I downloaded the Drools source code (drools-5.0-src.zip) and

I’m trying to build Drools according to the instructions in

the README.txt.

Typing this command:

mvn -Declipse -Ddocumentation clean install

I get this error

[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: 3 seconds

[INFO] Finished at: Tue Sep 15 10:19:49 MDT 2009

[INFO] Final Memory: 10M/81M

[INFO] ------------------------------------------------------------------------

OS: Ubuntu 9.04

JDK: Sun 1.6.14 for x86_64

Maven version: 2.2.1

More generally, is there documentation anywhere about the

build architecture and infrastructure?  It’s my first time trying

Maven.