Build from source failing

I used <a href="http://continuum.apache.org/development/building.html">link</a> to build the continuum.

cd /path/to/continuum-all/parent
mvn install
This is working fine.

cd /path/to/continuum-all/continuum
mvn install
This is not working as the above checkout is not downloading all (mentioned below) the modules of the continuum.

<!--module>continuum-commons</module>
<module>continuum-distributed</module>
<module>continuum-api</module>
<module>continuum-store</module>
<module>continuum-reports</module>
<module>continuum-core</module>

<module>continuum-notifiers</module>
<module>continuum-test</module>
<module>continuum-webapp</module>
<module>continuum-xmlrpc</module>
<module>continuum-release</module>
<module>continuum-data-management</module>
<module>continuum-docs</module>
<module>continuum-jetty</module>

<module>continuum-buildagent</module>

<module>continuum-builder</module-->

If comment the modules and try to build without them SCM project gives compilation error.