On Fri, 20 May 2016 19:15:06 +0200 Albin wrote: > > ls -lL $(which xflock4) > The output from that is: > > -r-xr-xr-x 10 root root 1536 1 jan 1970 > /run/current-system/profile/bin/xflock4 > > > Albin Aha! Add (screen-locker-service xfce4-session "xflock4") to your services in your guix config file. This means: (operating-system ...... (services (cons* (screen-locker-service xfce4-session "xflock4") %desktop-services))) Or add it to an existing "services" entry.