Search notes:

Arch Linux User Repository

https://aur.archlinux.org/.
AUR packages rely on the base-devel group being installed.

Yaourt

Yaourt is outdated(!) and was used as interface to the the AUR (Yaourt = Yet AnOther User Repository Tool).
Yaourt is installed with pacman:
pacman -Sy yaourt
Sync yaourt with the AUR:
yaourt -Syy

See also

AUR helpers
pacman
/etc/makepkg.conf is used to set build-optimazation settings for building AUR packages.

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