Heh, I don't think that's enough information for anyone here to
understand what's going on :)
You just need to look at what slack is doing, and I'm sure it will
become obvious -- it will tell you, in increasing detail, if you pass
one or more "-v" options. The file installation should happen in the
"install" step that runs "slack-installfiles." Once you see the
underlying rsync commands that are being run, it should be more clear.
Make sure you haven't defined ROOT to point somewhere else than "/".
Hope that helps! :)