so little linux stuff on site except the lessons especially I miss a lesson that covers dragging.zip so much *.exe in downloads section.. even though I don't think I understood all the GL features but this dragging stuff .. should be the next thing i learn .. any advice? yes please ..

By dragging do you mean using the mouse to move objects on the screen? Although its not covered directly, check the tutorial on picking (selecting 3d objects). You should be able to modify it to do what you need.

While linux is not directly covered by the tutorials, you should be able to piece together how a context is setup from the tutorial ports (at the bottom of every tutorial). SDL's documentation should also help you setup a rendering context for OpenGL. Once you have a context you will be able to use OpenGL as you do in Windows (just without the Win32 calls).