> at one point in the last 10 years they still used sunos4 as their base configuration because you know,
What exactly do you mean with this? I tried to find some more information, and all I could find were some fixes from 2001[1] (SunOS 4 was supported until 2003), a minor refactor in 2008 with "SunOS 4 is probably broken anyway"[2], and that's pretty much it. SunOS 4 was moved to "Unsupported Platforms" with the release of 7.3, in 2002.[3]