On Thu, 2024-06-13 at 19:03 +0200, Ralf Mardorf wrote: > sudo apt-get build-dep claws-mail Maybe you need to add claws-mail-acpi-notifier claws-mail-address-keeper etc., too. Getting the build dependencies this way might be imperfect, but you get informed about it, when you start building claws. Btw. you can also build the GTK3 branch.