Does not compile Local Repository - Maven

I am using Maven with Eclipse and I have configured a source repository in the pom.xml. In my .m2 are all the dependencies included jars of other projects that I must use (before they were as lib).

My problem is that it fails to compile in those java classes that refer to class methods included in said jars.

For example:

  

... mundoMundo.java:[586,91] incompatible types: ....

When in the pom file I have something like this:

<dependency> 
  <groupId>es.proyectomundo</groupId> 
  <artifactId>ProyectoMundo</artifactId> 
  <version>1.0</version> 
</dependency> 

Why should the dependencies be in .m2?