What do you need base-meta and base-devel-meta for?
pacman -S base and pacman -S base-devel install every package of these groups. And with this method you always automatically get the latest group packages.
pacman -Rs base and pacman -Rs base-devel deinstall these groups.
Btw., base is automatically installed during the first installation from the install CD anyway. And not having base installed can have curious effects.
I'd rather suggest deleting these packages from AUR.
Heiko
I adopted those packages from orphan status. It's for people who like to manage their dependencies carefully. Thus one need only base-devel-meta as explicit and the rest of the toolchain (gcc, patch, etc.) can be made into dependencies without showing up in pacman -Qtd. I don't actually use those packages. -- Kiwis and Limes: http://kaitocracy.blogspot.com/