Dependency problem as tf package does not exist

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  I have now moved to ROS fuerte, since I need to integrate ROS with USARSim.I have created workspace as given in the ros website. I have created sandbox directory also; but don't know its usage.  
  My package dependency is given below:

std_msgs,roscpp,tf,geometry_msgs,nav_msgs, actionlib,sensor_msg,control_msgs When I type in the terminal root@ubuntu:~/fuerte_workspace/sandbox# rospack find usarsim_inf

/root/fuerte_workspace/sandbox/usarsim_inf

root@ubuntu:~/fuerte_workspace/sandbox# rospack depends1 usarsim_inf

[rospack] Error: package/stack usarsim_inf depends on non-existent package tf Thus rosmake will also give me error. I have install tf package manually. *So, what modification is needed; so that "rosmake usarsim_inf" works properly? *