Hello, haven't seen this in OpenBSD related press nor mailing list, so I've thought it may be good to let you know that Illumos which is former-OpenSolaris fork has adopted arc4random from OpenBSD in a commit done on April 7 by Robert Mustacchi.
Kudos to OpenBSD team and especially to people who worked on that. Thanks! Karel PS: I'm not affiliated in any way with Illumos nor with Robert and his employer. I've just being browsing Illumos-gate commit history and seen this https://github.com/illumos/illumos-gate/commit/9d12795f87b63c2e39e87bff369182edd34677d3