See video on
http://www.youtube.com/watch?v=nwmWXce--2Y∞ for video instructions, and short demo.
Download
Get it by svn. Whip up a terminal and run
svn co https://fxsdk.svn.sourceforge.net/svnroot/fxsdk/screenstreamer/trunk screenstreamer --revision 23
where you want to put the source directory. This can take some seconds.
Compilation
You need Qt, libusb 1.0 or greater, and the usual development tools. Enter the directory you grabbed by svn (screenstreamer), and run:
qmake
make
The executable can be run with
./screenstreamer. You might need root permissions.