ActionScript :: How To Include External Library Into Flash

I have downloaded some external actionscript library in a form of a bunch of folders with .as files that have the following folder structure:
com/helper_lib1/*.as
com/helper_lib2/*.as
com/primary_lib/LibClass.as <- primary lib I want to use

Lib.as has the following code:
package com.primary_lib{
import com.helper_lib1.*;
import com.helper_lib2.*;
public class LibClass extends MovieClip{.....

Now I have some fla project where I want to use this com/primary_lib/lib.as, something like:
import com.primary_lib.LibClass;
var test:LibClass = new LibClass();...

How to include this library into my project and where should I put all those files? I already tried putting them into every possible folder but I always get definition com.primary_lib:LibClass could not be found error.