In his typical fashion of replacing perfectly working software with useless broken-by-design crap, our dearest Lennart has decided that the time has come for systemd to gain an email program. He determined that the GNU libc was insufficient for the task of a dbus-enabled cpu hogging email client, leading to the new systemd libc: " Technically, this move makes perfectly sense, too. We are sick of supporting unstable glibc APIs and ABIs, and we believe that we greatly benefit from the fact that we now finally have everything the OS userspace consists of in one single repository. Of course, this new libc is not available to Ubuntu and other Linux distributions that have not yet adopted systemd. However, after deliberately choosing a home-grown display server (Wayland) over the generally accepted one (Mir) we decided creating an incompatible libc would be the best approach to create a strong platform following a strict release cadence."
On the bright side "We also renamed the API call creat() to create()..."