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This is a rather annoying, but shallow, failure. Dlopen on osx is quite touchy 
about the flags you use to open a shared library.

Anyway, all tests pass on the trunk and 2.5 branch, I guess this was fixed before 
2.5 was released. I have had an e-mail exchange with Thomas Heller about a 
simular issue and he has checked in a fixed for that before 2.5 was released.\

I'm therefore closing this issue.