Due to my setup I cannot make use of pacman to actually install packages, however if I install a package from the Arch repositories manually by downloading and extracting it, eg:
wget http://mirrors.kernel.org/archlinux/core/os/x86_64/curl-7.26.0-1-x86_64.pkg.tar.xz
tar -Jxvf curl-7.26.0-1-x86_64.pkg.tar.xz -C /
...is there a way to make pacman aware of it so that it can control future updates or un-installation?