In order to build Checkstyle Beans from sources you have to do
the following steps. As a prerequisite you also need JDK, Maven 2 and Ant.

1) Download NetBeans 6.5 Beta2 and unzip it.
http://bits.netbeans.org/netbeans/6.0/beta2/zip/

2) Populate Maven repository.
mvn nbm:populate-repository -DnetbeansInstallDirectory=/path/to/netbeans

3) Checkout Checkstyle 4.4
svn co https://checkstyle.svn.sourceforge.net/svnroot/checkstyle/tags/release4_4/checkstyle/ checkstyle-4.4

4) Build it.
cd checkstyle-4.4
ant build.bindist

5) Install checkstyle-all artifact.
mvn install:install-file -DgroupId=checkstyle -DartifactId=checkstyle-all -Dversion=4.4 -Dpackaging=jar -Dfile=./target/dist/checkstyle-4.4/checkstyle-all-4.4.jar

6) Build Checkstyle Beans.
cd /path/to/checkstyle/beans/
mvn clean install package assembly:attached

7) NBM files are available in target directory.
