thanks. now i'm able to build and run teleop_base. but i have run into
another problem. in this tutorial 
http://www.ros.org/wiki/simulator_stage/Tutorials/SimulatingOneRobot
SimulatingOneRobot 
when i run "rosrun teleop_base teleop_base_keyboard
base_controller/command:=cmd_vel"
there is a delay of 2-3 seconds between pressing the key and the movement in
the stage.

the delay gets worse(5-10 seconds) when i start rviz "rosrun rviz rviz -d
`rospack find stage`/rviz/stage.vcg"

my computer is pretty fast(amd quad core, 4gb ram, hd4870 )
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