anchor.diff:  
     mesonFlags = [
       "-Dudev_dir=${placeholder "out"}/lib/udev"
  +    "-Dgnome_session_ctl_path=${gnome-session-ctl}/libexec/gnome-session-ctl"
     ];
   
     # Default for release buildtype but passed manually because
  
positive.code:   });
  
    patches = [
      (substituteAll {
        src = ./fix-paths.patch;
        inherit tzdata;
  
negative.code: , tzdata
  , nss
  , gcr
  , gnome-session-ctl
  }:
  
  stdenv.mkDerivation rec {
  