if test -f $k3d_check_opengl_directory/libGL.so || test -f $k3d_check_opengl_directory/libGL.a || test -f $k3d_check_opengl_directory/libGL.dll.a; then
if test -f $k3d_check_openglu_directory/libGLU.so || test -f $k3d_check_openglu_directory/libGLU.a || test -f $k3d_check_openglu_directory/libGLU.dll.a; then