MarsSeed [1] filed a deletion request for libsynaptics [2]: Broken, discontinued, unused legacy Synaptics driver from 2007. Cannot be built due to missing dependency.
Safe to delete: nothing depends on it. Nowadays, libinput handles even Synaptics touchpads well, but extra repo also carries the xf86-input-synaptics driver for legacy devices. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/libsynaptics/
