[aur-general] Is base an implicit dependency?

Hi, I would like to have a confirmation. I encountered a PKGBUILD on AUR that is not building correctly except when systemd is present when building. The maintainer considers the makedeps is implicit as systemd is dragged by base metapackage. However devtools only ensures base-devel is present, not base, when building in a clean chroot. And I could not find a mention in the wiki of base expected to be present when writing a PKGBUILD. Could you confirm to me what are the guidelines? Does systemd (make)dependency should be explicit or not? Regards, -- Cédric Girard