Bring xdg-utils up to date as of 2009-07-27.

third_party/xdg-utils/scripts/xdg-su

 #!/bin/sh
 #---------------------------------------------
 #   xdg-su
 #
 #   Utility script to run a command as an alternate user, generally
 #       the root user, with a graphical prompt for the root
 #       password if needed
 #
 #   Refer to the usage() function below for usage.
 #
@@ skipping 342 matching lines @@
     else
         su_generic
     fi
 }
 
 su_generic()
 {
     if [ -z "$user" ] ; then
         xterm -geom 60x5 -T "xdg-su: $cmd" -e su -c "$cmd"
     else
-        xterm -geom 60x5 -T "xdg-su: $cmd" -e su -u "$user" -c "$cmd"
+        xterm -geom 60x5 -T "xdg-su: $cmd" -e su -c "$cmd" "$user"
     fi
 
     if [ $? -eq 0 ]; then
         exit_success
     else
         exit_failure_operation_failed
     fi
 }
 
 [ x"$1" != x"" ] || exit_failure_syntax
@@ skipping 55 matching lines @@
 
     generic)
     su_generic
     ;;
 
     *)
     [ x"$user" = x"" ] && user=root 
     exit_failure_operation_impossible "no graphical method available for invoking '$cmd' as '$user'"
     ;;
 esac