Sorry for my previous empty reply (keyboard clumsiness). Andre Hauptfleisch <ahauptfleisch(a)csir.co.za> writes: Dear Sir, There are actually several versions of Olena available. The version you have tried is the upcoming release 1.0 of Olena, which is currently developed and not really usable; for instance, we haven't ported the image processing algorithms from the previous versions of the library, to Olena 1.0. Unless you're interested by the development techniques (advanced OOP, static genericity, template metaprogramming, etc.) at the heart of Olena 1.0, we advise you to use the previous release, Olena 0.10, which is available here : http://www.lrde.epita.fr/cgi-bin/twiki/view/Olena/Download This release is pretty old, and might not be usable with recent C++ compilers (and recent versions of SWIG, if you had planned to try the Swilena wrappers for Python and Ruby). Fortunately, updated snapshots of Olena 0.10 are available here : http://www.lrde.epita.fr/~levill_r/olena/snapshots/ These snapshots should be fairly usable with modern tools. Thank you for trying Olena! Regards, Roland Levillain