Resolving trackpad not found in KDE Plasma 6 on FreeBSD

If you have a working trackpad in KDE Plasma 6 but the settings panel reports it as Not Found try the following:

# sudo libinput list-devices

You should see something like the following:

Device:           SynPS/2 Synaptics TouchPad
Kernel:           /dev/input/event5
Group:            6
Seat:             seat0, default
Size:             70x50mm
Capabilities:     pointer gesture
Tap-to-click:     disabled
Tap-and-drag:     enabled
Tap drag lock:    disabled
Left-handed:      disabled
Nat.scrolling:    disabled
Middle emulation: disabled
Calibration:      n/a
Scroll methods:   *two-finger edge
Click methods:    *button-areas clickfinger
Disable-w-typing: enabled
Disable-w-trackpointing: enabled
Accel profiles:   flat *adaptive custom
Rotation:         n/a

All you need to do now is create an X11 configuration file in /usr/local/etc/X11/xorg.conf.d. With something like the following:

40-libinput.conf

Section "InputClass"
Identifier "libinput touchpad catchall"
MatchIsTouchpad "on"
MatchDevicePath "/dev/input/event5"
Driver "libinput"
EndSection

Where MatchDevicePath "/dev/input/event5" comes from the first command output.

Once you have done this log out then back in. Hopefully now you should see the trackpad settings.