When running the s_evergreen script on a source tree I encountered two different failures:

ERROR [evg_cfg.py]: need to run this script inside a wiredtiger repo

and

python3 ./evg_cfg.py check
find: warning: you have specified the -maxdepth option after a non-option argument -name, but options are not positional (-maxdepth affects tests specified before it as well as those specified after it).  Please specify options before other arguments.

The first is due to a check on the output of git config remote.origin.url not being robust enough (I don't know how I cloned something with a different URL, but I didn't do anything super weird to do it). The latter, I expect I have a different version of find which is more snarky.