Neither Stephan nor I use drupal5 anymore, which means we don't really test stuff all that much.
Does anyone still run it ? It's likely OpenBSD 4.8 will be the last release with actual support. Moving to drupal6, unless you have really specific local development, is possible (a bit painful for views, but fairly easy in most cases). If you really need it, you better step up and volunteer to maintain it, or at least to provide useful patches...