libinput-dev.tcz
   libinput.tcz
      mtdev.tcz
      libevdev.tcz
      udev-lib.tcz
         glib2.tcz
            libffi.tcz
   mtdev-dev.tcz
      mtdev.tcz
   libevdev-dev.tcz
      libevdev.tcz
   udev-dev.tcz
      udev-lib.tcz
         glib2.tcz
            libffi.tcz