Maven assembly plugin and adding system dependencies to the classpath

I have some dependencies which I am providing myself. The jars are in the resources directory. In my pom they are scoped as system and I include the path to them. However, when I jar things up using the assembly plugin and use

<addClasspath>true</addClasspath>

It doesn't add the path of the system jars. How can I get them to be included automatically?

Thanks

What does the given command do Mvn dependency build classpath?

Description: This goal outputs a classpath string of dependencies from the local repository to a file or log.

What is the use of Maven Assembly plugin?

The Assembly Plugin for Maven enables developers to combine project output into a single distributable archive that also contains dependencies, modules, site documentation, and other files. Your project can easily build distribution "assemblies" using one of the prefabricated assembly descriptors.

Yeah, and that's why using system scope is a bad practice. Have a look at this previous answer (and also this one) for a solution.