I have this pesky file "qmasterd" that has been moved to the "Incompatible Software" folder by the macOS Installer. It must have been lying around on my Mac from years ago when I had Final Cut Pro v6 installed. Anyway, I cannot delete it, and I've tried a lot...
The file has these permissions:
-r-sr-sr-x 1 root daemon 280688 27 Apr 2007 qmasterd
When I try to chmod, chgrp, or chown all I get is:
bash-3.2# chmod g-s qmasterd chmod: Unable to change file mode on qmasterd: Operation not permitted