pacman -S base-devel

wget http://aur.archlinux.org/packages/package-query/package-query.tar.gz
tar zxvf package-query.tar.gz
cd package-query
makepkg -si
cd ..
wget http://aur.archlinux.org/packages/yaourt/yaourt.tar.gz
tar zxvf yaourt.tar.gz
cd yaourt
makepkg -si
cd ..