I have. I wouldn't have posted otherwise. There is no module anywhere to be found. At the very least it should have placed the completed vloopback.ko file in the working directory, but there's nothing. The output I posted is what I get when I try to build it manually, but I've also tried it with the scripts provided by the two projects, and both of them announce failures, because in the end there's no module for them to install.
After posting this I also found that Debian provides an old version (1.1.1) that's supposed to build with module-assistant. But as expected, it fails also. Not that it would do me much good anyway, because the cam projects require a newer modified version.
I'm completely at a loss here. It's not a big compile, being just one .c file and a makefile. But this is way beyond my ability to debug.
And it's rather important that I get this working. The primary reason I bought the cam is because someone I know has asked me if I could provide her with online video lessons.
Oh, and since I failed to post it before, here's the exact kernel version I'm using. It's the stock Debian kernel.
david:[~]$ uname -srvm
Linux 2.6.29-2-686 #1 SMP Sun May 17 17:56:29 UTC 2009 i686