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/usr/include/sage/GLU.h is in libsage-dev 0.2.0-4.1ubuntu1.

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#ifndef SAGE_GLU_H
#  define SAGE_GLU_H 1
#  ifdef __APPLE__
#    include <OpenGL/glu.h>
#  else
#    include <GL/glu.h>
#  endif
#endif