Using pacman to install packages into a seperate root

Question

After working with an Arch Linux machine for 1-2 years I switched jobs and was given a Mac, which I've enjoyed so far.
I would, however, like to switch back to Arch Linux but there's something that I've been able to do on Mac OS X using its unofficial package manager Homebrew (http://mxcl.github.com/homebrew/) which I was wondering if it were possible with pacman.
Typically you have one installation of Homebrew, at /usr/local, and by running 'brew' (/usr/local/brew) it knows that its root is at /usr/local & looks there for all dependencies & installs packages there. If, however, you install homebrew elsewhere (could be the first or a second installation), for instance ~/sw, then running brew from there will install packages in that root.
I've found this very useful to install package specific to a project I'm working on (specific vendor & version of DB, specific web server etc) without having to install them globally on my system and at the same time without having to resort to installing everything by hand (including dipendencies).
Is this possible with Pacman?
Thanks in advance,
Dale

Answer 1

this wiki isn't entirely related, but can be helpful.
https://wiki.archlinux.org/index.php/Ar … bit_System
4. Sync pacman:
pacman --root /opt/arch32 --cachedir /opt/arch32/var/cache/pacman/pkg --config /opt/arch32/pacman.conf -Sy
5. Install the base and optionally base-devel groups:
pacman --root /opt/arch32 --cachedir /opt/arch32/var/cache/pacman/pkg --config /opt/arch32/pacman.conf -S base base-devel