thanks for the various messages none of which solved the problem. I had
a look to see what cmake was actually doing, and in 

  /usr/share/cmake-2.6/Modules/FindOpenGL.cmake

I found the lines:

      FIND_LIBRARY(OPENGL_gl_LIBRARY
      NAMES GL MesaGL
      PATHS /opt/graphics/OpenGL/lib
            /usr/openwin/lib
            /usr/shlib /usr/X11R6/lib
      )

So I looked in /usr/X11R6/ and found that lib was empty and that
include was symbolically linked to ../include. As a result of this I
took the following steps to fix the problem:

  cd  /usr/X11R6
  sudo rmdir lib
  sudo ln -s ../lib
  cd lib
  sudo ln -s libGL.so.1 libGL.so

Obviously, don't do this unless you know what you are doing!

I'm not sure how this problem has arisen; but at least I now have a
working hugin 3850.

        Peter.


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