X2go developers can login to:

$ ssh -lx2go-admin -p32032 code.x2go.org

and launch a package build process:

$ x2go-build+upload-package <package-name> {heuler,main}[/{squeeze,wheezy,sid}]

The build server does currently not supported KVM (Kernel based Virtual Machine), thus the build process is quite slow (but works). The real build server currently is ,,Mike's Notebook''.