PrimeTime and IC Compiler setup file

I setup .synopsys_pt.setup and i am trying to use it fifo i synthesis my fifo using 90nm library i am using same library for prime time it link the library but give me following information
Information: 204 (91.07%) library cells are unused in library saed90nm_max.....
Information: 224 (100.00%) library cells are unused in library saed90nm_min.....
Information: 224 (100.00%) library cells are unused in library saed90nm_typ.....
Information: 43 (100.00%) library cells are unused in library saed90nm_io_max.....
Information: 43 (100.00%) library cells are unused in library saed90nm_io_min.....
Information: 43 (100.00%) library cells are unused in library saed90nm_io_typ.....
Information: 12 (100.00%) library cells are unused in library saed90nm_min_cg.....
Information: 12 (100.00%) library cells are unused in library saed90nm_max_cg.....
Information: 12 (100.00%) library cells are unused in library saed90nm_typ_cg.....

can anyone explain me because after that it cannot perform check_timing

did u setup search_path or link_path variable? you need the second one

Please make sure linking is happening proper.