running examples on Ubuntu 13.04 => undefined symbol: gluOrtho2D

Hi,
I built and installed without problem shivaVG on my Ubuntu 13.04,  but I get the following messages when I try running any of the provided examples:
/home/flo/svn/shivavg2/trunk/examples/.libs/lt-test_blend: symbol lookup error: /home/flo/svn/shivavg2/trunk/src/.libs/libOpenVG.so.0: undefined symbol: gluOrtho2D

Any clue?

Thanks,
Flo
