How do I delete qmasterd in Incompatible Software folder? 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

Ideas please?
Right, a solution that worked for me...

Restart in Recovery mode, launch Terminal from the Tools menu, move to the directory with the offending file, rm filename and "Bob's your Uncle!"  :-)