UWSim install error - not installing osgocean

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I'm trying to install UWSim

http://www.irs.uji.es/uwsim/wiki/index.php?title=Installing_UWSim

It installs the first 16 packages, but encounters an error when installing osgocean. The message is

    [rosmake-2] Starting >>> urdf [ make ]                                                                                                                                  
[rosmake-2] Finished <<< urdf ROS_NOBUILD in package urdf                                                                                                               
[ rosmake ] All 12 lines
{-------------------------------------------------------------------------------
  make wipe
  make[1]: Entering directory `/opt/ros/fuerte/stacks/underwater_simulation/osgOcean'
  rm -rf lib
  rm -rf include
  rm -rf share
  rm -rf build
  rm -rf installed
  touch wiped
  touch: cannot touch `wiped': Permission denied
  make[1]: *** [wipe] Error 1
  make[1]: Leaving directory `/opt/ros/fuerte/stacks/underwater_simulation/osgOcean'
-------------------------------------------------------------------------------}
[ rosmake ] Output from build of package osgOcean written to:
[ rosmake ]    /home/umesh/.ros/rosmake/rosmake_output-20120621-163553/osgOcean/build_output.log          
[rosmake-0] Finished <<< osgOcean [FAIL] [ 0.04 seconds ]                                                                                                               
[ rosmake ] Halting due to failure in package osgOcean. 
[ rosmake ] Waiting for other threads to complete.                                                             
[ rosmake ] Results:                                                                                                                                                    
[ rosmake ] Built 17 packages with 1 failures.                                                                                                                          
[ rosmake ] Summary output to directory

All dependancies are installed.