Hi Georg and Christoph,
I'll try to rebuild Georg's SystemCommand module (you uploaded the source code did you). It has not been included in this version because the same functionality (execution of external processes) is being implemented on the platform and will be available in the next version, along with a new module security scheme.
I'd also like a repository with automatic building functionality; that would be really great! But, how? I have what I have (and you'd be surprised if you'd know the 'speed' of my Internet connection, for example).
So, for now, we have a unique and fantastic automatic repository: Juan. Its only drawback is that it's a bit slow, but he is definitely your best option

Other than the obvious problem to build on different platforms, this is the last time that you have to recompile a PixInsight module (unless something catastrophic happens). The new PCL guarantees that.
As a side note, with VMware --which is really cheap for what it offers-- you can build modules on all PixInsight platforms except Mac OS X. If you want to use a free virtualization tool, you have VirtualBox, although its performance isn't comparable (and it lacks support for FreeBSD completely).