this is a basic MAVEN problem. maven needs all
artifacts(or just jar/war/ear etc. files) to be in the local or global repository before it's able to compile source code which references those artifacts.
I haven't used the mentioned tutorial, so i don't know if it contains steps toe create both the war and ear. However I can help you a bit with Maven (which is my favorite for Seam builds) if you have the files.
Because the artifacts aren't on your local computer or at the global (maven) repository maven advices you to install them manually. You can do it the
maven-wayor use a simple (but very effective) trick.
Under you user-diretory you will find the maven-directory .m2 which has a directory repository. Each artifact's structure is completely mirrorred under that directory.
if you create a directory structure
the x stands for ear or ejb (meaning you have to create two subdirectoris under ./seam) and drop your ear and jar there, the next time you start the build, maven will find the artifacts and compile without problems.
NOTE: If you HAVE the build files for these artifacts, build them first with Maven, because that's the most logic sequence.
If you want to know more from Maven, buy the Maven: definitive guide from O'Reilly as far as I know the best guide.