DCFIFO Megafunction simulation problem

ok, i've included fifo_new.v and here comes the error:

#  3 compiles, 0 failed with no errors. 
vsim work.tb_dc_fifo#  vsim work.tb_dc_fifo #  Loading work.tb_dc_fifo#  Loading work.fifo_new#  ** Error: (vsim-3033) E:/ihtesham/Tasks_And_Projects/FPGA/IPCores/fifo_error/fifo_new.v(74): Instantiation of 'dcfifo' failed. The design unit was not found.#          Region: /tb_dc_fifo/fifo_new_inst#          Searched libraries:#              E:\ihtesham\Tasks_And_Projects\FPGA\IPCores\fifo_error\work#  Loading work.read_control_logic#  Error loading design

The design unit was not found!!

i am using modelsim (A)SE, so all atera libraries should be pre-installed and compiled, but looking at the searched libraries, it doesn't seem to be searching all altera libraries...

#          Searched libraries:#              E:\ihtesham\Tasks_And_Projects\FPGA\IPCores\fifo_error\work

how should i make it search altera_mf library??