If you're on a typical UNIX/Linux box, the loaction of these lib modules is controlled by LD_LIBRARY_PATH. Search your relavant perl dirs for .so file Unix or .dll Windows, and make sure these dirs are included. Typically it's export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:...FULL PATHS. ESPCIALLY NOTE, that these are probably not in INC, just the executables will be there.