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GNOME Calls relies on dconf. Evidence supporting this claim: https://packages.debian.org/sid/gnome-calls depends on dconf-gsettings-backend. Discussed in https://github.com/NixOS/nixpkgs/pull/136537#issuecomment-1009903194 :
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at https://nixos.org/nixos and in the manual in doc/manual.