[aur-general] New users and groups

Hi, I've to introduce some new users in my ossec packages. My question is: may I use specific uid's and gids in PKGBUILD or I've to use adduser and groupadd etc. in install? The problem is that if I use adduser, groupadd and chown in install script pacman complains everytime when I run update of this package. And it's of course very messy way of doing it so. On the other hand, there can be conflicts with existing users and groups. What should I do? Regards Lukas 'stativ' Jirkovsky