
try the following:

  # touch /tmp/test_0
  # export SAGA_LOCATION=/path/to/your/saga/installation/ 
  # make 
  # ./file_copy       /tmp/test_0 /tmp/test_1
  # ./file_copy_async /tmp/test_0 /tmp/test_2
  
You should end up with 

  # ls /tmp/test_*
    /tmp/test_0
    /tmp/test_1
    /tmp/test_2

