Running mvn site fails because of bad dependency in cms-prototype

When running from the root project mvn using:
mvn -Dmaven.test.skip=true clean compile site:site
then everything builds fine, but when using:
mvn -Dmaven.test.skip=true clean site:site
then the build failes with the error as pasted below.
The build is done with an empty local maven repository, and when removing the module cms-prototype from addon/pom.xml and application/pom.xml then things run while.
Which leads to the conclusion that somethings amiss with the cms-prototype pom definition.

– error pasted below –

[INFO] Compiling 7 source files to /home/berry/sjakiekonijn-trunk/addon/cms-prototype/frontend/target/classes
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Compilation failure
/home/berry/sjakiekonijn-trunk/addon/cms-prototype/frontend/src/main/java/org/hippoecm/cmsprototype/frontend/plugins/tabs/TabsPlugin.java:[40,45] cannot find symbol
symbol : constructor PluginDescriptor(java.lang.String,java.lang.String,java.lang.String)
location: class org.hippoecm.frontend.plugin.PluginDescriptor

/home/berry/sjakiekonijn-trunk/addon/cms-prototype/frontend/src/main/java/org/hippoecm/cmsprototype/frontend/plugins/tabs/TabsPlugin.java:[40,45] cannot find symbol
symbol : constructor PluginDescriptor(java.lang.String,java.lang.String,java.lang.String)
location: class org.hippoecm.frontend.plugin.PluginDescriptor