Fixed point

I have included the following three files in my project folder: fixed_float_types_c.vhdl, fixed_pkg_c.vhdl, and float_pkg_c.vhdl.

Then as my top level VHDL file I have the following headings:

LIBRARY IEEE;

USE IEEE.STD_LOGIC_1164.ALL;

USE IEEE.NUMERIC_STD.ALL;

LIBRARY WORK;

USE WORK.fixed_pkg.ALL;

ENTITY help IS

...

I get an error in quartus saying:

design library "work" does not contain primary unit "fixed_pkg"

Any help is greatly appreciated.