So, I recommend doing a git pull on the Xyce repo, rebuilding and cycling the tests again. Many of them should go away. The only ones I don’t have a quick explanation for are the “Output” tests. BUT those rely on Python and Perl. Possibly you don’t have those installed? Or possibly are missing a python package or two? I know that the Output/AC/ac-raw-ascii runs a python program called spice_read.py, and it depends on numpy, string and sys.