how to compile vhdl package in quartus ii

when I comile my project,it says can't find IEEE.VITAL_memory.

I find it really no IEEE.VITAL_memory package in my current quartus ii 6.0 edition.

so I down memory_p.vhd and memory_b.vhd which including the VITAL_memory and add them to the ieee library directroy.

but when i complie again ,it also says can't find IEEE.VITAL_memory.

in fact ,in $QUARTUS_ROOT/libraries/vhdl/ieee directory,there are memory_p.vhd and memory_b.vhd just like other files like prmtvs_b.vhd, prmtvs_p.vhd,timing_b.vhdl,timing_p.vhdl etc.

maybe need to recompile ieee ? I tried and i didn't make it ,perhaps I don't know how to do.

I want to ask : how can I compile the VITAL_memory package into the IEEE libaray or recomplie ieee ,and then I can use it like this

library IEEE;

use IEEE.VITAL_memory.ALL;

tks u very much!