You don't specify which hardware platform you're running, but it does
seem as though you're using a locally-compiled version of Ruby. Did
you build the openbase bindings yourself, or get a binary package from
your 3rd-party source? If it's the latter, I'd make sure that they
built their bindings against precisely the same version of the Ruby
dev headers and library as yours.

Aside from that, I'd recommend seriously thinking about moving off OS
X as a production platform for Rails apps -- I still have regular
problems with Bus Errors crashing my ruby processes on Mac OS, even
after building my own Ruby (and all my native extensions) from source.