anchor.diff:      buildCommand = ''
         ensureDir $out
         
  -      ln -s ${dbus}/etc/dbus-1/session.conf $out/session.conf
  -      
         cp ${dbus}/etc/dbus-1/system.conf $out/system.conf
  +
  +      # !!! Hm, these `sed' calls are rather error-prone...
   
         # Tell the daemon where the setuid wrapper around
         # dbus-daemon-launch-helper lives.      
         sed -i $out/system.conf \
             -e 's|<servicehelper>.*/libexec/dbus-daemon-launch-helper|<servicehelper>${config.security.wrapperDir}/dbus-daemon-launch-helper|'
   
  -      # Add the system-services directories to the daemon's search path.
  +      # Add the system-services and system.d directories to the system
  +      # bus search path.
         sed -i $out/system.conf \
             -e 's|<standard_system_servicedirs/>|${systemServiceDirs}|'
  -          
  -      # Note: system.conf includes ./system.d (i.e. it has a relative,
  -      # not absolute path).
  +
  +      cp ${dbus}/etc/dbus-1/session.conf $out/session.conf
  +      
  +      # Add the services and session.d directories to the session bus
  +      # search path.
  +      sed -i $out/session.conf \
  +          -e 's|<standard_session_servicedirs />|${sessionServiceDirs}|'
  +
         ensureDir $out/session.d
         ensureDir $out/system.d
         
         for i in ${toString cfg.packages}; do
           for j in $i/etc/dbus-1/session.d/*; do
  -          ln -s $j  $out/session.d/
  +          ln -s $j $out/session.d/
           done
           for j in $i/etc/dbus-1/system.d/*; do
             ln -s $j $out/system.d/
  
positive.code: 
          daemonType = "fork";
  
          exec = "${dbus}/bin/dbus-daemon --config-file=${configDir}/system.conf";
  
          postStop =
            ''
  
negative.code: 
    systemServiceDirs = concatMapStrings
      (d: "<servicedir>${d}/share/dbus-1/system-services</servicedir> ")
      cfg.packages;
  
    sessionServiceDirs = concatMapStrings
      (d: "<servicedir>${d}/share/dbus-1/services</servicedir> ")
      cfg.packages;
  
  in
  