I'm clueless... Try that, from a terminal and from inside the Cool VL Viewer directory:
Normally you should get:
If you don't get the above, then you didn't install the viewer correctly.
If you do get the above then post the full output for:
Normally, you should get something like this:
That is, only the X11, OpenGL and GTK+ libraries, as well as libpng and libxml2 are pulled from your distro's.