I tried what you suggested, but my linker is still complaining that it can't find the library.
Here is the command I'm executing:
g++ tb.o trackball.o gldemo.o -o GLdemo -I/usr/include/SDL -L/usr/X11R6/lib -lX11 -lglut -lGL -lGLU -lm -L/home/mike/gl/unix/demo -llibftgl
I'm not sure if I'm even doing this correctly, but the library object is located at /home/mike/gl/unix/demo/libftgl.la. I tried renaming it to libftgl.a, but that didn't work either.