In this directory you can place addon modules for OpenSim Each module should be in it's own tree and the root of the tree should contain a file named "prebuild.xml", which will be included in the main prebuild file. The prebuild.xml should only contain <Project> and associated child tags. The <?xml>, <Prebuild>, <Solution> and <Configuration> tags should not be included since the add-on modules prebuild.xml will be inserted directly into the main prebuild.xml