Geoclue is a D-Bus service that provides location information. The primary goal of the Geoclue project is to make creating location-aware applications as simple as possible, while the secondary goal is to ensure that no application can access location information without explicit permission from user. geoclue2 is a rewrite of the original geoclue. You can safely install both geoclue and geoclue2 at the same time. avahi is an optional dependency, used for location sharing (by redshift, for example). To enable it, use the option AVAHI=yes AVAHI=yes ./geoclue2.Slackbuild