You can install yaourt from the AUR:

git clone https://aur.archlinux.org/package-query.git
cd package-query
makepkg -si
cd ..
git clone https://aur.archlinux.org/yaourt.git
cd yaourt
makepkg -si
cd ..

Examples

Search and install:

yaourt Sync database, upgrade packages, search aur and devel (all packages based on dev

version) upgrades:

yaourt -Syu --devel --aur Build package from source:
yaourt -Sb Check, edit, merge or remove *.pac* files:
yaourt -C Get a PKGBUILD (support splitted package):
yaourt -G Build and export package, its sources to a directory:
yaourt -Sb --export Backup database:
yaourt -B Query backup file:
yaourt -Q --backupfile

Notes

Yaourt gives an opportunity to edit the PKGBUILD and if the answer is 'y' it asks which editor to use if none is selected by your environment. Type in 'nano'. When getting tclx for use with emacspeak you will need to add armv7 if it is for a Pi2.