BUILDSTDERR: Unhandled Exception: BUILDSTDERR: System.TypeInitializationException: The type initializer for 'System.Random' threw an exception. ---> System.DllNotFoundException: System.Native assembly:<unknown assembly> type:<unknown type> member:(null)
This looks similar to an issue I had when I was trying to use the Linux class libraries inside Wine. One of the changes brought in by our merge from upstream Mono is that the class libraries are now platform-specific.
I'm not sure why the error is happening in the build process.
And yes, the network shouldn't be used here. It only attempts that because the included monolite failed. The tarballs should be sufficient for a successful build.