Just like Net/2, this was not a complete OS onto itself, however it was the vast majority needed.
@(#)init_main.c 8.9 (Berkeley) 1/21/94
4.4 BSD Lite can still be found on the internet...
The next and final release was 4.4 BSD Lite2