I've done some tests and what I've determined is that prawn 2.2.2 is incompatible with pdf-core 0.8.1. These gems are extremely tightly coupled because they're essentially one library. Thus, I think it's a mistake for Fedora to be packaging pdf-core 0.8.1 at this time. It should either wait for the next release of Prawn or package the prerelease from master (which is tested against pdf-core 0.8.1).

Best Regards,

-Dan

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