When running the minimal system on a Turtlebot with Ubuntu 12.04/Fuerte I'm getting the following error:

/opt/ros/fuerte/stacks/turtlebot/turtlebot_node/nodes/turtlebot_node.py:54: UserWarning: roslib.rosenv is deprecated, please use rospkg or rosgraph.rosenv
  import roslib.rosenv
Traceback (most recent call last):
  File "/opt/ros/fuerte/stacks/turtlebot/turtlebot_node/nodes/turtlebot_node.py", line 68, in <module>
    import turtlebot_node.robot_types as robot_types
  File "/opt/ros/fuerte/stacks/turtlebot/turtlebot_node/src/turtlebot_node/robot_types.py", line 29, in <module>
    import create_sensor_handler
  File "/opt/ros/fuerte/stacks/turtlebot/turtlebot_node/src/turtlebot_node/create_sensor_handler.py", line 42, in <module>
    _struct_I = roslib.message.struct_I
AttributeError: 'module' object has no attribute 'struct_I'

Which seems to have something to do with rosenv. Does anyone have any ideas on how to go about fixing this?