Maven dependency issue - artifact not found in central repo

Maven dependency issue - artifact not found in central repo

I'm trying to build the project from this site
-http://www.joptimizer.com/usage.html. I downloaded the sources jar file,
unpacked it and ran maven package in the root folder. maven fails at the
last minute saying it couldn't resolve the dependency.. could not find
artifact seventytwomiles:architecture-rules:jar:3.0.0-M1 in central repo -
repo.maven.apache.org/maven2 .. I have a feeling I might need to change
some thing in the pom.xml file for this to work, but have no idea what.
Googling for this missing dependency led me no where. In general, how
would one know what to do to handle such errors (and also please help with
this specific case).