in addition to the repositories, the arch user repository (aur) provides user-made pkgbuild scripts for packages not included in the repositories. these pkgbuild scripts simplify building from source by explicitly listing and checking for dependencies and configuring the install to match the arch architecture. arch user repository helper programs can further streamline the downloading of pkgbuild scripts and associated building process. however, this comes at the cost of executing pkgbuilds not validated by a trusted person; as a result, arch developers have stated that the utilities for automatic finding, downloading and executing of pkgbuilds will never be included in the official repositories.