Looks like an interesting module.
> that I have a video input. However, I don't have things like make or gcc on
> the VM so I can't compile it directly on the VM. I thought I might be able
> to get them on there by using the Terminal IDE app, but that errors
> (
https://code.google.com/p/terminal-ide/issues/detail?id=15).
>
> To begin with I could do with some advice on what sort of approach I should
> be taking.
>
> Is there a mechanism for adding the v4l2loopback code into the source tree
> then re-compiling the whole Android-x86 system?
There is a way to build external module into the android-x86 image.
Search the forum for it.
> Failing that, how could I get make and gcc onto Android?
No need.
If you never build the android(-x86) source,
read the GetSource page first.