'From: Larry McVoy <lm@mcvoy.com>
Sent: Fri, 29 Sep 2017 08:59:27

I've worked in lots of other kernel source bases.  They all sucked in
comparison.  Including Solaris, fuck that shit, Bryan will yell at me
but Solaris sucked.  ...'

As far as I remember Sunos-4 Kernel became AT&T Sys5r4 kernel and made it into Sunos5 which became Solaris.