GNOME Online Accounts is a single sign-on framework for GNOME. It aims to provide a way for users to setup online accounts to be used by the core system and core applications only. Calendar entries show up in GNOME Shell, e-mail in Evolution, online storages are exposed as GVolumes, and so on. Below variables are avaiable for configuration: GTKDOC=yes : Build gtkdoc files INTROSPECTION=no : Disable introspection for this build VALA=no : Don't build Vala bindings