pacman via pacstrap

hi, I use `pacstrap -U` to install locally forged packages in a dedicated folder. this dedicated folder already contains some files and some of these files are causing problems for `pacstrap -U` (eg. `pacman -U`). i'd like to be able to use `--overwrite` option and pass it from `pacstrap`. is it possible to pass options to `pacman` via `pacstrap` ? regards, lacsaP.