In my tree, I get a lot of .gdb_history files which cvs-create-patch --include-unknowns picks up. Since we don't have any hidden files in our tree and since it's unlikely that we'll ever have, --include-unknowns should simply ignore dotfiles.
It's challenging to ignore hidden files without using the special perl module that knows how to do it, which is not installed by default. I don't know if we're going to be able to do this in a complete way. But we might be able to do something good enough to handle .gdbhistory.
Oh, duh -- "just ignore dotfiles". Easy to do, and good suggestion. Sorry, I misread this.