None of the above solutions worked for me. Is there any other way to be able to remove the file with "Operation not permitted" error?
$ ls -lOe X11
lrwxr-xr-x 1 omeran staff restricted 8B Mar 24 2017 X11 -> /opt/X11
$ sudo chflags -hv noschg X11
$
$ sudo rm -rf X11
rm: X11: Operation not permitted
omeran
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