0.16 isn't even git tagged, let alone in the package repositories. And before you tag, make sure to fix the version in the .pc file, otherwise this BuildRequires won't work (0.15 has a .pc version of 0.14, and the '>= 0.16' part here asks the .pc file for the version of the library -- if you're using qmake, I can help sync up rpm version to library/pc version if you'd like).

Can you please use mb to test build packages with an rpm/ directory before submitting in the future? It'll catch packaging errors like this immediately.

Please ask me or anyone else questions if you run into trouble using it.