It's necessary to do this in order to fix ckb's compilation, now that
fixupPhase rejects derivation results containing references to the temporary
build directory. It seems like good practice so I've added it to the
other packages that I maintain.
ckb is a driver for Corsair keyboards/mice. It also contains a graphical tool for configuring their LED backlight settings.
The driver is implemented as a userland daemon. A NixOS module is included that runs this as a systemd service.
