[rules-users] Error trying to build Drools 5.0 from source

Anyone know what this means? I downloaded drools-5.0-src.zip from http://www.jboss.org/drools/downloads.html. I extracted it, cded into the top directory and after perusing the README typed $ mvn -Declipse -Ddocumentation clean install The output: [INFO] Scanning for projects... [INFO] ------------------------------------------------------------------------ [ERROR] BUILD FAILURE [INFO] ------------------------------------------------------------------------ [INFO] The projects in the reactor contain a cyclic reference: Edge between 'Vertex{label='org.drools:docbook-xsl-drools'}' and 'Vertex{label='org.drools:docbook-style-drools'}' introduces to cycle in the graph org.drools:docbook-style-drools --> org.drools:docbook-xsl-drools --> org.drools:docbook-style-drools [INFO] ------------------------------------------------------------------------ [INFO] For more information, run Maven with the -e switch [INFO] ------------------------------------------------------------------------ [INFO] Total time: 4 seconds [INFO] Finished at: Wed Oct 07 10:33:21 MDT 2009 [INFO] Final Memory: 10M/80M [INFO] ------------------------------------------------------------------------